This is marbleized vinyl insulating sheet flooring built to MIL-DTL-15562G, Type I — the version installed in naval vessels in high-voltage compartments. Unlike a portable runner, it's laid as continuous flooring with heat-welded seams that give the finished surface water-tight integrity. It comes in blue standard or blue high gloss at 1/8 inch thick.

What a Welded Insulating Floor Does That a Portable Mat Cannot

The insulating principle is the same across every product in this family. Current needs a complete circuit, and a person standing on bare deck in front of energized equipment is half of one. A non-conductive surface underfoot means the circuit has nowhere to close.

What changes here is coverage. A portable mat protects the footprint it occupies, and it has edges — places where the protection stops and somebody can step off without noticing. Sheet flooring with welded seams protects the whole compartment. There is no edge to step past because the floor itself is the barrier.

That distinction matters most in spaces where people work all around energized equipment rather than standing at one panel. In a shipboard high-voltage compartment, there isn't a single spot to place a mat. The protection has to be the deck.

The welded seams do a second job. Heat-welding the joints with matching thread produces a water-tight surface, so moisture can't get beneath the flooring and sit between the covering and the deck. On a vessel that matters for corrosion as much as for insulation, and it's the reason this product is installed rather than laid down.

The trade is permanence. This isn't something you roll out, use, and move. It's installed, and it stays. If you need coverage you can reposition, a portable runner is the right product and this one isn't.

Why Type I Marbleized, and What Gets Certified

MIL-DTL-15562G is the military detail specification for insulating switchboard matting and sheet floor covering. It's approved for use by the Department of the Navy and available across all departments and agencies of the Department of Defense. It supersedes MIL-M-15562F, which still appears on older drawings.

Type I within that specification is the marbleized sheeting. It has no connection to ASTM D178's Type I — same words, unrelated numbering systems, and both standards appear side by side in this catalog. Check which standard a drawing names before reading the type number.

The voltage figures are identical across all three MIL types, because the type describes surface and installation method rather than electrical rating. Dielectric test voltage is 30,000 VAC. Proof testing runs at 15,000 VAC across the entire surface of every roll. Recommended maximum use voltage is 3,000 VAC.

Read that last figure carefully. Military specification does not mean higher rated — commercial ASTM D178 Class 2 matting is cleared to 17,000 volts, well above this. The military standard applies a much wider margin between test voltage and service voltage. Different philosophy, not a different capability.

Where the military specification does go further is durability. The material meets additional property requirements for oxygen bomb aging, sulfuric acid exposure, and ultraviolet light exposure. Those test how the compound survives over years rather than what it withstands in a single dielectric test — which is the right emphasis for flooring that gets installed permanently.

The surface is fire-retardant, every roll is certified to the specification, and it's manufactured in blue standard or blue high gloss finish. Matching color welding thread is available for the seams.

Where It Belongs, and Where It Doesn't

Naval vessels first — high-voltage compartments are the application this was designed around. Beyond that, it suits any permanently occupied electrical space where a continuous insulating floor makes more sense than placed mats: control rooms, equipment compartments, and dedicated electrical spaces operating within the rated voltage. It sits with the rest of our electrical and switchboard matting, which covers the portable types and the commercial standards.

The finish choice follows the room. Blue standard is the workhorse and hides marks better in a working compartment. Blue high gloss reflects more light, which brightens a windowless space and reads as a more finished installation — worth considering where the compartment gets visitors or inspections.

The voltage boundary is 3,000 VAC. Equipment above that needs a different product regardless of what the specification package says, and that conflict belongs with whoever wrote the drawing rather than resolved on the deck.

Where it's the wrong choice: any application needing portability. If the requirement is a mat in front of one panel, or coverage that moves with the work, Type II smooth and Type III diamond plate exist for exactly that and install in minutes rather than requiring a flooring crew.

What it is not: an ESD or anti-static floor. Those are conductive by design, built to drain static charge to ground and protect sensitive electronics. This is an insulator — it blocks the path to ground entirely, offers no static control, and must never be grounded.

And it is not primary protection. De-energizing, verification, protective equipment, and trained procedure come first. This is the layer beneath all of that.

Three Things to Check Before You Spec It

First, confirm you want installed flooring rather than a mat. This is bonded down and welded at the seams, which means a proper installation and a permanent result. That's the right answer for a compartment and the wrong answer for a single panel. If the coverage needs to move, buy a runner instead.

