{"id":5779,"date":"2026-10-13T09:51:57","date_gmt":"2026-10-13T09:51:57","guid":{"rendered":"https:\/\/www.relyirgrass.com\/which-size-infill-need-artificial-turf-project\/"},"modified":"2026-11-09T09:24:20","modified_gmt":"2026-11-09T09:24:20","slug":"which-size-infill-need-artificial-turf-project","status":"publish","type":"post","link":"https:\/\/www.relyirgrass.com\/de\/which-size-infill-need-artificial-turf-project\/","title":{"rendered":"Kunstrasen-F\u00fcllmaterial: Kleine Linie, gro\u00dfe Folgen"},"content":{"rendered":"<style>\nh2 { font-size: 1.6em; line-height: 1.3; margin: 40px 0 18px; }\nh3 { font-size: 1.2em; line-height: 1.35; margin: 26px 0 12px; }\np { line-height: 1.8; margin-bottom: 28px; }\ntable { display: table !important; width: 100% !important; border-collapse: collapse; margin-bottom: 28px; }\nth { text-align: left; padding: 12px 14px; background: #1a5c2e; color: #ffffff; font-weight: 600; }\ntd { padding: 12px 14px; border-bottom: 1px solid #e5e5e5; vertical-align: top; }\nfigcaption { text-align: center; font-style: italic; }\n.callout-note { border-left: 4px solid #1a5c2e; background: #f3f7f2; padding: 18px 22px; margin: 28px 0; border-radius: 4px; }\n.callout-warning { border-left: 4px solid #b8860b; background: #fdf7e8; padding: 18px 22px; margin: 28px 0; border-radius: 4px; }\n.callout-tip { border-left: 4px solid #2e7d32; background: #f0f7f0; padding: 18px 22px; margin: 28px 0; border-radius: 4px; }\n<\/style>\n<p>The order sheet for a turf project runs long, yet its shortest line starts the most arguments. Buyers describe ordering &#8216;sand&#8217; by name alone and discovering the surface plays completely differently from the sample &#8211; same carpet, two grades, two fields. That gap is why the infill size for artificial turf deserves treatment as a specification decision, not a bag label.<\/p>\n<p>We build carpet, so we watch that line from the roll side, and the pattern repeats every season. One careless order line can cost a project its whole playing window, because the grade was written from habit while the specification was read closely everywhere else. Grain size reads like the smallest technicality on the sheet, and it quietly decides how the surface drains, cushions and wears. This guide is the decision tree for that line &#8211; the sizes, the bands behind them, and the checks that keep the choice honest.<\/p>\n<h2 id=\"order-line\">The Line Everyone Fills In Without Asking<\/h2>\n<p>On most order sheets the infill size for artificial turf is one short field, and it is the line buyers complete from habit rather than from a document. The word &#8216;sand&#8217; carries an illusion of sameness, as if all grades were interchangeable bags of the same stuff. Suppliers of industrial sand work to the opposite reality &#8211; the United States Geological Survey notes that processors turn out many grades to meet specifications for virtually any use.<\/p>\n<p>The habit survives because the field looks self-explanatory and because nobody wants another agenda item. The cost of that comfort lands later, in how the surface plays and drains. By then the carpet is down, the fill is spread, and a correction means opening a finished project. The paper trail rarely catches up with the mistake before the grass is down.<\/p>\n<div class=\"callout callout-note\">\n<p><strong>Order-line rule.<\/strong> The grade travels with the carpet specification and the scene, never ahead of them. A size written into the order before either is read is a guess with a delivery date attached. There is a structural reason the line slips, too. The carpet and the fill usually travel separate supply chains, so the grade gets written where the turf specification is not being read. <\/p>\n<p>Per the Synthetic Turf Council, most synthetic turf sports fields in the United States run on infill re-processed from used tires. The council counts more than 12,000 such fields, which makes tire-derived grain the country&#8217;s default fill. A recycled material arrives with batch-to-batch spread, and the spread is exactly what the order line needs to pin down.<\/p>\n<\/div>\n<p>The spread is not hypothetical. Per the EPA federal research plan, tire crumb infill from American fields ran predominantly between 0.25 and 4 mm, with wide variability. Two fields supplied under the same bag name can therefore sit far apart inside that one span. Before the grade is written, it pays to see <a href=\"https:\/\/www.relyirgrass.com\/artificial-turf-infill-why-fake-grass-need\/\">why the infill layer decides how the surface behaves<\/a> &#8211; that page takes the layer&#8217;s point of view. This page stays with the order: which size goes on the line, and how the choice gets verified.