Ⅰ.Product Types
Geomembrane is divided into: LDPE Geomembrane, LLDPE Geomembrane, HDPE Geomembrane, EVA Geomembrane, ECB Geomembrane, PVC Geomembrane, and rough-surface Geomembrane, etc.
Ⅱ.Product Functions
Seepage prevention and isolation
Ⅲ.Main applications
1、 Anti-seepage in landfills, sewage or waste residue treatment plants.
2、 River dikes, lake dams, tailings fill dams, sewage dams, reservoir areas, channels, and reservoirs (pits, mines).
3、 Subway, basement, tunnel, and anti-seepage lining of tunnels.
4、 Being used for seepage prevention of saline on roadbeds and other foundations.
5、 Horizontal anti-seepage cover in front of dyke and dam, vertical anti-seepage layer on foundation, construction cofferdam and scrap yard.
6、 Road, highway, railway foundation, and waterproof layer of expansive soil and collapsible loess.
7、 Being mainly used for roof seepage prevention in terms of houses.
Ⅳ.Thickness and deviation
Table 1 thickness and deviation of polyethylene Geomembrane (GH-1, GL-1, GL-2 type)
Item | indicator | ||||||||
Nominal thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
Average thickness mm | ≥0.30 | ≥0.50 | ≥0.75 | ≥1.00 | ≥1.25 | ≥1.50 | ≥2.00 | ≥2.50 | ≥3.00 |
Limit deviation of thickness % | -10 | ||||||||
Note: Thickness specifications and deviations not listed in the table shall be performed by interpolation. | |||||||||
Table 2 Thickness and deviation of high-density polyethylene Geomembrane (GH-2 type) for environmental protection
Items | Indicators | |||||||
Smooth surface | Nominal thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
Average thickness mm | ≥0.75 | ≥1.00 | ≥1.25 | ≥1.50 | ≥2.00 | ≥2.50 | ≥3.00 | |
Limit deviation of thickness % | -10 | |||||||
Rough surface | Nominal thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
≥ Deviation of average thickness % ≥ | -5 | |||||||
Limit deviation of thickness(8 out of 10) % | -10 | |||||||
Limit deviation of thickness (any one of 10)% | -15 | |||||||
Note: Thickness specifications and deviations not listed in the table shall be performed by interpolation. | ||||||||
Ⅴ.Technical performance indicator
Table 1 Ordinary high density polyethylene Geomembrane (GH-1 type)
No. | Item | indicator | ||||||||
Thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
2 | Tensile yield strength (longitudinal and transverse) N/mm | ≥4 | ≥7 | ≥10 | ≥13 | ≥16 | ≥20 | ≥26 | ≥33 | ≥40 |
3 | N/mm Tensile breaking strength (longitudinal and transverse) N/mm | ≥6 | ≥10 | ≥15 | ≥20 | ≥25 | ≥30 | ≥40 | ≥50 | ≥60 |
4 | Yield elongation (longitudinal and transverse)% | - | - | - | ≥11 | |||||
5 | Breaking elongation (longitudinal and transverse) % | ≥600 | ||||||||
6 | Right Angle tearing load (longitudinal and transverse) N | ≥34 | ≥56 | ≥84 | ≥115 | ≥140 | ≥170 | ≥225 | ≥280 | ≥340 |
7 | Piercing resistance Strength N | ≥72 | ≥120 | ≥180 | ≥240 | ≥300 | ≥360 | ≥480 | ≥600 | ≥720 |
8 | Carbon black content % | 2.0～3.0 | ||||||||
9 | Dispersion of carbon black | Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||||
10 | 间（OIT）min Oxidation induction time under the atmospheric pressure (OIT) min | ≥60 | ||||||||
11 | Impact embrittlement performance at low temperature | passing | ||||||||
12 | Permeability indicator of water vapor g·cm/(cm2·s·Pa) | ≤1.0×10-13 | ||||||||
13 | Dimensional stability % | ±2.0 | ||||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||||
Table 2 Smooth-surface high-density polyethylene Geomembrane for environmental protection (GH-2S type)
No. | Items | Indicators | ||||||
Thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≥0.940 | ||||||
