GB 29993-2013 Technical conditions and evaluation methods for rubber and plastic hoses and hose assemblies for household gas use

A. When conducting a gas resistance test, select a sample with a width of 10mm, a length of 50mm, and a thickness of 2mm on the inner lining (outer covering) of the hose, and use Figure A.l

The test apparatus shown is placed in a saturated n-pentane gas environment with a purity of over 98% at a test temperature of 35C ± 2C.

After holding for 48 hours, take it out and place it in a dry container with a diameter of about 240mm, and keep it at room temperature for about 60 minutes. Then within 30 minutes

Measure the sample mass and calculate the mass change rate according to equation (A.1).

△ m n2 -m !

X 100% (A.1)

m

In the formula:

Δ m mass change rate,%;

The mass after the 22 gas resistance test, measured in grams (g);

The mass before the m1 gas resistance test, measured in grams (g).