Second, plan the seams before you measure. Rolls are 36 inches wide, so any space wider than that has seams, and every seam has to be heat-welded with matching thread for the water-tight integrity to hold. Lay out the seam positions with the installer, and order the welding thread with the material rather than after it.

Third, check 3,000 VAC against your equipment. Find the real working voltage rather than assuming, because the military designation implies capability the rating doesn't support. This is the most common error on MIL spec products, and permanent flooring is an expensive place to discover it.

Why Mats Inc.

Since 1964 we've learned to ask one question early on this product: is this a mat or a floor? People arrive asking for switchboard matting and describe a compartment, which is a flooring job with welded seams and an installer. Others describe a panel, which is a runner they can roll out this afternoon. We'll ask which one you actually have, along with your voltage and your specification call-out, before we quote anything.

Frequently Asked Questions

What makes Type I different from the other military spec options?

Installation method, and it's a bigger difference than it sounds. Type I is sheet floor covering — bonded down and joined with heat-welded seams so the finished surface is continuous and water-tight. Type II smooth and Type III diamond plate are portable runners you roll out in front of equipment or across a bench.

The electrical performance is identical across all three: 30,000 VAC dielectric test, 15,000 VAC proof test over the entire surface, 3,000 VAC recommended maximum use. What you're choosing between is coverage and permanence. A runner protects where it sits and has edges somebody can step past. Welded sheet flooring protects the whole compartment with no edge at all, which is why it's what goes into naval high-voltage spaces. — Dustin Thompson, Owner & CEO, Mats Inc.

What are the ratings, and what does the additional testing cover?

Dielectric test voltage is 30,000 VAC, proof testing runs at 15,000 VAC across the entire surface of every roll rather than sampled sections, and the recommended maximum use voltage is 3,000 VAC. That last number governs placement. The margin above it is deliberate rather than capacity to draw on.

The additional requirements are what set this specification apart from a pure voltage standard. The material has to perform against oxygen bomb aging, sulfuric acid exposure, and ultraviolet light. Those test how the vinyl survives over years and against conditions that degrade it — which matters far more on permanently installed flooring than on a mat you can replace in an afternoon. The surface is also fire-retardant, and every roll is certified to the specification. — Dustin Thompson, Owner & CEO, Mats Inc.

How does it install, and does it need grounding?

It's bonded to the existing deck or floor and the seams are heat-welded with matching color thread. That welding is what delivers the water-tight integrity, so it isn't optional finishing — it's what makes the installation perform as specified. This is work for someone experienced with welded vinyl flooring, not a roll-and-trim job.

No grounding, and that deserves emphasis on a permanent installation. Grounding an insulating floor destroys its entire function, because the mechanism is that no path runs from a person through the covering to ground. Anyone used to conductive or ESD flooring may expect a ground connection as part of the install. On this product that expectation is dangerous, and it's much harder to undo once the floor is down and welded. — Dustin Thompson, Owner & CEO, Mats Inc.

What size does it come in, and how do I estimate a compartment?

It ships in 36 inch by 75 foot rolls at 1/8 inch thick, and each roll weighs 225 pounds — plan on two people and equipment to move it.

For estimating, measure the length and width of each space and calculate square footage, then think in strips rather than area. At 36 inches wide, work out how many runs the room takes and where the seams land, adding a few inches of overlap at each joint for trimming and welding. Add margin for cuts around equipment bases, hatches, and fixtures. Order the matching welding thread at the same time — you'll need it, and it's frustrating to have the flooring on site without it. Send us the room dimensions and we'll work the strip layout with you. — Jinna Hopson, Vice President of Marketing, Mats Inc.

What's the difference between blue standard and blue high gloss?

Both are the same marbleized blue with identical specification, thickness, certification, and rating. The difference is the finish, and it changes how a compartment reads more than you'd expect.

Blue standard has a lower sheen that diffuses light and forgives scuffs, marks, and foot traffic — the practical choice for a working space that sees daily use. Blue high gloss reflects considerably more light, which genuinely brightens a windowless compartment where lighting is limited, and it presents as a finished, maintained installation. That makes it worth considering in spaces that get inspections, tours, or visitors. The trade is that gloss shows wear and scuffing sooner, so it asks for more upkeep to keep looking the way it did on day one. — Jinna Hopson, Vice President of Marketing, Mats Inc.

