GB/T 5137.5-2020Test methods of safety glazing materials used on road vehicles—Part 5: Resistant-to-chemical and resistant-to-temperature changes test (English PDF)

5.1 Test purpose

Determine the resistant-to-chemical properties of plastic-glass composite materials, rigid plastics, and flexible plastics during vehicle use.

5.2 Chemical reagents for the test

5.2.1 Abrasive-free liquid soap

Deionized water contains 1% (mass fraction) potassium oleate solution.

5.2.2 Window cleaning fluid

The aqueous solution OF isopropanol and dipropylene glycol monomethyl ether with concentration of 5%~10% (mass fraction) respectively AND ammonia hydroxide with mass concentration of 1%~5% (mass fraction).

5.2.3 Denatured alcohol

A mixture of 10 volumes of ethanol and 1 volume of methanol.

5.2.4 Gasoline

A mixture of 50% (volume fraction) toluene, 30% (volume fraction) 2,2,4-trimethylpentane, 15% (volume fraction) 2,4,4-trimethyl-1-pentene, and 5% (volume fraction) ethanol.

5.2.5 Kerosene

A mixture of 50% (volume fraction) n-octane and 50% (volume fraction) n-decane.

5.3 Test apparatus

Soaking method should use metal or glassware with suitable capacity.

The test apparatus for weight-bearing method is shown in Figures 1 and 2. USE a metal plate with a length of not less than 25 mm and a thickness of not more 2 - Fixed end.

5.4 Sample

The sample is a flat test piece of 180 mm×25 mm, or a test piece cut from a flat part of the product. Before testing, the sample shall be placed in an environment with a temperature of 23 °C±2 °C and a relative humidity of 50%±5% for at least 48 h.

5.5 Test procedure

5.5.1 Test preparation

The test shall be conducted under ventilated conditions. The operator shall wear safety protective equipment. Before the test, the sample shall be cleaned nondestructively.

5.5.2 Soaking method

POUR each chemical reagent specified in 5.2 into 5 utensils, respectively. The amount of solution should be such that the sample is completely immersed.

After immersing the sample in the chemical reagent for 1 min, take it out; immediately use a clean absorbent cotton cloth to wipe it dry. CHECK the sample for softening, sticking, cracking, or obvious devitrification. For rigid plastics applied to the driving vision area, after the test, take 1 of them and perform the cross-cut test according to the test method of GB/T 5137.1; determine the adhesion level. A new sample shall be used for each chemical reagent.

5.5.3 Weight-bearing method

5.5.3.1 Sample installation

The sample is placed horizontally on the test stand to become a horizontal lever.

One end of the sample is the fixed end. The support is placed 51 mm from the fixed end. A load is applied at the free end 102 mm from the support, as shown in Figure 1. The load mass G is obtained from formula (1):

Where: G - Load mass, in grams (g); […]