Diamond Plate Vinyl Switchboard Matting (ASTM)

This is ASTM D178 Type II, Class 2 switchboard matting in a diamond plate finish — an insulating vinyl barrier for people working at or near energized equipment. It's rated to a maximum recommended use voltage of 17,000 volts A.C., proof tested at 20,000 across the entire surface of every roll, and available in three widths at 1/4 inch thick.

What Insulating Matting Does Before a Bad Second Becomes a Bad Outcome

Current has to complete a circuit to hurt anyone. A worker standing on bare concrete in front of an energized panel is already half of one — hand on something live, feet on something grounded, and the path runs straight through them. Insulating matting removes the second half.

Stand on it and the floor stops being a conductor. Contact with a live part is still contact, but the current has nowhere to go, and what would have been an incident becomes a moment somebody talks about later.

The failure this prevents is rarely dramatic beforehand. It's a routine job on familiar equipment, a hand placed slightly wrong, a step taken without looking. Nobody plans for the second it happens, which is exactly why the protection has to already be underfoot rather than something anyone remembers to deploy.

That's the case for treating insulating matting as permanent infrastructure. It doesn't depend on training holding up on a bad day, and it doesn't ask anyone to make a decision. It's simply there, working, on the day everything else slips.

Why a Diamond Plate Surface, and What It Changes

The insulating performance here is identical to the corrugated version of this mat — same Type II vinyl compound, same Class 2 rating, same 1/4 inch thickness, same full-surface proof test. What changes is the top surface, and the difference is worth understanding before you choose.

Corrugations run in parallel ridges, so they grip well across the ridge line and less so along it. A diamond plate pattern is raised in a repeating multidirectional layout, which means traction works the same regardless of which way someone approaches, turns, or plants a foot.

That matters where movement isn't linear. A technician working a panel pivots, sidesteps, and backs up. Around switchgear and open cabinet doors, people move in every direction, and a surface with no preferred grip direction fits that better than one with ridges running a single way.

The pattern also handles debris differently. Corrugation channels can collect grit and shavings along their length; a diamond pattern breaks the surface into discrete raised sections with nowhere continuous for material to travel. In a shop or plant environment, that keeps the surface working with less attention.

The electrical specification is the part that doesn't vary. Dielectric strength is 30,000 volts A.C., Class 2 sets a maximum recommended use voltage of 17,000, and every roll is proof tested at 20,000 across its full surface — not sampled at intervals, because an insulating barrier is only as good as its weakest square inch. Rolls are supplied single piece, so no splice sits in the middle of the protection.

The vinyl compound is oil resistant and flame resistant. Flame resistance is the obvious one in a room where the equipment is itself an ignition source. Oil resistance matters over the longer run, because a compound that absorbs oils and greases can have its barrier degraded from the inside while the surface still looks perfectly fine.

Where It Belongs, and Where It Doesn't

Distribution boards, switchgear, sub-stations, transformers, generators, and electrical workbenches. It sits with the rest of our electrical and switchboard matting, which covers the other type, class, and surface combinations.

The diamond plate surface earns its place where people move in multiple directions in a confined area — walking the front of a switchgear lineup, working between open cabinet doors, or moving between adjacent panels. It also suits environments where the floor picks up debris, since the pattern doesn't channel material the way corrugations can.

Where corrugated is the better pick: long straight runs along a bench or a wall of panels, where traffic moves in one predictable direction and the ridges align across the path of travel. Neither is a safety difference. It's a fit decision about how people actually use the space.

What it is not: an ESD or anti-static mat. Those are conductive by design, built to give static charge a path to ground and protect sensitive electronics. This blocks that path entirely. Grounding it would defeat its purpose, and the two are not interchangeable in either direction.

It's also not an anti-fatigue mat or general floor protection. The raised pattern gives traction, but comfort isn't what you're buying, and putting insulating matting where it isn't needed can leave people assuming an area is protected when the mat was placed for another reason entirely.

And it is not primary protection. De-energizing, verification, protective equipment, and trained procedure come first. This is the layer beneath all of that — the one still working when something else doesn't.

Three Things to Check Before You Spec It

First, confirm Class 2 covers your equipment. The maximum recommended use voltage is 17,000 volts A.C. Find the actual working voltage at each panel rather than assuming, and if anything sits close to that ceiling, move up a class rather than working to the edge of the rating. The surface pattern has no bearing on the electrical rating.

Second, choose your width by how people move, not by how wide the panel is. Widths run 24, 36, and 48 inches. Watch someone work the equipment: how far back do they step, how far sideways do they reach? The mat needs to stay under them through all of it. When it's close between two widths, take the wider one.

Third, set the inspection routine on day one. Dielectric failure is invisible — a cut, a puncture, metal debris pressed into the surface, or chemical contamination can compromise the barrier while the mat looks fine. Decide now who checks it, how often, and what triggers replacement. A mat people trust that no longer performs is worse than bare floor, because bare floor doesn't create confidence.

Why Mats Inc.

Since 1964 we've carried a line broad enough that we don't have to steer anyone toward whatever's in stock. On this product that shows up in a specific way: corrugated and diamond plate are electrically identical, so the honest recommendation depends entirely on how people move around your equipment. We'll ask about that, and about your voltage, before we quote — and if the answer is the other surface or a different class, that's what we'll tell you.