Do I need this, a portable runner, or a commercial mat?

Three questions sort it out. Does your paperwork name MIL-DTL-15562G or the older MIL-M-15562F? If so, you're in the military line, and a commercial mat won't satisfy that call-out however it's rated. Is the equipment within 3,000 volts? Above that, you need the commercial ASTM line, where Class 2 reaches 17,000 and higher classes go further.

Then the question that actually separates this product from its siblings: are you covering a compartment or protecting a position? A whole space with people working all around energized equipment wants continuous welded flooring with no edges to step past. A single panel or a bench wants a portable runner — Type II smooth for benches and clean-down, Type III diamond plate where traction matters. Describe the space and the specification to us and we'll tell you which of the three fits. — Jinna Hopson, Vice President of Marketing, Mats Inc.

Written by Jinna Hopson, Vice President of Marketing, Mats Inc.

Stat-Zap Matting

Stat-Zap Matting is an anti-static floor mat designed to protect sensitive equipment from electrostatic discharge (ESD) while offering superior comfort and durability. Featuring a carpet top and a conductive surface, this matting is ideal for environments where static control is crucial, such as data centers, laboratories, and manufacturing facilities.

Key Features of Stat-Zap Matting

• Anti-Static Protection: Designed to dissipate static electricity, this mat protects electronic equipment and devices from electrostatic discharge (ESD).
• Durable Carpet Top: The carpeted surface offers comfort underfoot while standing and provides a stylish yet functional appearance for professional settings.
• Slip-Resistant Backing: Features a slip-resistant backing that ensures the mat stays securely in place, even in high-traffic areas.
• ESD Safe: Certified for use in environments where static control is critical, making it an essential matting solution for electronics manufacturing, server rooms, and cleanrooms.
• Low Maintenance: Easy to clean and maintain, this matting can be vacuumed regularly to keep it looking fresh and functioning at its best.
• Versatile Applications: Perfect for use in offices, laboratories, and industrial settings where static-sensitive equipment is used.

Perfect for Static-Sensitive Environments

Stat-Zap Matting is the ideal solution for environments that demand static control and comfort. Its durable carpet top, anti-static properties, and slip-resistant design make it perfect for protecting equipment and ensuring safety in static-sensitive areas.

This is ASTM D178 Type I switchboard matting in a corrugated finish — an insulating rubber barrier for people working on or near energized electrical equipment. It's available in Class 2, Class 3, and Class 4, and the class you choose is the specification. Every roll is proof tested at the voltage specified for its class, across the entire surface.

What Switchboard Matting Does Before Current Finds a Path Through a Worker

Electricity needs a complete circuit. A worker standing on a concrete floor in front of an energized panel is a potential half of one — if their hand contacts something live, current travels through the body, down through the legs, and into the ground. The floor is what completes the path.

Switchboard matting interrupts that path. It's an insulating barrier between the worker and the floor, engineered so current cannot pass through it to reach ground. The person can still be exposed to a live conductor, but the circuit has nowhere to complete, and that difference is the entire point of the product.

This is worth stating plainly because it runs opposite to another kind of matting people confuse it with. Anti-static and ESD matting is deliberately conductive — it drains charge to ground on purpose. Dielectric matting blocks that path completely. Substituting one for the other, or grounding a mat that must never be grounded, removes the protection entirely.

The consequences here aren't measured in downtime or floor wear. Electrical incidents at switchgear and distribution equipment are the kind that end careers and lives. Insulating matting is one layer in an electrical safety program that also includes de-energizing where possible, proper protective equipment, and trained procedure. It is not a substitute for any of those.

Why Type I Rubber Construction, and Why Class Matters More Than Anything Else

ASTM D178 governs insulating matting for electrical work, and it sorts product two ways. Type identifies the compound the matting is made from. Class sets the voltage the material is tested and rated for. Both belong on a specification, and both have to match the job.

This is Type I — a vulcanized rubber compound. Rubber gives you a well-understood insulating material with the flexibility to lie flat, roll up, and stay workable across normal temperature ranges. It's the baseline construction in the standard, and for most indoor electrical rooms it's exactly what's called for.