2 | Tensile yield strength (longitudinal and transverse) N/mm | ≥11 | ≥15 | ≥18 | ≥22 | ≥29 | ≥37 | ≥44 |
3 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥20 | ≥27 | ≥33 | ≥40 | ≥53 | ≥67 | ≥80 |
4 | Yield elongation (longitudinal and transverse)% | ≥12 | ||||||
5 | Breaking elongation (longitudinal and transverse) % | ≥700 | ||||||
6 | Right angle tearing load (longitudinal and transverse) N | ≥93 | ≥125 | ≥160 | ≥190 | ≥250 | ≥315 | ≥375 |
7 | Piercing resistance strength N | ≥240 | ≥320 | ≥400 | ≥480 | ≥640 | ≥800 | ≥960 |
8 | Stress cracking of tensile load (Notched Constant Tensile Load Method) h | - | ≥300 | |||||
9 | Carbon black content% | 2.0～3.0 | ||||||
10 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||
11 | min Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100
| ||||||
Oxidation induction time under the high pressure ≥400 | ||||||||
12 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥55 | ||||||
13 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥50 | ||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||
a. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 11 and 13 can be either tested. | ||||||||
Table 3 Rough-surface high-density polyethylene Geomembrane for environmental protection (GH-2T1, GH-2T2 type)
No. | Items | indicators | ||||||
Thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≥0.940 | ||||||
2 | Roughness height mm | ≥0.25 | ||||||
3 | Tensile yield strength (longitudinal and transverse) N/mm | ≥11 | ≥15 | ≥18 | ≥22 | ≥29 | ≥37 | ≥44 |
4 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥8 | ≥10 | ≥13 | ≥16 | ≥21 | ≥26 | ≥32 |
5 | Yield elongation (longitudinal and transverse)% | ≥12 | ||||||
6 | Breaking elongation (longitudinal and transverse) % | ≥100 | ||||||
7 | Right Angle tearing load (longitudinal and transverse) N | ≥93 | ≥125 | ≥160 | ≥190 | ≥250 | ≥315 | ≥375 |
8 | 抗穿刺强度N Piercing resistance strength N | ≥200 | ≥270 | ≥335 | ≥400 | ≥535 | ≥670 | ≥800 |
9 | Stress cracking of tensile load (Notched Constant Tensile Load Method) h | ≥300 | ||||||
10 | Carbon black content% | 2.0～3.0 | ||||||
11 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||
12 | Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100
| ||||||
Oxidation induction time under the high pressure ≥400 | ||||||||
13 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥55 | ||||||
14 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥50 | ||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||
a. In 10 tests, the results of 8 times of No. 2 indicators should be greater than 0.18mm, and the minimum should be greater than 0.13mm. b. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 13 and 15 can be either tested. | ||||||||
Table 4 Low Density Polyethylene Geomembrane (GL-1 Type)
No. | Item | indicator | ||||||||
Thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≤0.939 | ||||||||
2 | （纵、横向）N/mm Tensile breaking strength (longitudinal and transverse) N/mm | ≥6 | ≥9 | ≥14 | ≥19 | ≥23 | ≥28 | ≥37 | ≥47 | ≥56 |
3 | Breaking elongation (longitudinal and transverse) % | ≥560 | ||||||||
4 | Right Angle tearing load (longitudinal and transverse) N | ≥27 | ≥45 | ≥63 | ≥90 | ≥108 | ≥135 | ≥180 | ≥225 | ≥270 |
5 | Piercing resistance strength N | ≥52 | ≥84 | ≥135 | ≥175 | ≥220 | ≥260 | ≥350 | ≥435 | ≥525 |
6 | Carbon black content% | 2.0～3.0 | ||||||||
7 | Carbon black dispersion | Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||||
8 | Oxidation induction time under the atmospheric pressure（OIT）min | ≥60 | ||||||||
