The Edit — Records
UL Class 350 vs Class 125 Fire Safes: Paper vs Media
Paper chars at about 400°F and a house fire runs past 1,700°F. UL 72 Class 350 holds a safe's interior under 350°F for paper; Class 125 holds it under 125°F for low-temperature media.
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Fireproof is not a rating. UL 72, the standard for fire resistance of record protection equipment, is, and it produces a pair of figures: a class and a duration.
Andyer 2-Pocket Fireproof Document Bag, 15 x 11 in
Good fit You want papers portable as well as protected
Not for You need a certified class and duration
Amazon Basics Steel Security Safe with Electronic Keypad
Good fit Theft and casual access are the problem
Not for Fire is what you are protecting against
SentrySafe Fireproof Document Box with Key Lock
Good fit You want a printed rating you can check
Not for You need it to be portable
SentrySafe Fireproof and Waterproof File Safe
Good fit You file rather than pile
Not for You want the smallest possible box
DocSafe Fireproof Document Organizer Box with Lock
Good fit Passports and cards need their own slots
Not for You want a certified class printed on it
DAYI 2.0 Cu Ft Home Safe with Fireproof Bag
Good fit You need volume more than certification
Not for The contents are genuinely irreplaceable
The class is a temperature ceiling
A safe goes into a furnace that reaches past 1,700°F. Sensors inside record how hot the interior gets and for how long the safe holds the line.
Class 350 keeps the inside below 350°F. That is the paper class, because paper begins to char around 400°F, and 350 leaves a margin.
Class 150 keeps it below 150°F and adds a humidity limit. That is the class for magnetic tape and film.
Class 125 keeps it below 125°F with a tighter humidity limit, for floppy disks and other media that fail at low temperatures.
The number after the class is the hours: Class 350 1-Hour, Class 350 2-Hour. That duration matters more than most buyers realise, because it has to outlast the fire and the time before anyone reaches the safe.
| Class | Interior stays below | Protects |
|---|---|---|
| 350 | 350°F | Paper documents, passports, currency |
| 150 | 150°F, humidity limited | Magnetic tape, film |
| 125 | 125°F, tighter humidity | Diskettes and low-temperature media |
SentrySafe Fireproof Document Box with Key Lock
16,055 ratings from the brand that publishes its class and duration on the label, which is the whole point of this page.
Current price shown on Amazon. We may earn a commission.
| Fire rating | UL Classified, ½ hour at 1550°F |
|---|---|
| Capacity | About 2 reams of paper |
| Owners praise | Fits documents and mementos |
| Watch | Weight and durability split |
16,055 ratings from a brand that prints its rating on the label, which is what separates a rated safe from a heavy box. Read it, though: the listing gives UL Classified for ½ hour at 1550°F, half the 1-hour duration that is the paper standard above. Owners report it holding about 2 reams of paper alongside mementos.
Weight and durability split in the reports, and weight is inherent: the fire resistance comes from the insulating layer inside the walls, and that layer is most of what you are carrying. The listing states no water rating.
Buy it if
- You want a printed rating you can check
- Papers and small valuables in one box
Don't buy it if
- You need it to be portable
Digital media needs UL Class 125 or 150, not 350
A Class 350 safe protects paper and destroys a hard drive. Electronics and magnetic media fail well below 350°F, which is the entire reason the lower classes exist.
That matters more now than it did, because the documents people most want to survive a fire are frequently on a drive rather than on paper. A Class 350 box with a backup drive in it is a box with a cooked drive in it.
The practical answer is usually not a media-rated safe, which is expensive. It is an off-site or cloud copy, with the safe holding the paper originals that cannot be reissued easily.
SentrySafe Fireproof and Waterproof File Safe
15,049 ratings on a file-folder format, which keeps documents upright and findable rather than stacked flat.
Current price shown on Amazon. We may earn a commission.
| Format | Hanging file folders |
|---|---|
| Protection | UL ½ hour fire, ETL water verified |
| Suits | Records kept in order |
15,049 ratings on a file-folder format, which is a genuine functional difference: documents stand upright in hanging folders rather than stacking flat, so you can find one without emptying the box.
