Why Our EVA Foam Is Built Different
Jun 01, 2026
We get asked all the time: what actually makes Mat Supply foam different from the generic stuff on Amazon? The honest answer isn't a marketing line — it's data. We put our EVA foam through a full battery of ASTM-certified independent lab tests, and the results tell a story worth sharing.
This post breaks down the most important findings in plain language. Whether you're outfitting a custom golf cart, a center console, or a sport boat deck, here's exactly what you're getting under your feet.
1. What's Actually in the Foam
Our EVA foam is a precisely engineered blend of three materials, each doing a specific job:
- 60% EVA (Ethylene-Vinyl Acetate) — the primary cushioning matrix, responsible for flexibility and underfoot comfort.
- 20% LDPE (Low Density Polyethylene) — adds structural support and dimensional stability so the mat holds its shape over time.
- 20% CaCO₃ (Calcium Carbonate) — firms up the surface feel and adds density without weight. This is what most budget foams skip.
The calcium carbonate component is what gives our mats that firm, premium feel underfoot — without sacrificing the flexibility needed to conform to contoured cart floors and boat decks.
2. Three Densities — One for Every Application
We stock three density grades so you can match the foam to the job. All density and water absorption values are tested per ASTM D3574 and ASTM D3575:
| Grade | Density | Shore C Hardness | Water Absorption | Best For |
|---|---|---|---|---|
| Low Density | 0.003 lb/in³ | 35 Shore C | < 0.002 g/cm³ | Comfort-focused, curved surfaces |
| Medium Density | 0.005 lb/in³ | 55 Shore C | < 0.002 g/cm³ | All-purpose golf cart floors |
| High Density | 0.01 lb/in³ | 75 Shore C | < 0.002 g/cm³ | Marine decks, high-traffic areas |
All three grades share the same water absorption rating of less than 0.002 g/cm³ — which is critical for marine applications. Foam that absorbs water becomes heavy, develops mildew, and loses adhesion over time. Ours doesn't.
3. Grip That Actually Works When It's Wet
Coefficient of friction (COF) is the measure of slip resistance. For marine and golf cart applications, the wet COF is what matters most — that's when someone steps off the dock, or it starts raining mid-round. We tested all four surface finishes dry and wet per ASTM D1894:
| Surface Finish | Dry COF | Wet COF |
|---|---|---|
| Smooth (no finish) | 0.47 | 0.67 |
| Knurl finish | 0.60 | 0.71 |
| Brushed — with grain | 0.53 | 0.74 |
| Brushed — against grain | 0.60 | 0.86 ★ Best |
The brushed-against-grain finish delivers a 0.86 wet COF — well above OSHA's 0.5 minimum threshold for slip safety. All four of our finishes exceed that standard, even fully soaked.
4. It Won't Shrink, Warp, or Buckle
Cart floors in Florida hit 120°F in summer. Storage in cooler climates can drop to -20°F. We conditioned test samples for a minimum of 336 hours (14 days) at each temperature and measured dimensional change before and after. Results per ASTM D2216:
| Temperature | High Density | Medium Density | Low Density |
|---|---|---|---|
| −20°F | 0.00 to −0.03% | 0.00 to −0.01% | 0.00 to −0.01% |
| 20°F | 0.00 to +0.01% | −0.02 to 0.00% | −0.01 to 0.00% |
| 72°F (ambient) | 0.00 to +0.02% | −0.01 to 0.00% | 0.00 to +0.01% |
| 80°F | −0.01 to 0.00% | 0.00 to +0.02% | 0.00 |
| 120°F | −0.01 to 0.00% | −0.01 to 0.00% | 0.00 to +0.01% |
Dimensional change across all grades was statistically negligible — less than 0.03% in any direction across the entire temperature range. No curling edges. No peeling corners. No bubbles when your cart sits in the sun all summer.
5. The Adhesive Makes or Breaks It
A mat is only as good as what keeps it down. We offer two PSA (pressure-sensitive adhesive) options and tested both head-to-head on the four substrates you're most likely to install on. All tests used a 72-hour dwell time per ASTM D3330:
| Substrate | 3M 9775WL (lbf/in) | House Brand PSA (lbf/in) | Difference |
|---|---|---|---|
| Stainless Steel | 5.50 | 10.74 | +95% |
| Fiberglass | 7.53 | 10.94 | +45% |
| Polypropylene | 2.75 | 4.20 | +53% |
| ABS Plastic | 3.06 | 5.31 | +74% |
Our House Brand PSA outperforms 3M on every substrate tested — up to 95% stronger adhesion on stainless steel and 45% stronger on fiberglass. For most golf cart and marine installations we recommend the House Brand. The 3M option is available for customers with specific preferences or substrate requirements.
On a boat or golf cart, your floor mat endures vibration, flexing, water exposure, and constant foot traffic simultaneously. A mat that lifts at the edges or slides under load is a safety issue, not just an aesthetic one. Our adhesive data is tested, not estimated.
6. Strength That Holds Up Over Time
We also ran tensile and tear resistance testing per ASTM D3574 Tests E and F. A few highlights worth knowing:
- High-density foam with liner reaches 5,362 kPa tensile strength — exceptional resistance to stretching and tearing forces.
- Low-density foam elongates over 103% before breaking (without liner) — meaning it stretches dramatically during installation on curved surfaces without splitting.
- Tear strength ranges from 3.36 to 16.02 kN/m across grades — the foam won't crack or split at seams and cutouts under normal use.
At Mat Supply, every mat we ship is cut from foam stock that meets these exact specifications. We don't swap materials based on availability or use different suppliers for different orders. When you order from matsupply.com, you're getting the material behind this data.
Have questions about which density or finish is right for your application? Reach out — we're based in Tampa and we know boats and golf carts.