9 | Impact embrittlement performance at low temperature | Passing | ||||||||
10 | Permeability indicator of water vapor g·cm/(cm2·s·Pa) | ≤1.0×10-13 | ||||||||
11 | Dimensional stability % | ±2.0 | ||||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||||
a. The two indicators of 6 and 7 are only applicable to black Geomembrane. | ||||||||||
Table 5 Linear low-density polyethylene Geomembrane for environmental protection (GL-2 type)
序 号 No. | Items | indicators | |||||||
Thickness mm | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≤0.939 | |||||||
2 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥13 | ≥20 | ≥27 | ≥33 | ≥40 | ≥53 | ≥66 | ≥80 |
3 | Breaking elongation (longitudinal, transverse) % | ≥800 | |||||||
4 | 2% secant modulus N/mm | ≤210 | ≤370 | ≤420 | ≤520 | ≤630 | ≤840 | ≤1050 | ≤1260 |
5 | Right Angle tearing load (longitudinal and transverse) N | ≥50 | ≥70 | ≥100 | ≥120 | ≥150 | ≥200 | ≥250 | ≥300 |
6 | Piercing resistance strength N | ≥120 | ≥190 | ≥250 | ≥310 | ≥370 | ≥500 | ≥620 | ≥750 |
7 | Carbon black content% | 2.0～3.0 | |||||||
8 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | |||||||
9 | （OIT）min Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100 | |||||||
Oxidation induction time under the high pressure ≥400 | |||||||||
10 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥35 | |||||||
11 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥35 | |||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | |||||||||
a. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 9 and 11 can be either tested. | |||||||||
Ⅰ.Product Types
Geomembrane is divided into: LDPE Geomembrane, LLDPE Geomembrane, HDPE Geomembrane, EVA Geomembrane, ECB Geomembrane, PVC Geomembrane, and rough-surface Geomembrane, etc.
Ⅱ.Product Functions
Seepage prevention and isolation
Ⅲ.Main applications
1、 Anti-seepage in landfills, sewage or waste residue treatment plants.
2、 River dikes, lake dams, tailings fill dams, sewage dams, reservoir areas, channels, and reservoirs (pits, mines).
3、 Subway, basement, tunnel, and anti-seepage lining of tunnels.
4、 Being used for seepage prevention of saline on roadbeds and other foundations.
5、 Horizontal anti-seepage cover in front of dyke and dam, vertical anti-seepage layer on foundation, construction cofferdam and scrap yard.
6、 Road, highway, railway foundation, and waterproof layer of expansive soil and collapsible loess.
7、 Being mainly used for roof seepage prevention in terms of houses.
Ⅳ.Thickness and deviation
Table 1 thickness and deviation of polyethylene Geomembrane (GH-1, GL-1, GL-2 type)
Item | indicator | ||||||||
Nominal thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
Average thickness mm | ≥0.30 | ≥0.50 | ≥0.75 | ≥1.00 | ≥1.25 | ≥1.50 | ≥2.00 | ≥2.50 | ≥3.00 |
Limit deviation of thickness % | -10 | ||||||||
Note: Thickness specifications and deviations not listed in the table shall be performed by interpolation. | |||||||||
Table 2 Thickness and deviation of high-density polyethylene Geomembrane (GH-2 type) for environmental protection
Items | Indicators | |||||||
Smooth surface | Nominal thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
Average thickness mm | ≥0.75 | ≥1.00 | ≥1.25 | ≥1.50 | ≥2.00 | ≥2.50 | ≥3.00 | |
Limit deviation of thickness % | -10 | |||||||
Rough surface | Nominal thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 |
≥ Deviation of average thickness % ≥ | -5 | |||||||
Limit deviation of thickness(8 out of 10) % | -10 | |||||||
Limit deviation of thickness (any one of 10)% | -15 | |||||||
