Flammability Tests -3.
Flammability Test Methods:
In Germany, upholstery fabrics are tested in accordance with DIN 4102 which has been established by the Deutsches Institut fŸr Bautechnik.
DIN 4102 Part 1 - Kleinbrenner (B2)
All materials used in buildings in Germany need to meet the B2 requirement which is determined using a small flame test.
The fabric specimen is suspended vertically and a 20mm high flame is applied for 15 seconds to both the fabric surface and edge. Reference lines are marked on the specimen, which achieves B2 classification if the tip of the flame does not reach the reference marks within 20 seconds on any sample. 5 samples are tested with filter paper being placed below each to determine the production of flaming droplets.
DIN 4102 Parts 15/16 - Brandschacht (B1)
Referred to as the "Brandschacht test", this is the main test method in Germany which measures reaction to fire and is considered the highest flammability standard in the country for upholstery fabrics.
The term Brandschacht, literally "fire shaft", refers to the testing apparatus itself which consists of a square-shaped vertical housing equipped with a gas burner. Four fabric samples are held vertically in a supporting frame and subjected to flames for 10 minutes. At the same time a constant, uniform flow of air is blown into the Brandschacht from below.
In evaluating the test, smoke gas temperature and the mean residual length of the sample are taken into account (residual length is the part of the specimen which has escaped burning). In order to be classified as B1, the tested fabric must show:
1. A mean residual length of not less than 150mm, with no specimen being burned away completely
2. A mean smoke gas temperature of less than 200oC