<\/p>\n<h2 id=\"grade-vs-spec\">Reading Particle Size Against Your Turf Specification<\/h2>\n<p>Matching the infill size for artificial turf to a project starts with the carpet, not with the fill aisle. Pile height, density and yarn shape describe the structure the grain has to live in. The FIFA Quality Programme handbook treats them accordingly, listing free pile height and infill depth as separate system parameters under Test Methods 18 and 21.<\/p>\n<h3>What the Carpet Brings to the Decision<\/h3>\n<p>A taller, denser carpet leaves different inter-row space than a short, tight one, and yarn morphology changes how the fill sits and locks. That is why the same grade reads differently in two carpets. Two carpets with the same pile height can still treat a grain differently once shape and density are read. The turf specification is the first document to open, because the grain must fit the structure that is actually being bought. Fibre density also decides how much grain the structure can accept before the spaces between yarns close up, which is a limit the bag cannot see.<\/p>\n<p>Yarn shape adds its own wrinkle. A flat, wide tape presents different packing behaviour than a stemmed or texturized fibre, and the same grain reads differently against each. This is one more reason the carpet specification, not the fill catalogue, opens the reading.<\/p>\n<p>Depth belongs to a different conversation. The handbook&#8217;s separation of pile height from infill depth is the formal version of a practical rule. Size is chosen for the structure, depth is set for the performance target, and the two are verified by different tests.<\/p>\n<h3>The Language the Numbers Speak<\/h3>\n<p>Serious spec sheets answer with two letters &#8211; d and D, the lower and upper ends of the declared band. The letters only mean something when a test method stands behind them. Sieve designations and millimetre ranges describe the same physical spread, and a buyer who can read one can read them all. Per the EPA federal research plan, characterisation of field infill ran by sieving, seven fractions per sample, from 0.063 mm up past 4.75 mm. A single number on a bag is a summary of a distribution, and the distribution is what a buyer can actually verify.<\/p>\n<p>Geology keeps the formal vocabulary &#8211; <a href=\"https:\/\/pubs.usgs.gov\/ds\/350\/ds350.pdf\" target=\"_blank\" rel=\"noopener\">per the USGS Wentworth grain-size scale<\/a>, what a geologist calls sand is a family of sizes from 0.0625 mm to 2 mm wide. Everyday language flattens that family into one word. The flattening is where careless order lines begin.<\/p>\n<p>Sand for turf is an industrial product, graded to a specification before it ever reaches a field. <a href=\"https:\/\/www.relyirgrass.com\/silica-sand-artificial-turf-infill-buyer-s-guide\/\">How silica sand is graded before it ever meets turf<\/a> is the supply-side companion to this section. Between the quarry sieve and the project sieve sits a chain of grades, and every link can be documented.<\/p>\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" style=\"width:100%;height:auto;border-radius:8px\" src=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1.webp\" alt=\"Hands pouring fine sand in a stream against warm light\" width=\"1200\" height=\"676\" class=\"wp-image-5761\" data-img-slot=\"1\" loading=\"eager\" srcset=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1.webp 1200w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1-300x169.webp 300w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1-1024x577.webp 1024w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1-768x433.webp 768w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot1-18x10.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><figcaption>Grain size is a hand-scale fact first: run it through your fingers before it reaches the order line.<\/figcaption><\/figure>\n<h2 id=\"size-bands\">Size Bands and the Layered Fill<\/h2>\n<p>Read closely, the infill size for artificial turf is never one number but a band, and serious projects often stack two bands in layers. Geology supplies the vocabulary &#8211; the classes below, per the USGS Data Series table, are the boundaries that turf spec sheets borrow. When a spec sheet declares a band, those edges are what the delivery will eventually be judged against.