Product Type	Insulating (non-conductive) switchboard matting
Standard	ANSI/ASTM D178, Type II, Class 2
Dielectric Strength	30,000 volts A.C.
Proof Test	20,000 volts A.C., tested over the entire surface of every roll
Recommended Max Use Voltage	17,000 volts A.C.
Material	High-quality vinyl compound, oil resistant and flame resistant
Surface	Diamond plate
Color	Black
Thickness	1/4 inch
Available Widths	24 inch, 36 inch, 48 inch
Roll Length	75 ft., single piece guaranteed
Roll Weight	24 inch — 240 lb.; 36 inch — 350 lb.; 48 inch — 470 lb.
Recommended For	Distribution boards, switchgear, sub-stations, transformers, generators, electrical workbenches
Static Control	None — this is an insulator, not an ESD or anti-static product
Warranty	1-year limited (Mats Inc.)

Frequently Asked Questions

Is diamond plate as protective as the corrugated version?

Exactly as protective. Both are Type II vinyl at Class 2, both are 1/4 inch thick, and both are proof tested at 20,000 volts A.C. over the entire surface of every roll with a maximum recommended use voltage of 17,000. The pattern is on top of the mat; the insulation is the mat.

So this isn't a performance decision. Pick the surface that suits how people move in the space and how much debris the floor sees, and know that whichever you choose, the electrical protection is the same. If someone tells you one pattern insulates better than the other, they're describing traction, not dielectric performance. — Dustin Thompson, Owner & CEO, Mats Inc.

What are the ratings, and how is it tested?

Class 2 gives you 30,000 volts A.C. dielectric strength, a maximum recommended use voltage of 17,000 volts A.C., and a proof test at 20,000 on every roll. Work to the 17,000 figure — the gap above it is engineered margin for real conditions, not headroom to spend.

The testing method is the part worth knowing. Proof testing runs across the entire surface of every roll rather than sampling sections, because a barrier is only as good as its weakest square inch and a spot check on 75 feet would leave most of it unverified. Rolls are also supplied single piece, so there's no splice sitting mid-run where the protection changes. Beyond the electrical rating, the compound is oil and flame resistant, which is what keeps it performing in year four rather than just on the day it's installed. — Dustin Thompson, Owner & CEO, Mats Inc.

Does it need grounding, and should it be fastened down?

No grounding, and this is worth being blunt about. Grounding an insulating mat destroys the thing it exists to do, because the entire mechanism is that no path runs from the worker through the floor to ground. Anyone used to installing ESD matting may reach for a ground cord out of habit. On this product, that habit is dangerous.

On fastening: it's designed to lie loose. That lets you lift it, inspect underneath, reposition it, and replace it without demolition — and adhesives or mechanical fasteners can puncture or contaminate the barrier. Let it lie flat and relax after unrolling so it stops holding the curl, then cut with a sharp blade against a straightedge so the edges sit tight and don't catch a boot. If it's shifting in a busy area, talk to us before adding anything to hold it down. — Dustin Thompson, Owner & CEO, Mats Inc.

What sizes are available, and how much should I order?

It comes in 24, 36, and 48 inch widths, all in 75-foot single-piece rolls at 1/4 inch thick. Rolls are heavy — 240 pounds at 24 inch, 350 at 36 inch, and 470 at 48 inch — so plan on two people and equipment to move one, and think about where it lands on the dock and how it gets to the room.

For quantity, work equipment by equipment rather than room by room. Measure the width of each panel or bench, add margin on both sides so a worker never runs out of mat when they shift or step back, and total those lengths. Seventy-five feet usually covers several pieces of equipment once it's cut to length. Send us your equipment list with the voltages and we'll size the width and the quantity with you. — Jinna Hopson, Vice President of Marketing, Mats Inc.

What does the diamond plate surface look and feel like?

It's black with a raised diamond pattern — the same visual language as the steel plate you'd see on a stair tread or a truck bed, which is exactly why it reads as industrial equipment rather than as flooring. In an electrical room, that's the right signal for the surface to send.

Underfoot it's a low, broad pattern rather than anything aggressive, so it gives grip without feeling like standing on texture. Because the raised sections point in multiple directions, it grips the same regardless of which way you plant a foot, which is noticeable when you're pivoting between adjacent panels rather than walking a straight line. It also stays presentable — debris doesn't have a continuous channel to collect in, so a sweep or a wipe keeps it looking maintained. — Jinna Hopson, Vice President of Marketing, Mats Inc.

Should I choose diamond plate or corrugated?

Choose diamond plate when people move in more than one direction in a confined space — walking the front of a switchgear lineup, working between open cabinet doors, or stepping between adjacent panels. The multidirectional pattern grips consistently no matter how a foot lands, and it handles debris well because there's no continuous channel for grit to travel along.

Choose corrugated for long straight runs along a bench or a wall of panels, where traffic moves in one predictable direction and the ridges sit across the path of travel. It's also the surface to pick if you want the black and yellow bordered version, which marks the edge of the protected zone in low light. Neither choice is a safety trade — they carry the same rating — so decide it on the space, not the spec sheet. Describe the room to us and we'll tell you which one we'd put in it. — Jinna Hopson, Vice President of Marketing, Mats Inc.

Written by Dustin Thompson, Owner & CEO, Mats Inc.