Are Gun Safes Fireproof? What a Fire Rating Actually Promises

Short answer: Are gun safes fireproof? No safe is. A gun safe can be fire-resistant for a stated time, and the rating should tell you three things: how long, how hot, and who tested it. Independent UL 72 ratings give a temperature class and a time rating. Many gun safe ratings are the manufacturer's own. Both can be useful — but only one was checked by someone without a safe to sell.

The search phrase says "fireproof". The labs say fire-resistant, and the difference is the whole point of this page. Below: what a gun safe fire rating means, how fire safes and gun safes differ, what decides whether a safe gets through a house fire, and what you can and can't improve after you buy. If you're ready to compare models, our fire-rated gun safes page lists them with the rating and who issued it.

Gun safe fire rating: the three numbers that matter

A fire rating is a sentence with three parts. Drop one and it stops being a rating.

• How long: the duration of fire exposure, in minutes or hours
• How hot: either the furnace temperature or, in a UL rating, the maximum temperature allowed inside the safe
• Who tested it: an independent lab such as UL or Intertek (ETL), or the manufacturer

UL's own description of its fire label has two parts. The class is the maximum interior temperature reached during testing — Class 350, for example. The time rating is how long the product withstood the fire exposure. UL's guide information lists time ratings in fixed steps, commonly given as ½, 1 or 2 hours and longer.

The class tells you what the rating is meant to protect, according to the scope of UL 72:

• Class 350 (350°F): paper records
• Class 150 (150°F): paper and non-paper records
• Class 125 (125°F): also flexible computer disks

Some products also carry an impact rating. UL tests those before and after a 30-foot drop and returns them to the furnace for up to another hour. Not every UL 72 rating includes that test.

In-house ratings: the number on most gun safe stickers

Many gun safe fire ratings come from the manufacturer's own testing. Liberty Safe describes its method publicly: it says it has fire-tested over 300 safes following guidelines developed by NIST, ramping the heat to 1,200°F within ten minutes and holding it there for the duration of the test.

That's a stated method, and it's more than most listings offer. It's also a different kind of claim from a UL classification. The furnace temperature describes the fire outside the safe. A UL class describes the temperature inside it.

The Marketing Department likes the outside number. It's bigger. "1,200°F" looks like protection; it's actually a description of the problem. What you want to know is what the inside reached, and who wrote that down.

Then there is the middle ground. Intertek, an OSHA-recognized testing laboratory, issues ETL marks. Its verification for SentrySafe chests and files, for example, uses a modified UL 72 that runs the fire endurance test only, without the explosion and impact tests. Independent lab, modified standard. Say both halves when you compare.

What is a good fire rating for a gun safe

There's no single cut-off, and anyone who gives you one is selling a sticker. Here's how I'd rank what you find:

1. Independent rating with a class and a time — for example "Class 350, 1 hour (UL)". You know how long, how hot inside, and who checked.
2. Independent verification of a modified test — for example "1 hour, ETL Verified, modified UL 72". Read which parts were run.
3. Manufacturer's rating with a stated method — minutes at a furnace temperature, tested in-house. Useful for comparing one brand's models with each other.
4. A number with no method and no lab. That's a mood, not a rating.

Inside any of those tiers, longer is better. A longer rating buys more time for the fire to burn out or be put out.

Then match the class to the contents. Paper is the easiest thing to protect. Photos, drives and other media need a lower interior temperature, which is why UL 72 has Class 150 and Class 125. A rating built for paper is not a promise about a hard drive.

Fire safe vs gun safe: two ratings, two different jobs

A gun safe and a fire safe answer different questions.

• Gun safe: rated for burglary resistance. Under UL 1037, gun safes are Residential Security Containers (RSC), tested against a timed attack with tools. UL Solutions lists UL 1037 as the standard for gun safes.
• Fire safe or document safe: rated for fire resistance, typically under UL 72 or a modified version of it.

The labels don't overlap. A UL RSC rating says nothing about fire, and a UL 72 rating says nothing about burglary. A gun safe can have both, one or neither. When a listing says "fire and burglary rated", check that both ratings are named — and who issued each one.

Gun safe vs fire safe comes down to the threat you're buying for. For long guns, you need a gun safe and then a fire rating on top. For passports and deeds alone, a fire-rated document safe may do the job at a fraction of the size. Our guide to gun safe testing covers the burglary side in detail.

Will a gun safe survive a house fire

Home fires are common. The NFPA estimates US fire departments responded to 329,500 home structure fires in 2024, which caused 2,920 civilian deaths and 8,920 civilian injuries.

Whether a particular safe protects its contents depends on how long and how hot the fire burns where the safe stands, compared with what the safe was rated for. A rating describes the safe's performance under test conditions. A real fire sets its own duration and temperature, and no rating can promise the outcome of every fire.

What a rating does give you is a comparison. Two safes rated by the same lab to the same standard can be ranked. A longer rating from an independent lab is a stronger position than a shorter one, or than a number with no method.

How to fireproof a gun safe: what you can actually improve

You can't add a rating after you buy. The insulation, door design and seal were set at the factory, and that's what was tested. What you can do is keep the safe performing as designed.

• Look after the door seal. Many fire-rated doors use an intumescent seal that expands when heated. Liberty Safe says its Palusol seal expands to several times its original size when exposed to intense heat and closes gaps around the door. Its gasket-care article advises inspecting the seal for splits, brittleness and corner gaps, cleaning it with a soft, slightly damp cloth, and avoiding bleach- or ammonia-heavy cleaners.
• Replace a damaged seal with the right part. Liberty says to confirm the correct replacement with its support team before fitting one. Other makers will have their own parts.
• Store sensitive media separately. If a rating is built for paper, a smaller container rated for media — Class 150 or 125 — gives photos and other non-paper records a lower interior temperature target.
• Keep the manual. Fire-lining, seal and anchoring details differ by model, and the manual is where the manufacturer puts them in writing.

(I keep a folder of these manuals on my phone. It is not a small folder.)

Here's the catch: the outside number is not the inside number

A rating of "75 minutes at 1,200°F" and a rating of "Class 350, 1 hour" are not two sizes of the same thing. One is a furnace temperature from the manufacturer's test. The other is a maximum interior temperature from an independent lab. You can't convert one into the other, and a listing that puts them in the same column is comparing different sentences.

The second catch is that a gun safe's fire rating and its burglary rating are separate. A heavy, well-built RSC can have a modest fire rating, and the reverse. Read both lines before you decide what you're paying for.

Skip it if: when a fire-rated gun safe isn't the answer

• You're mostly protecting documents. A fire-rated document safe or box with an independent rating may suit the job better than a large gun safe.
• You need media protection. A gun safe rated for paper won't make your drives safe. Look for a Class 150 or 125 media container.
• The listing gives a number and nothing else. No method, no lab, no class: skip it and look at the next one.
• You're comparing on fire alone. Burglary resistance still matters for firearms. Check the RSC line too, then bolt it down.

Here's what to do with this. Find the fire line on the safe you're looking at and write it out as how long, how hot, who tested. If one of the three is missing, ask the manufacturer for it in writing before you buy — and if it never arrives, that's your answer.