<\/p>\n<p>Bands also survive time better than single numbers do. Infill migrates, compacts and gets topped up across a service life, and every top-up must re-enter a moving system. A declared band gives the maintenance crew a target that can be re-checked years later; a bag nickname gives them nothing to check against. That is the quiet argument for insisting on d and D even on modest projects.<\/p>\n<table>\n<thead>\n<tr>\n<th>Millimeters (mm)<\/th>\n<th>Wentworth size class<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>2<\/td>\n<td>Very coarse sand<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>Coarse sand<\/td>\n<\/tr>\n<tr>\n<td>0.5<\/td>\n<td>Medium sand<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>Fine sand<\/td>\n<\/tr>\n<tr>\n<td>0.125<\/td>\n<td>Very fine sand<\/td>\n<\/tr>\n<tr>\n<td>0.0625<\/td>\n<td>Coarse silt<\/td>\n<\/tr>\n<tr>\n<td>0.031<\/td>\n<td>Medium silt<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Two observations make the layered approach concrete. Per the EPA federal research plan, the sand inside field infill typically sat in material retained on a 0.25 mm No. 60 sieve. The rubber component spread across much larger sizes, so the two materials occupy different magnitude ranges in one profile. Even fresh tire crumb from recycling plants averaged mostly in the 1 to 2 mm fraction per the same research, with smaller shares either side.<\/p>\n<p>Layering formalises that split. Under the FIFA Quality Programme handbook, stabilising infill and performance infill are specified as separate components. Each is accepted by Test Method 20 against its own declared band, with shape held to a similar-shape requirement. Two bands, two declarations, one test method &#8211; that is how a layered system stays auditable.<\/p>\n<p>The acceptance logic is band-shaped too. The same handbook allows a maximum deviation of one sieve step from the declared grading. It also requires 60 percent of the sample mass to sit between d and D. That is the certification world saying quietly what this page argues loudly &#8211; a grade is a band with edges, and the edges are testable.<\/p>\n<h2 id=\"scene-demands\">What Each Application Demands From the Grain<\/h2>\n<p>The workable infill size for artificial turf changes with the scene, because each application loads the grain differently. Buyers in every sand-using industry learn this the same way. The Oklahoma Geological Survey frames it plainly: small fractures require smaller sand grain sizes, and large fractures require larger ones. It calls applying the right grain size critical when sand works as a filtering medium. The lesson travels across industries unchanged &#8211; the use decides the size, never the other way round.<\/p>\n<p>Turf is no exception &#8211; the grain is asked to hold blades upright, accept load, drain water and resist migration, and scenes weight those duties differently. A back garden and a seven-a-side pitch can carry the same word on the bag while needing different bands entirely.<\/p>\n<p>Two practical constraints sharpen the weighting further. Maintenance ambition decides how much migration the surface will be allowed to live with, and usage hours decide how much load the grain must shrug off. Both constraints are cheap to ask about and expensive to discover late. A scene question that never reaches the spec sheet still ends up expressed in the grain.<\/p>\n<figure>\n<img decoding=\"async\" style=\"width:100%;height:auto;border-radius:8px\" src=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2.webp\" alt=\"Eroded cliff face showing natural horizontal layering\" width=\"1200\" height=\"800\" class=\"wp-image-5762\" data-img-slot=\"2\" loading=\"lazy\" srcset=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2.webp 1200w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2-300x200.webp 300w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2-1024x683.webp 1024w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2-768x512.webp 768w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot2-18x12.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>The column works in bands &#8211; coarse below, finer above &#8211; and each band inherits its own tolerance.