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UL 350 Fire Rating Explained | Safes and Fire File Cabinets

Posted on December 12, 2012 by admin There have been 0 comments

The most trusted fire rating a safe or filing cabinet can carry is from UL. Underwriters Laboratory was founded to test products for public safety. It is an independent and objective laboratory. It was founded in 1894 and has since tested more and more diverse products and materials for safety.UL Classified Rating

In addition, Underwriters Laboratory tests products which promise fire resistance. When you see the UL label on a safe or file cabinet you will have the peace of mind that Underwriters Laboratory has tested the product to ensure it has the fire resistance specified.

A fire rated safe is insulated with fire resistant material. The type and amount of insulation is what protects the contents of a safe in case of fire. When you see the UL 350 label you know a safe or file is designed to protect paper documents and records from fire disaster and damage.

What the UL 350 Label means is that the Underwriters Laboratory tested a safe for a length of time by exposing it to fire and the interior remained at 350°F or below. This is important because paper will start to char at temperatures above 350°F.

When Underwriters Lab is testing a safe in one its testing furnaces, it always exposes the product to a temperature higher than the average building fire. The average heat in a building fire is 1200F. When you buy a FireKing or Sentry product from us, the temperature of the testing will be specified.

The following is the way Underwriters Laboratory tests products which receive the UL 350 rating:

UL 350 One-Half Hour Rated Products - The furnace is heated up to 1550°F over a one-half hour time period. During this time, the interior of the product cannot exceed 350°F.

UL 350 One-Hour Rated Products - The furnace is heated up to 1700°F over a one hour time period. During this time, the interior of the product cannot exceed 350°F.

UL 350 Two-Hour Rated Products - The furnace is heated up to 1850°F over a two hour time period. During this time, the interior of the product cannot exceed 350°F.

UL 350 Three-Hour Rated Products - The furnace is heated up to 1920°F over a three hour time period. During this time, the interior of the product cannot exceed 350°F.

UL 350 Four-Hour Rated Products - The furnace is heated up to 2000°F over a four hour time period. During this time, the interior of the product cannot exceed 350°F.

A UL 350 rated safe or fireproof filing cabinet may include a rating to protect hard drives or flash drives from heat damage. It is important to ask if your product carries this rating! FireKing file cabinets do carry an ETL rating to protect hard drives for up to one half hour.

For answers to your questions, click live chat or call Toll Free 1-866-867-0306.


This post was posted in Ratings & Standards and was tagged with ul rated, fireproof, fire resistant, fire safe, classified, independent testing

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