Fire and water are both rated here: UL Classified for up to 30 minutes of fire, and ETL verified for water exposure. That fire duration is ½ hour, not the 1 hour this page recommends for paper. Water matters because the thing that puts a house fire out is thousands of gallons of water, and an unrated box that survives the heat can still soak.
Buy it if
- You file rather than pile
- Water damage worries you as much as fire
Don't buy it if
- You want the smallest possible box
Water rating is separate, and fires end in water
A fire rating says nothing about water. A separate immersion test covers that, and safes that pass it state a depth and a duration.
Think about the sequence. A fire is extinguished with water, then the building sits open to weather until anyone can enter. A box that held 350°F for an hour and then sat in six inches of water for two days has lost the papers anyway.
Ratings for both exist on the same product. Where only one is stated, assume the other was not tested.
Andyer 2-Pocket Fireproof Document Bag, 15 x 11 in
4.7 across 8,754 ratings on a bag rather than a box, which is the right tool for papers you need to grab and carry.
Current price shown on Amazon. We may earn a commission.
| Format | Soft bag, 2 zipped pockets |
|---|---|
| Capacity | About 50 pages per pocket |
| Watch | No UL class stated |
The highest-rated product here at 4.7 across 8,754 ratings, and it is a bag rather than a box. Owners describe sturdy zips, sealed seams and about 50 pages per pocket.
No UL class is stated, which is normal for soft bags and worth naming plainly. Its real use is as a grab layer inside a rated safe, or for the papers you would want to carry out with you.
Buy it if
- You want papers portable as well as protected
- It goes inside a safe as a second layer
Don't buy it if
- You need a certified class and duration
DocSafe Fireproof Document Organizer Box with Lock
12,114 ratings on an organiser with passport and card slots, where the lock and the fire resistance both split in the reports.
Current price shown on Amazon. We may earn a commission.
| Format | Organiser with slots |
|---|---|
| Owners praise | Holds multiple binders |
| Watch | Lock and fire claims split |
12,114 ratings on an organiser with dedicated slots for passports and cards, which solves the finding problem that a plain box does not.
Both the lock and the fire resistance split in the owner reports. Read an unstated class as untested, and treat this as organisation with some protection rather than the reverse.
Buy it if
- Passports and cards need their own slots
- Organisation matters as much as protection
Don't buy it if
- You want a certified class printed on it
Security and fire are two different products
Amazon Basics Steel Security Safe with Electronic Keypad
48,007 ratings, the most of the 6 here, and it is a security box rather than a fire-rated one.
Current price shown on Amazon. We may earn a commission.
| Purpose | Security, not fire rating |
|---|---|
| Lock | Electronic keypad |
| Watch | Keypad reports split |
48,007 ratings, the most of the 6 here, and it is a security box: steel, a keypad, and no fire class.
That is a legitimate product for a legitimate problem, and it is not this one. Owners praise the size and the construction and split on the keypad. If fire is the risk you are addressing, a heavier gauge of steel does not help.
Buy it if
- Theft and casual access are the problem
- You want the deepest evidence base available
Don't buy it if
- Fire is what you are protecting against
DAYI 2.0 Cu Ft Home Safe with Fireproof Bag
4.4 is the lowest score here, and owners split on whether they would trust it with valuables at all.
Current price shown on Amazon. We may earn a commission.
| Capacity | 2.0 cubic feet |
|---|---|
| Watch | Keypad failures reported |
| Watch | Owners question the security |
4.4 across 902 ratings is the thinnest evidence base here, and the owner reports are unusually direct: some say it works, others report keypad failures and say they would not trust it with valuables.
Volume is what it offers. For anything genuinely irreplaceable, a smaller box with a printed class and duration is the better purchase.
Buy it if
- You need volume more than certification
Don't buy it if
- The contents are genuinely irreplaceable
What to check on the label
Look for the class and the hours together. A product saying fireproof, fire resistant or heat insulated with no class has not been through the test, whatever temperature figure appears beside it.
Then check where it will sit. A safe on an upper floor may fall through a burnt-out floor, an impact the UL 72 test covers with a 30-foot drop onto rubble after the furnace.
Keep the paper originals that are slow to replace and back the rest up somewhere else entirely. Documenting what you own before you need to is the home inventory that survives a claim, and the same read-the-tested-figure habit runs through air purifier CADR.
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