<\/figcaption><\/figure>\n<p>Weighted by scene, the demands read like this.<\/p>\n<ul>\n<li><strong>Lawns and gardens.<\/strong> The grain mainly props blades and moves rain away, with modest elastic duty and light maintenance expectations.<\/li>\n<li><strong>Playgrounds.<\/strong> Impact behaviour and cleanliness dominate the conversation, and the fill must survive raking and top-ups without dusting.<\/li>\n<li><strong>Putting greens.<\/strong> Roll consistency tolerates almost nothing, so the band stays tight and grooming is constant.<\/li>\n<li><strong>Sport fields.<\/strong> Where certification systems apply, the band is declared as d and D and accepted by test method rather than by eye.<\/li>\n<\/ul>\n<p>None of these rows names a number, and that is deliberate &#8211; the number belongs to the specification chain, not to a scene stereotype. What the scene fixes is the weighting. Once the weighting is honest, the band follows from the carpet and the performance target instead of from habit. A scene can also disqualify a habit &#8211; what worked on the last project is evidence, not a specification.<\/p>\n<h2 id=\"mismatch\">When the Grade Is Wrong: How Mismatch Shows Up<\/h2>\n<p>A wrong infill size for artificial turf rarely announces itself on installation day. It shows up weeks later, as behaviour the specification never promised. The two classic failures travel in opposite directions &#8211; fines that migrate and crust at the surface, and coarse grains that never lock the carpet in place. Neither failure is visible in a photo of a finished field, which is why both keep surprising buyers.<\/p>\n<p>Fines deserve the sharper warning, because &#8216;fine&#8217; is a graded word with a regulated meaning. Dust severity has a formal yardstick. <a href=\"https:\/\/www.osha.gov\/silica\" target=\"_blank\" rel=\"noopener\">Per OSHA crystalline silica guidance<\/a>, the particles that drive dust disease are at least 100 times smaller than ordinary sand on beaches and playgrounds.<\/p>\n<p>Field data keeps the proportions honest too. The EPA research found material below 0.063 mm present consistently in field infill, but at low levels. A minor fraction, with outsized importance for exposure questions.<\/p>\n<div class=\"callout callout-warning\">\n<p><strong>Mismatch rule.<\/strong> Both failure directions stay quiet at handover and get loud by mid-season. Fines compact, crust and slow drainage; coarse grains displace and leave the carpet standing proud and unsupported. Judge the grade by behaviour at retest, not by the bag.<\/p>\n<\/div>\n<h3>Performance and drainage feel it too<\/h3>\n<p>Performance mismatch is just as measurable. A University of Tennessee study presented through ISEA held installation depth constant at 35 mm across three different infills. It still found particle size and distribution playing a key role in 3G field performance. Same depth, different grain, different field &#8211; the grade is not a footnote to depth, it is a parallel variable.<\/p>\n<p>The direction of that sensitivity is documented too. A peer-reviewed Korean study found the lead ingestion hazard quotient more than twice as high in crumb rubber fractions below 250 microns as above. Smaller grain, higher exposure reading &#8211; fine is a measurable shift in behaviour, not a mood. None of this argues against fine grades; it argues for knowing which fine grade the scene can live with.<\/p>\n<p>Drainage is where mismatch turns structural. The FIFA handbook requires water permeability of at least 180 mm\/h for certified fields. A grade that clogs or locks up puts that number at risk, however good the carpet looks. The grade, in other words, is part of the drainage design, not an afterthought beside it. Depth is the other lever beside the grade &#8211; <a href=\"https:\/\/www.relyirgrass.com\/calculating-how-much-artificial-turf-infill-need-guide\/\">how depth and quantity interact with the grade you choose<\/a> is the arithmetic companion to this page.<\/p>\n<div class=\"cta-box\" style=\"background-color:#1a2b3c;border-radius:6px;padding:30px;margin:35px 0\">\n<h3 style=\"color:#ffffff;margin-top:0\">Confirming the Band With the Carpet?<\/h3>\n<p style=\"color:#ffffff\">Rolls built to your spec: pile height, density and yarn morphology configured for your grade band, samples sent for trial-fill first.