Note: Thickness specifications and deviations not listed in the table shall be performed by interpolation. | ||||||||
Ⅴ.Technical performance indicator
Table 1 Ordinary high density polyethylene Geomembrane (GH-1 type)
No. | Item | indicator | ||||||||
Thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
2 | Tensile yield strength (longitudinal and transverse) N/mm | ≥4 | ≥7 | ≥10 | ≥13 | ≥16 | ≥20 | ≥26 | ≥33 | ≥40 |
3 | N/mm Tensile breaking strength (longitudinal and transverse) N/mm | ≥6 | ≥10 | ≥15 | ≥20 | ≥25 | ≥30 | ≥40 | ≥50 | ≥60 |
4 | Yield elongation (longitudinal and transverse)% | - | - | - | ≥11 | |||||
5 | Breaking elongation (longitudinal and transverse) % | ≥600 | ||||||||
6 | Right Angle tearing load (longitudinal and transverse) N | ≥34 | ≥56 | ≥84 | ≥115 | ≥140 | ≥170 | ≥225 | ≥280 | ≥340 |
7 | Piercing resistance Strength N | ≥72 | ≥120 | ≥180 | ≥240 | ≥300 | ≥360 | ≥480 | ≥600 | ≥720 |
8 | Carbon black content % | 2.0～3.0 | ||||||||
9 | Dispersion of carbon black | Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||||
10 | 间（OIT）min Oxidation induction time under the atmospheric pressure (OIT) min | ≥60 | ||||||||
11 | Impact embrittlement performance at low temperature | passing | ||||||||
12 | Permeability indicator of water vapor g·cm/(cm2·s·Pa) | ≤1.0×10-13 | ||||||||
13 | Dimensional stability % | ±2.0 | ||||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||||
Table 2 Smooth-surface high-density polyethylene Geomembrane for environmental protection (GH-2S type)
No. | Items | Indicators | ||||||
Thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≥0.940 | ||||||
2 | Tensile yield strength (longitudinal and transverse) N/mm | ≥11 | ≥15 | ≥18 | ≥22 | ≥29 | ≥37 | ≥44 |
3 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥20 | ≥27 | ≥33 | ≥40 | ≥53 | ≥67 | ≥80 |
4 | Yield elongation (longitudinal and transverse)% | ≥12 | ||||||
5 | Breaking elongation (longitudinal and transverse) % | ≥700 | ||||||
6 | Right angle tearing load (longitudinal and transverse) N | ≥93 | ≥125 | ≥160 | ≥190 | ≥250 | ≥315 | ≥375 |
7 | Piercing resistance strength N | ≥240 | ≥320 | ≥400 | ≥480 | ≥640 | ≥800 | ≥960 |
8 | Stress cracking of tensile load (Notched Constant Tensile Load Method) h | - | ≥300 | |||||
9 | Carbon black content% | 2.0～3.0 | ||||||
10 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||
11 | min Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100
| ||||||
Oxidation induction time under the high pressure ≥400 | ||||||||
12 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥55 | ||||||
13 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥50 | ||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||
a. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 11 and 13 can be either tested. | ||||||||
Table 3 Rough-surface high-density polyethylene Geomembrane for environmental protection (GH-2T1, GH-2T2 type)
No. | Items | indicators | ||||||
Thickness mm | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≥0.940 | ||||||
2 | Roughness height mm | ≥0.25 | ||||||
3 | Tensile yield strength (longitudinal and transverse) N/mm | ≥11 | ≥15 | ≥18 | ≥22 | ≥29 | ≥37 | ≥44 |
4 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥8 | ≥10 | ≥13 | ≥16 | ≥21 | ≥26 | ≥32 |
5 | Yield elongation (longitudinal and transverse)% | ≥12 | ||||||
6 | Breaking elongation (longitudinal and transverse) % | ≥100 | ||||||
7 | Right Angle tearing load (longitudinal and transverse) N | ≥93 | ≥125 | ≥160 | ≥190 | ≥250 | ≥315 | ≥375 |
8 | 抗穿刺强度N Piercing resistance strength N | ≥200 | ≥270 | ≥335 | ≥400 | ≥535 | ≥670 | ≥800 |
