Silica sand turf infill is bought by the tonne, and that is where the trouble starts. Buyers compare quotes by price per tonne and discover a season later that fines and moisture, not price, decided how the field played. Neither factor appears on the quotation – they live on the spec sheet, the wash test and the delivery paperwork.
We sit on the carpet side of this purchase – turf rolls are what we build – and the same sand question has reached us for years. This guide is written from that seat: what belongs on the spec sheet, what gets checked when the load arrives, and what to settle before you sign. Every step closes on a document you can file.
Silica Sand Turf Infill Is a Spec, Not a Commodity
Graded silica sand turf infill is a manufactured product wearing a commodity costume. The scale is wide: per USGS, silica covers five categories, and industrial sand and gravel alone serves uses from glassmaking to filtration. At the top of that range sits high-purity quartz, defined as under 100 ppm total impurities – at least 99.99 percent silica. A word that stretches that far describes a family, not a specification.
The practical consequence is that every load should arrive against a written specification, not a trade name. A spec sheet turns a pile of sand into measurable lines: a gradation curve, a chemistry sheet, a cleanliness figure and a grain shape description. Each line has a standard test behind it, and each test produces a number you can compare between suppliers.
For background on why sand sits in the system in the first place, the linked overview covers the mechanism – this page stays on the purchase itself. The mechanism does not help you compare two deliveries. Specs and paperwork do.
Spec, not scenery. Sand marketed as play sand, beach sand or arena sand is not automatically infill sand. Per the Wisconsin Geological and Natural History Survey, sand from most beach and riverbank deposits is too impure and too angular for demanding industrial uses. A written spec is how that caution reaches the purchase order.
A spec also changes who carries the risk. When the sheet names the test method, the sieve standard and the chemistry, a short delivery is a claim with paper behind it. When it names nothing, a short delivery is an argument with no referee. That is worth more than any discount per tonne.
The Spec-Sheet Checklist: Grading, Purity, Fines and Grain Shape
Every line on a sand spec sheet exists because someone once received a load without it. Grading, purity, fines and grain shape are the four lines that decide how silica sand turf infill behaves after the bags are cut. Ask for each as a measured value with a test method named, never as an adjective.
Grading
Grading is the spread of particle sizes, measured by sieving – per the ASTM C136 test method, sieve analysis determines the particle size distribution of fine and coarse aggregates. Its results are used to determine compliance of particle size distribution with specification requirements, which makes gradation a contract-checkable quantity rather than a verbal claim. Mesh numbers only become comparable when anchored to a standard designation: the same method identifies sieve size by its designation in Specification E11. So ask which sieve standard a supplier’s mesh refers to, and what passes each screen.
Purity
Purity is a gr