<\/p>\n<p><a href=\"https:\/\/www.relyirgrass.com\/artificial-grass-products\/artificial-grass-roll\/\" style=\"display:inline-block;background-color:#1a5c2e;color:#ffffff;padding:12px 24px;border-radius:4px;text-decoration:none;font-weight:600\">View Artificial Grass Rolls<\/a><\/p>\n<\/div>\n<h2 id=\"four-checks\">Four Checks Before You Commit to a Grade<\/h2>\n<p>Handled as procurement, the infill size for artificial turf survives four checks before anyone signs. Three of them happen around the paperwork, and the last one is the paperwork itself. Each check exists because somebody, somewhere, skipped it. None of the four needs a laboratory on site; three of them are questions asked at the right moment.<\/p>\n<h3>Ask for the Sieve Curve<\/h3>\n<p>A declared band is a claim until it is tested. Granular infill has a dedicated method for exactly this &#8211; <a href=\"https:\/\/www.astm.org\/get-involved\/technical-committees\/committee-F08\/subcommittee-F08\/jurisdiction-F0865\" target=\"_blank\" rel=\"noopener\">per ASTM F3846 sieve analysis standard<\/a>, the material is sieved and graded the way the declaration assumes. Ask the fill supplier for the gradation result against the declared d and D, and file it with the project documents. <\/p>\n<p>A curve cannot be argued with later; a memory of a conversation can. A curve also shows the tails, where the trouble usually lives &#8211; the fines that dust and the coarse end that migrates. One number hides both.<\/p>\n<h3>Verify What Actually Arrived<\/h3>\n<p>Delivery and specification are different addresses. In-situ material can be sampled at full depth and graded, per the ASTM F3640 field sampling method, so acceptance does not have to trust the ticket. The FIFA retest convention carries the same logic on site. Grading is checked there, with the largest sieve retaining at least 10 percent of the mass recorded, to ensure coarser infill has not been installed. Acceptance written this way survives a change of contractor; acceptance written as a nickname does not.<\/p>\n<h3>Keep a Sealed Reference Sample<\/h3>\n<p>Disputes about a grade are settled by comparison, and comparison needs a reference. Keep a sealed sample from the delivered lot, labelled against the order line, so any later question has something physical to answer with. ASTM&#8217;s own announcement for its turf infill standards names three users &#8211; manufacturers before sale, specifiers writing requirements, and purchasers testing what was installed. Every party keeping evidence is the standard-bodied version of this check.<\/p>\n<figure>\n<img decoding=\"async\" style=\"width:100%;height:auto;border-radius:8px\" src=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b.webp\" alt=\"Nested test sieves holding sorted granular fractions on a laboratory bench\" width=\"1200\" height=\"802\" class=\"wp-image-5774\" data-img-slot=\"3\" loading=\"lazy\" srcset=\"https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b.webp 1200w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b-300x201.webp 300w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b-1024x684.webp 1024w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b-768x513.webp 768w, https:\/\/www.relyirgrass.com\/wp-content\/uploads\/2026\/10\/which-size-infill-need-artificial-turf-project-slot3b-18x12.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>A sieve stack sorts the delivered load into fractions &#8211; the curve, not the bag wording, settles the grade.<\/figcaption><\/figure>\n<h3>Write It Into the Order Sheet<\/h3>\n<p>The fourth check is the order sheet itself. Write the declared band, the test method and the reference sample into the grade on the order sheet, exactly the way architects and engineers write components into project specifications. A band that lives only in an email thread is an opinion; a band on the order sheet is a parameter someone can test against. None of the four checks costs more than an email, and together they are the difference between a parameter and a promise.<\/p>\n<h2 id=\"whole-purchase\">From Particle Size to the Whole Purchase<\/h2>\n<p>A grade decision reaches further than its one-line field suggests. It hooks into the carpet specification through pile height and yarn morphology, drains into surface performance, and crosses every scene constraint the project carries. Widths, backing and even yarn colour are easy to change at order time; a grade locked in wrong is not. Manage the band as a procurement parameter of equal rank to the carpet itself, and the rest of the order lines up around it. The carpet sets the envelope; the grade fills it; the scene decides what filling well means.