GB/T 36289.1-2018Insulating films of crystalline silicon photovoltaic(PV) modules—Part 1: Polyethylene terephthalate films (English PDF)

5.1.2 Pretreatment conditions

Unless otherwise specified, all test pieces shall be treated at a temperature of (23±2)°C and a relative humidity of (50±5)% for at least 24 h. […]

5.1.3 Test conditions

Unless otherwise specified, all tests shall be carried out at a temperature of (23±2)°C and a relative humidity of (50±5)%.

5.2 Appearance

CUT the film of about 1 m, under natural light, CHECK and ASSESS by visual method.

5.3 Thickness

It shall be in accordance with the provisions of Chapter 4 of GB/T 13542.2-2009.

5.4 Shrinkage

According to the provisions of Chapter 23 of GB/T 13542.2-2009, the resolution of the measuring instrument shall not be less than 0.1 mm. Test conditions. Heating temperature is (150±2)°C; heating time is 30 min.

5.5 Water vapor transmission rate

5.5.1 Electrolytic detection sensor method

According to the provisions of GB/T 21529, test conditions. Temperature is (38±2)°C; relative humidity is (90±2)%. TEST 3 test pieces; TAKE the median as the result and REPORT the maximum. It is recommended that this method be preferred.

5.5.2 Infrared detection sensor method

According to the provisions of GB/T 26253, TEST 3 test pieces; TAKE the median as the result and REPORT the maximum.

5.6 Tensile strength and elongation at break

According to the provisions of Chapter 11 of GB/T 13542.2-2009, the tensile speed is 100 mm/min; the distance between marking lines is 100 mm. When there is no dispute, the clamping distance can be 100 mm.

5.13 Damp heat steady state test (double 85 test)

According to the provisions of GB/T 2423.3, in the longitudinal direction on the sample, CUT 5 test pieces of 200 mm×15 mm; HANG them in a constant temperature and humidity test chamber at a temperature of (85±2)°C and a relative humidity of (85±5)% for treatment. The test pieces shall not overlap or contact the inner wall of the container. The treatment time is 1000 h ~ 3000 h (The specific time is agreed upon by the supplier and the buyer). After the treatment, TAKE the test pieces out; WIPE the surface water drops with filter paper or absorbent cotton; and then PUT them in a room temperature dryer to balance for more than 4h. According to Chapter 11 of GB/T 13542.2-2009, the elongation at break of the 5 test pieces is measured. The tensile speed is 100 mm/min. The distance between clamps is 100 mm. The median is taken as the result.

5.14 Ultra-violet (UV) resistance

According to the provisions of 11.10 in IEC 61215-1-1:2016, in the longitudinal direction on the sample, CUT 5 test pieces of 200 mm×15 mm and 3 test pieces of 100 mm×100 mm. The test temperature is (60±5)°C. The UV A wavelength applied is 320 nm ~ 400 nm. The total irradiation energy shall be in accordance with the provisions of Table 2. The minimum UV B wavelength applied is 300 nm ~ 320 nm. After the test, TAKE out the test pieces; DETECT and RECORD whether there is delamination, blistering, cracking, or chalking in the test pieces.

For the test pieces of 200 mm×15 mm, according to the provisions of Chapter 11 of GB/T 13542.2-2009, their elongation at break is measured; the retention rate of elongation at break is calculated; and the median is taken as the result.

For the test pieces of 100 mm×100 mm, according to the provisions of GB/T 3979 and GB/T 7921, their yellow index b is measured; deltab is calculated; and the median is taken as the result.

5.15 Surface gloss

According to the provisions of GB/T 8807, the test angle is 60°.

6.1 Exit-factory inspection

The polyethylene terephthalate films for crystalline silicon photovoltaic (PV) […]