Class is where your attention belongs. Class 2, Class 3, and Class 4 are three different products wearing the same name, and each carries its own proof test voltage and its own maximum recommended use voltage. Thickness increases with class, because insulating capacity comes from material. Picking a class because it was in stock rather than because it matched your equipment is the failure mode this whole category exists to prevent.

The testing detail that matters most: every roll is proof tested at its class voltage over the entire surface, not sampled. A dielectric barrier is only as good as its weakest square inch, and a spot check across a 75-foot roll would leave most of that surface unverified. Full-surface testing is the difference between a rated product and a plausible one.

Rolls are guaranteed single piece. That sounds like a shipping detail and isn't. A splice is a discontinuity in the insulating barrier, and discontinuities are where protection fails. A single-piece roll means the material in front of your panel is continuous end to end.

The corrugated surface runs as ridges across the mat, giving traction where workers stand for long periods and where the floor may pick up oil or moisture. Each piece is permanently marked at regular intervals with the manufacturer, the standard, the type, and the class — so what arrives on your dock can be verified on sight rather than taken on trust.

Where It Belongs, and Where It Doesn't

The applications are specific and they're all electrical: distribution boards, switchgear, sub-stations, transformers, generators, and electrical workbenches. The common factor is a person working at or near energized equipment who needs the floor beneath them to stop being a conductor.

Coverage is usually what people get wrong. The matting should extend across the full working area in front of the equipment, far enough that a worker can move, step back, or reach without ever having a foot off the mat. A strip narrower than the panel is a strip somebody will step past. It sits alongside the rest of our electrical and switchboard matting, which covers the other type and class combinations.

What it is not: an ESD or anti-static mat. It will not dissipate static charge, protect sensitive electronics, or work as a bench mat for soldering and component handling. Those products are conductive by design and belong to a completely different specification. If static control is what you need, this is the wrong product and it will not do that job.

It's also not an anti-fatigue mat, an entrance mat, or general floor protection — despite the corrugated surface offering traction. Specifying it for comfort or coverage means paying for dielectric performance where it isn't needed, and it can leave people assuming a work area is protected when the mat was never placed for that reason.

And it is not primary protection. Electrical safety work starts with de-energizing and verifying, then protective equipment and procedure. Insulating matting is a supplementary layer beneath all of that, not a reason to skip any of it.

Three Things to Check Before You Spec It

First, match the class to your actual working voltage. Find the real voltage at the equipment rather than assuming, then select the class rated at or above it with margin to spare. Class 2, 3, and 4 are all available here, and moving up a class costs far less than discovering mid-project that the mat under someone's feet was never rated for the panel in front of them.

Second, build inspection into your routine. Dielectric failure is invisible. A cut, a puncture, embedded metal debris, or chemical and oil contamination can compromise the insulating barrier while the mat still looks perfectly serviceable. Inspect regularly, replace anything damaged rather than working around it, and follow your facility's retest interval. A mat people trust and shouldn't is worse than no mat.

Third, size the coverage to the work, not to the equipment. Measure the area a worker actually occupies and moves through while working the panel, then choose a width that keeps them fully on the mat throughout. Cutting a roll into panel-length sections is normal practice. When it's a close call between two widths, take the wider one — the extra material is minimal across a full roll and it removes the most common coverage mistake.

Why Mats Inc.

We've been supplying industrial and commercial matting since 1964, and safety-rated electrical products are where getting the specification right matters more than anything else we sell. We'll ask what voltage you're working at and what the equipment is before we quote, because type and class aren't preferences — they're the whole product. If your application needs a class we don't have in front of you, we'd rather route you to it than sell you what's convenient.

Frequently Asked Questions

What do Type and Class mean on switchboard matting?

They're the two halves of the specification, and a quote that names only one isn't complete. Type identifies the compound the matting is manufactured from — this product is Type I, a vulcanized rubber compound. Class sets the voltage the material is tested and rated to handle.

Class is the one that changes what you're buying. This product is offered in Class 2, Class 3, and Class 4, and each has its own proof test voltage and its own maximum recommended use voltage, with thickness increasing as the class goes up. Two rolls that look identical on a dock can be rated for very different equipment. Always confirm the class against the voltage you're actually working at, not against what's convenient to order. — Dustin Thompson, Owner & CEO, Mats Inc.