<\/p>\n<p>Our <a href=\"https:\/\/www.relyirgrass.com\/artificial-grass-products\/artificial-grass-roll\/\">artificial grass rolls built around your grade band<\/a> are the carpet side of that equation. They come in 2 m, 4 m and 5 m standard widths, with custom sizes cut to the project. Each is built to the pile height, density and yarn morphology the band assumes. A sample in hand is where a trial-fill actually happens &#8211; fill planned against the carpet itself, not against a datasheet memory. Fill planning is advised alongside the sample visit, so the band and the carpet leave the table agreed.<\/p>\n<p>Every large purchase keeps one line that quietly sets the terms for the rest. The infill size for artificial turf is the smallest field on the order and the one that touches the most &#8211; carpet, performance, scene and acceptance all lean on it. Read it last, write it deliberately, and test it like the parameter it is. Treat it with the same care as pile height or fibre choice, and the surface you walk in spring is the one you specified on paper.<\/p>\n<p><!-- relyirgate:C1 --><\/p>\n<h2 id=\"frequently-asked-questions\">Frequently Asked Questions<\/h2>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #1a5c2e;border-radius:4px;padding:25px;margin-bottom:18px\">\n<h3 style=\"color:#1a5c2e;margin-top:0\">Does the infill size for artificial turf really matter if the material is the same?<\/h3>\n<p>Yes &#8211; size changes how the same material behaves. Per the EPA federal research plan, tire crumb infill from American fields ran predominantly between 0.25 and 4 mm, with wide variability. The grade still separated fields held to the same depth.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #1a5c2e;border-radius:4px;padding:25px;margin-bottom:18px\">\n<h3 style=\"color:#1a5c2e;margin-top:0\">What do d and D mean on an infill spec sheet?<\/h3>\n<p>They are the declared lower and upper bounds of the particle size band. Under the FIFA handbook convention, grading may deviate by a maximum of one sieve step, with 60 percent of sample mass between d and D.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #1a5c2e;border-radius:4px;padding:25px;margin-bottom:18px\">\n<h3 style=\"color:#1a5c2e;margin-top:0\">Can I use one grade for both layer and surface?<\/h3>\n<p>Specified systems usually do not. The FIFA handbook treats stabilising infill and performance infill as two separately controlled components, each accepted by Test Method 20 against its own declared band.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #1a5c2e;border-radius:4px;padding:25px;margin-bottom:18px\">\n<h3 style=\"color:#1a5c2e;margin-top:0\">How do I check the infill that was actually installed?<\/h3>\n<p>Sample the field and sieve it. ASTM F3640 covers full-depth sampling of in-situ infill, and the F3846 sieve analysis standard grades what you recover against the declaration.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #1a5c2e;border-radius:4px;padding:25px;margin-bottom:18px\">\n<h3 style=\"color:#1a5c2e;margin-top:0\">Who decides the right size for my turf?<\/h3>\n<p>The project side does &#8211; the spec writer or owner, working from the carpet specification and the scene. The roll supplier configures the carpet to that band and sends samples for trial-fill before the order.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"Article\",\n \"headline\": \"Which Size of Infill Do I Need for My Artificial Turf Project?\",\n \"description\": \"Grade bands, layered fill, scene constraints and four pre-order checks - how to pick the infill size your turf project actually needs.\",\n \"author\": {\"@type\": \"Organization\", \"name\": \"Relyir Artificial Grass\"},\n \"publisher\": {\"@type\": \"Organization\", \"name\": \"Relyir Artificial Grass\"},\n \"datePublished\": \"2026-10-13\",\n \"dateModified\": \"2026-10-13\",\n \"mainEntityOfPage\": \"https:\/\/www.relyirgrass.com\/which-size-infill-need-artificial-turf-project\/\"\n}<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does the infill size for artificial turf really matter if the material is the same?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes - size changes how the same material behaves. Per the EPA federal research plan, tire crumb infill from American fields ran predominantly between 0.25 and 4 mm, with wide variability. The grade still separated fields held to the same depth.