Up to 4.5"of 2300° Ceramic Wool & Glass Blanket

2.5" 2300° Ceramic Wool

2.5" applied seamlessly to the entire interior.

3/8" Solid Door Plate

2" Glass Blanket

2" is applied to the top and bottom of the safe, while 1" is applied to the door.

4 Gauge Body

Nearly 1/4" thick.

16 Gauge Steel Liner

Fully encases the entire interior.

Sturdy Gun Safe builds every fire-lined gun safe with 2300°F-rated, 8 lb. density ceramic wool and glass blanket insulation—the same high-performance materials used to contain heat in industrial ovens and kilns. We feature 2 1/2" of ceramic insulator compressed (with a 16g liner) to 2 1/4" for the right, left, back wall, and door jambs. This prevents the material from shaking downward. The top and bottom will have 2.5" of ceramic insulator and 2" of glass blanket. The door will have 2.5" of ceramic insulator and 1" glass blanket. This premium insulation combination is engineered to block heat, not just resist it, maintaining its structure even after exposure to fire. Unlike common alternatives such as drywall or low-density materials, ceramic insulation won’t crumble, separate, or lose integrity—and it fits tightly into every crevice without open seams. The included 16-gauge interior liner also reinforces shelving, offering a sturdier and more secure interior compared to competitors that rely on weak Sheetrock and thin felt liners. With this advanced construction, it’s no surprise that Sturdy Gun Safe stands among the most fire-resistant safes on the market today.

Our fire-lined safes feature a UL-tested intumescent fire caulking sealed with a custom-fit boiler gasket, designed for extreme-heat ovens and kilns. The LCI Firestop Sealant prevents the spread of fire, smoke, and moisture for up to 3 hours, expanding to eight times its size under heat. Our boiler gasket is twice as wide as the average competitor’s, offering 2× better coverage and protection. A precision-fit gasket is essential because no two door clearances are exactly alike. Competitors often use one-size-fits-all Palusol gaskets, which require heat to expand before sealing—leaving gaps vulnerable to fire penetration.

make the fire rating plaque have just a question mark where the rating is.

Our Fire Testing vs. “Fire Ratings”

Our fire-lined gun safes outperform most RSC safes on the market—we’ve proven it in real house burn downs, including an accidental 1-hour-20-minute fire that our safe survived. We don’t post a “fire rating” because we refuse to mislead customers. Most RSC gun safe ratings are either made up or based on non-UL tests that skip critical steps like cool-down time. A few facts: * No UL Fire Rated RSC safes for long gun currently exist. * A UL security rating is not a UL fire rating. * Having UL-rated RSC doesn’t automatically make the safe UL Fire Rated. If a certified UL Fire Rating is essential, you’ll need a smaller, much more expensive UL-rated safe. We’d love to get that rating, but UL testing costs are high—and we’d still be compared to safes with misleading claims.
turn the kiln into a stainless oven with double vertical doors.

How We Tested Vs. Our Competitors

Some safe companies test their fire proof safes in controlled testing furnaces which perform like oversized house ovens yet get a lot hotter than your normal oven. These safe companies eliminate 2 important factors when testing their gun safes to get those ratings: Point Of No Return, and Cool Down Time. Read more about how Sturdy Safe vs. other gun safe companies test for fire ratings.
Real Burns

Fire Resistance: Optional, Not Mandatory

Fire-resistant safes aren’t for everyone—and with Sturdy Safe, you only pay for what you need. If you’re on a budget, it’s better to choose our uninsulated safe with thick steel than a thin, sheetrock-lined safe that offers little fire or security protection. If your insurance covers the contents, you live near a fire department, keep your safe in a low-burn area (like brick or concrete), or have sprinklers, you may not need insulation. For small items needing fire protection, a UL-rated or DIY ceramic-lined fire box inside the safe works great—and performs even better surrounded by our heavy steel. One of our uninsulated safes even survived a partial house fire (13-minute response time), proving that thick steel and size alone provide a degree of fire resistance—though not as much as our insulated models.
Unlined Safe Survival Story

Proven strength—see the insulation process and real house fire results.

How Sturdy Fireproofs Safes
Accidental Burn #1
Accidental Burn #2
asdfasdf

Competitors Insulators

make the safe 5ft tall and remove the handle bar.

Fire Board

Regardless of their fire ratings, they won’t perform as claimed. One must understand how safe manufacturers test safes for fire to understand how testing facilities come up with those inaccurate fire ratings. UL will tell you not to bother testing safes for fire resistance lined with fire board. Read more about Fire Board being a terrible gun safe insulator.
It's Terrible
remove the handle and dial and hinges from this image.

Cement and "Light Cement"

UL actually gives decent fire and security ratings to safes lined with real cement (like in certain high security TL safes). The problem with real cement liners is the cost of the safe itself as well as their extreme weights. Don't get real cement liners confused with light weight dry "cement" composite fire insulation, which don't add much in the way of security.
So Confusing
take out the text. make the safe look taller.

Ceramic Wool

Even though this material is the best fire insulator, the problem lies in the manufacturer not giving you enough of it. Some do as little as lining just the top of the safe due to its high cost and mislead you to believe they line the whole safe with it.
Show Me The Ceramic