9 | Stress cracking of tensile load (Notched Constant Tensile Load Method) h | ≥300 | ||||||
10 | Carbon black content% | 2.0～3.0 | ||||||
11 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||
12 | Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100
| ||||||
Oxidation induction time under the high pressure ≥400 | ||||||||
13 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥55 | ||||||
14 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥50 | ||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||
a. In 10 tests, the results of 8 times of No. 2 indicators should be greater than 0.18mm, and the minimum should be greater than 0.13mm. b. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 13 and 15 can be either tested. | ||||||||
Table 4 Low Density Polyethylene Geomembrane (GL-1 Type)
No. | Item | indicator | ||||||||
Thickness mm | 0.30 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≤0.939 | ||||||||
2 | （纵、横向）N/mm Tensile breaking strength (longitudinal and transverse) N/mm | ≥6 | ≥9 | ≥14 | ≥19 | ≥23 | ≥28 | ≥37 | ≥47 | ≥56 |
3 | Breaking elongation (longitudinal and transverse) % | ≥560 | ||||||||
4 | Right Angle tearing load (longitudinal and transverse) N | ≥27 | ≥45 | ≥63 | ≥90 | ≥108 | ≥135 | ≥180 | ≥225 | ≥270 |
5 | Piercing resistance strength N | ≥52 | ≥84 | ≥135 | ≥175 | ≥220 | ≥260 | ≥350 | ≥435 | ≥525 |
6 | Carbon black content% | 2.0～3.0 | ||||||||
7 | Carbon black dispersion | Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | ||||||||
8 | Oxidation induction time under the atmospheric pressure（OIT）min | ≥60 | ||||||||
9 | Impact embrittlement performance at low temperature | Passing | ||||||||
10 | Permeability indicator of water vapor g·cm/(cm2·s·Pa) | ≤1.0×10-13 | ||||||||
11 | Dimensional stability % | ±2.0 | ||||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | ||||||||||
a. The two indicators of 6 and 7 are only applicable to black Geomembrane. | ||||||||||
Table 5 Linear low-density polyethylene Geomembrane for environmental protection (GL-2 type)
序 号 No. | Items | indicators | |||||||
Thickness mm | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 2.00 | 2.50 | 3.00 | |
1 | Density g/cm3 | ≤0.939 | |||||||
2 | Tensile breaking strength (longitudinal and transverse) N/mm | ≥13 | ≥20 | ≥27 | ≥33 | ≥40 | ≥53 | ≥66 | ≥80 |
3 | Breaking elongation (longitudinal, transverse) % | ≥800 | |||||||
4 | 2% secant modulus N/mm | ≤210 | ≤370 | ≤420 | ≤520 | ≤630 | ≤840 | ≤1050 | ≤1260 |
5 | Right Angle tearing load (longitudinal and transverse) N | ≥50 | ≥70 | ≥100 | ≥120 | ≥150 | ≥200 | ≥250 | ≥300 |
6 | Piercing resistance strength N | ≥120 | ≥190 | ≥250 | ≥310 | ≥370 | ≥500 | ≥620 | ≥750 |
7 | Carbon black content% | 2.0～3.0 | |||||||
8 | Carbon black dispersion | 。 Level 3 is not more than 1 in 10 data, and level 4 and level 5 are not allowed. | |||||||
9 | （OIT）min Oxidation induction time (OIT) min | Oxidation induction time under the atmospheric pressure ≥100 | |||||||
Oxidation induction time under the high pressure ≥400 | |||||||||
10 | 85°C heat aging (OIT retention under the normal pressure after 90d)% | ≥35 | |||||||
11 | UV resistance (OIT retention rate after 1600 hours of UV irradiation)% | ≥35 | |||||||
Note: Technical performance specifications for thickness specifications not listed in the table are required to be performed according to interpolation. | |||||||||
a. OIT (retention rate) under the normal pressure and OIT (retention rate) under the high pressure in the two indicators of 9 and 11 can be either tested. | |||||||||