How is it tested, and how do I know it's still protecting anyone a year from now?

Testing is the strongest thing about this product. Every roll is proof tested at the voltage specified for its class over the entire surface rather than sampled at intervals. A dielectric barrier is only as good as its weakest point, so full-surface testing is what separates a rated mat from one that's probably fine. Rolls are also guaranteed single piece, meaning no splice sits in the middle of your barrier. Class 2 material is proof tested at 20,000 volts A.C. with a maximum recommended use voltage of 17,000.

Ongoing, the honest answer is that you have to inspect it. Dielectric failure doesn't announce itself — a cut, a puncture, metal debris pressed into the surface, or oil and chemical contamination can compromise the insulation while the mat looks completely normal. Build inspection into your routine, follow your facility's retest interval, and replace damaged material instead of working around it. A mat people trust that no longer performs is more dangerous than bare floor, because bare floor doesn't create false confidence. — Dustin Thompson, Owner & CEO, Mats Inc.

Where should it be placed, and how much area does it need to cover?

It goes wherever people work at or near energized equipment — in front of distribution boards, switchgear, sub-stations, transformers, generators, and electrical workbenches. The mat's job is to break the path to ground beneath the worker, so it has to be under them the entire time they're exposed.

That's why coverage deserves real thought. Extend the matting across the full working area in front of the equipment, with enough margin that someone can shift their stance, step back, or reach sideways without a foot landing on bare floor. A strip narrower than the panel is a strip somebody will eventually step past, usually at the worst moment. And to be direct: this is supplementary protection. It sits underneath de-energizing, verification, protective equipment, and trained procedure — never in place of them. — Dustin Thompson, Owner & CEO, Mats Inc.

What sizes are available, and how do I work out what to order?

It depends on the class. Class 2 comes in 24, 36, and 48 inch widths in 75-foot rolls. Class 3 comes in 36 inch width in 75-foot rolls. Class 4 comes in 36 and 48 inch widths in 30-foot rolls — shorter because the material is thicker and heavier at that rating.

To work out quantity, go equipment by equipment. Measure the width of each panel or bench, then add margin on both sides so a worker never runs out of mat when they move. Total those lengths, and choose your width based on how far people stand back while working. Cutting a roll into panel-length sections is normal, so one roll usually serves several pieces of equipment. Send us your equipment list and the voltages, and we'll work through both the class and the quantity with you. — Jinna Hopson, Vice President of Marketing, Mats Inc.

What does it look like, and what's involved in handling it?

It's black with a corrugated surface — ridges running across the mat that give traction where people stand for long stretches or where the floor picks up oil and moisture. The look is straightforwardly industrial, which is right for the setting. Nobody is specifying switchboard matting for a lobby.

Handling is the practical thing to plan for. These rolls are heavy, and they get heavier as the class goes up, since higher classes mean thicker material. A full-width roll is genuinely a two-person job with equipment, so think about where it lands on the dock, how it gets to the electrical room, and where you'll cut it. Let it lie flat and relax before final placement, and cut with a sharp blade and a straightedge for clean, safe edges. — Jinna Hopson, Vice President of Marketing, Mats Inc.

Is this the same as an anti-static or ESD mat?

No, and this is the single most important thing to be clear about, because the two get confused constantly and the mistake runs in a dangerous direction. Anti-static and ESD matting is conductive or dissipative on purpose — it exists to give static charge a controlled path to ground so it doesn't damage sensitive electronics. It's designed to conduct.

Switchboard matting is the opposite. It's an insulator, engineered so electricity cannot pass through it to reach ground, which is exactly what protects a worker at a live panel. It offers no static control whatsoever and won't protect components on a bench. More seriously, treating it like an ESD product — grounding it, or swapping one in for the other — removes the protection it exists to provide. If you need static control, we carry proper ESD products and we'll point you at them. If you need shock protection at electrical equipment, this is the right category. They are not interchangeable. — Jinna Hopson, Vice President of Marketing, Mats Inc.

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

• Conductive diamond surface removes static electricity from workers  to prevent damage to sensitive equipment and systems.
• Tested to ESD-S7.1
• Surface resistivity 10⁶
• Diamond pattern
• Black color
• Sold in full rolls only
• Custom mats require one grounding cord per every 10' of mat.
• Cords sold separately: Grounding Cord