Shock Pad Buyer's Guide: How to Specify, Verify and Compare Suppliers

Why shock pad purchases go wrong

A shock pad is a low-cost component in a high-cost installation. It is usually 5–15% of the project value, which is exactly why it gets the least scrutiny — and why a bad choice is expensive to reverse once the turf is down and the infill is in.

Three failures account for most of the damage:

• Buying on thickness alone. Two pads at 30 mm can behave completely differently if the density and drainage geometry differ. Millimetres are easy to compare and tell you almost nothing.
• Comparing quotations that are not comparable. Price per square metre means different things depending on whether the supplier counted the sheet's overall size or its effective coverage, and whether the price is FOB, CIF or delivered.
• No evidence. The datasheet says 30 mm and a density figure. Nobody asked which test method produced it, or whether the number is a batch average or a design target.

The six documents to demand before you compare prices

Ask every supplier for these. A supplier who can answer all six is not necessarily the cheapest — but a supplier who cannot answer them is a risk you cannot price.

How to read a shock pad datasheet

A datasheet is a marketing document until you check three things.

Is there a test method next to each number? "Tensile strength: 0.4 MPa" is a claim. "Tensile strength 0.4 MPa (EN 12230)" is a specification. Without the method, the number cannot be reproduced or compared.

Is it a guarantee or a typical value? Suppliers mix these freely. A "typical value" is what the product usually does; a guaranteed minimum is what the supplier will stand behind when a shipment is disputed. Ask which one you are being given, and get the answer in writing.

Does the scope match your project? A property tested on one thickness, density or colour does not automatically apply to another. For standards-tied properties — anything under EN 1177, ASTM F1292 or EN 15330-4 — the performance is tied to the exact tested configuration.

The coverage trap: overall size vs effective coverage

This is the most common way two quotations for the same product end up 5–8% apart, and it is almost never explained to the buyer.

An interlocking sheet has two different areas:

• Overall size — the sheet as it comes off the pallet, edge to edge
• Effective coverage — the area it actually covers once the interlocking edges are engaged and overlapped

Using our own standard interlocking sheet as the worked example:

If a supplier quotes $6.00/m² on overall size and another quotes $6.38/m² on effective coverage, they are quoting the same price — the first number just looks cheaper. At 2,000 m² that invisible difference is roughly 126 m² of pad, or about two extra pallets.

How to neutralise it: state in your RFQ that all prices must be quoted per square metre of effective coverage, and require the supplier to state the effective coverage per sheet. Then the quotations are comparable and the trap disappears.

Freight: why foam is a volume business, not a weight business

This is the part buyers most often miss, and it can be larger than the gap between two suppliers' FOB prices.

Closed-cell XPE foam is light. A 30 mm pad at roughly 105 kg/m³ weighs about 3.2 kg per square metre. A 20-foot container carries roughly 28 tonnes of payload and roughly 33 m³ of volume. Load 1,000 m² of 30 mm pad and you have used:

• Volume: about 30 m³ — effectively a full 20-foot container
• Weight: about 3.2 tonnes — roughly a ninth of what the container could carry

You run out of space long before you run out of weight. That is why the FOB price is not the price: on a bulky foam product, freight and container utilisation can add a large multiple to the landed cost, and the difference between a well-packed shipment and a badly packed one is real money.

So when you compare suppliers, compare loading plans, not only unit prices. Ask each supplier how many square metres they load into a 20-foot and a 40-foot high-cube, at your thickness, and what the pallet dimensions and stack height are. Two suppliers quoting the same FOB price can differ by more than 10% in landed cost on packing alone.

What to do with a sample before you order

You do not need a laboratory to eliminate most of the risk. With one sample sheet you can check five things in an afternoon:

1. Measure the thickness in several places with a caliper. Consistency across the sheet and between sheets tells you more about production control than the nominal figure does.
2. Weigh it and calculate the density. Measure the sheet, weigh it, divide mass by volume. If the measured density is well below the claimed figure, the claim is optimistic.
3. Soak it. Submerge the sample for 24 hours and weigh it again. A closed-cell foam should take on almost no water. This one test separates closed-cell XPE from open-cell rebonded foam, and it is the difference that matters most in wet and pet applications.
4. Engage the interlock. If you may need to mix suppliers or extend later, verify the edges actually mate — nominal "standard size" claims do not guarantee a compatible profile.
5. Compress and release it repeatedly and watch how it recovers. Slow or incomplete recovery predicts a surface that goes flat under play.

Do this before the order, not after the container arrives.

Comparing quotations: the terms must match

Before comparing any two prices, make sure all of these match. If one does not, the comparison is meaningless.

• Incoterm — FOB port, CIF port or delivered. On bulky foam these differ enormously.
• Coverage basis — effective coverage, not overall sheet size.
• Thickness and density — both. A 30 mm pad at 90 kg/m³ and one at 120 kg/m³ are different products.
• Edge type — interlocking or straight edge, and whether the price includes both.
• Packing — pallet size, sheets per pallet, whether pallets are included or returnable.
• Payment terms and validity — how long the price holds.
• What is excluded — the most informative line in any quotation.

Red flags

• A safety or performance claim with no test report, or a report that covers only the pad when the standard requires the whole system.
• Density or thickness given as a range so wide that any product would qualify.
• No test method named next to any number.
• A price that is dramatically below the field, with no explanation of where the material or the process differs.
• Refusal or delay on sending a physical sample.
• Willingness to certify a thickness or configuration the supplier has never tested — including at your request. A supplier who will write any certificate you ask for will not be there when the project is inspected.

RFQ template you can copy

Send this and you will get comparable answers instead of a wall of different numbers.

1. Application and, if relevant, required fall height or certification target.
2. Required thickness and density.
3. Edge type: interlocking or straight edge.
4. Quantity in m² of effective coverage.
5. Incoterm and destination port.
6. Required: property values with test methods; system test report where a standard applies; loading plan in m² per 20-foot and 40-foot high-cube.
7. Required: physical sample before order.
8. State that quotations quoting overall sheet size instead of effective coverage will not be considered.

Frequently asked questions

A note on our own data

We publish this checklist because it is the one we would want used on us. Where our own values are marked under testing, they have not yet been verified by an independent laboratory, and we will tell you that plainly rather than dress it up. If a project requires EN 1177, ASTM F1292, EN 15330-4 or FIFA documentation, state the requirement and we will tell you honestly what we can and cannot currently provide — including when the honest answer is that you should buy elsewhere.

Our EcoDrain range is produced in 20 mm, 30 mm and 40 mm from 100% recycled XPE, in interlocking sheets of 2290 × 940 mm overall (2250 × 900 mm effective). See the full specification →