During development phase Mason Sound Lock doorsets are fire tested at the Mason in-house fire test laboratory. This facility is equipped with a full scale fire test furnace and hose stream testing apparatus and is able to conduct tests in accordance with US, British & Australian Testing Standards.

Doorset models which are successful in-house fire testing are then sent to independent, internationally recognized fire test laboratories for confirmation testing. Mason Sound Lock doorsets have qualified for up to 4 hour fire ratings at Warrington Fire Research Melbourne Australia - BS476 part 20 & 22 and AS1530 Part 4 and at Warnock Hersey Vancouver Canada - ASTM E 2074-00.

          Fire Rating – Up to 4 hours

    (BS476 Part 20 & 22; ASTM E-2074-00 & AS 1530.4 – 1997.)

Before manufacture and release to market, each Mason Sound Lock fire rated doorset model undergoes a series of tests to verify compliance with International Standards. Included in the test series are fire tests that assess the fire resistance level (FRL) of the doorsets. These tests are extremely severe, furnace temperatures are controlled to follow the Standard Time/Temperature curve and reach approximately 1080C after 4 hours.



In order to qualify for FRL ratings doorsets must satisfy the criteria of insulation which specifies limits to the temperature rise on the “cold” face of the door leaf and the criteria of integrity which defines when the door leaf ceases to remains a barrier to the passage of flames and hot gases. (US Standards further require doorsets to be subjected to the Hose Stream test immediately after the conclusion of the fire test.)