Canada: Canada General Standards Board Update to Flammability Standard CAN/CGSB-4.2 No. 27.5
Vol. 1341 | February 17, 2023
In January 2023, The Canada General Standards Board (CGSB) published the CAN/CGSB-4.2 No. 27.5-2023 Flame Resistance – 45° angle test- One second flame impingement, which supersedes the CAN/CGSB-4.2 No. 27.5 2008 and CAN/CGSB-4.2 No. 30.3-1994.
For textile products under the Textile Flammability Regulations SOR/2016-194, as well as the tight-fitted children’s sleepwear under the Children’s sleepwear Regulations SOR/2016-169, the flame spread time must be determined according to the test method CAN/CGSB-4.2 No. 27.5, which gets amended from time to time
This standard determines the flame spread properties of a textile product when a specimen is supported at an angle of 45°, and a flame is applied to its surface for 1 second. It also describes the dry cleaning and laundering procedures for removing non-permanent flame-retardant treatments applied to textile products.
The summary of changes is outlined below:
Definitions for “base burn,” “charred/charring,” and “melting” have been added.
Base burn- the base of a specimen having a raised fiber surface is ignited, charred, melted, or fused to a point where the damage is apparent from the underside of the specimen.
Charring-formation of carbonaceous residue during pyrolysis or incomplete combustion.
Melting- phenomena accompanying the softening of material under the influence of heat (including shrinking, dripping, and burning of molten material, etc.)
- Incorporated dry-cleaning requirements from CAN/CGSB-4.2 No. 30.3-1994.
- Added informative Annex B outlining burning codes to describe results, as listed below:
- Did Not Ignite (DNI)
- Ignited But Extinguished (IBE)
- Surface Burn (SB)
- Surface Burn, Base Burn (SBBB)
- Surface Flash (SF)
- Surface Flash, Base Burn (SFBB)
- Timed Surface Flash (TSF)
- Timed Surface Flash, Base Burn (TSFBB)
- Added informative Annex C to describe testing steps related to the presence of flame retardants.
- Updated figures.
- Updated washing and drying parameters, cooling times, and criteria for testing additional specimens.
The following is the link to the updated method: https://publications.gc.ca/site/eng/9.919243/publication.html