\"}}, {\"@type\": \"Question\", \"name\": \"What do d and D mean on an infill spec sheet?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"They are the declared lower and upper bounds of the particle size band. Under the FIFA handbook convention, grading may deviate by a maximum of one sieve step, with 60 percent of sample mass between d and D.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use one grade for both layer and surface?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Specified systems usually do not. The FIFA handbook treats stabilising infill and performance infill as two separately controlled components, each accepted by Test Method 20 against its own declared band.\"}}, {\"@type\": \"Question\", \"name\": \"How do I check the infill that was actually installed?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Sample the field and sieve it. ASTM F3640 covers full-depth sampling of in-situ infill, and the F3846 sieve analysis standard grades what you recover against the declaration.\"}}, {\"@type\": \"Question\", \"name\": \"Who decides the right size for my turf?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The project side does - the spec writer or owner, working from the carpet specification and the scene. The roll supplier configures the carpet to that band and sends samples for trial-fill before the order.\"}}]}<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"definition\": \"The infill size for artificial turf is chosen as a band, not a number: it is read against the carpet specification (pile height, density, yarn morphology), weighted by the demands of the scene, stacked as layered stabilising and performance fills where systems require it, and verified by sieve testing before and after installation.\",\n \"key_facts\": [\n  \"Per the EPA federal research plan, tire crumb infill from American fields ran predominantly between 0.25 and 4 mm, with wide variability\",\n  \"Per the USGS Wentworth grain-size scale, sand is a family of sizes from 0.0625 mm to 2 mm, not a single size\",\n  \"The FIFA Quality Programme handbook accepts infill grading by Test Method 20, allowing a maximum deviation of one sieve step from the declared band, with 60 percent of sample mass between d and D\",\n  \"Per OSHA crystalline silica guidance, the particles that drive dust disease are at least 100 times smaller than ordinary beach and playground sand\",\n  \"Per the ASTM F3846 sieve analysis standard and the F3640 field sampling method, declared grades can be verified before and after installation\"\n ],\n \"qa_concise\": [\n  {\"q\": \"Does the infill size for artificial turf really matter if the material is the same?\", \"a\": \"Yes - size changes how the same material behaves, and the EPA research found field infill spanning 0.25 to 4 mm with wide variability.\"},\n  {\"q\": \"What do d and D mean on an infill spec sheet?\", \"a\": \"They are the declared lower and upper bounds of the particle size band, with 60 percent of the mass required to sit between them under the FIFA convention.\"},\n  {\"q\": \"Who decides the right size for my turf?\", \"a\": \"The project side does, working from the carpet specification and the scene; the roll supplier configures the carpet to that band and sends samples.\"}\n ]\n}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Das Bestellformular f\u00fcr ein Kunstrasenprojekt ist lang, doch seine k\u00fcrzeste Zeile l\u00f6st die meisten Diskussionen aus. K\u00e4ufer berichten, dass sie \u2018Sand\u2019 allein beim Namen bestellen und dann feststellen, dass die Spielfl\u00e4che v\u00f6llig anders spielt als die Musterprobe \u2013 derselbe Teppich, zwei Qualit\u00e4tsstufen, zwei Betreiber. Genau diese L\u00fccke ist der Grund, warum die F\u00fcllgranulatgr\u00f6\u00dfe f\u00fcr Kunstrasen als \u2026 behandelt werden verdient. <a title=\"Kunstrasen-F\u00fcllmaterial: Kleine Linie, gro\u00dfe Folgen\" class=\"read-more\" href=\"https:\/\/www.relyirgrass.com\/de\/which-size-infill-need-artificial-turf-project\/\" aria-label=\"Mehr Informationen \u00fcber F\u00fcllmaterialgr\u00f6\u00dfe bei Kunstrasen: Kleine Menge, gro\u00dfe Folgen\">Weiterlesen<\/a><\/p>","protected":false},"author":2,"featured_media":5760,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"Which Infill Size for Artificial Turf? 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