Insulating back sheet for crystalline silicon terrestrial photovoltaic (PV) modules
1 Scope
This standard specifies the classification, requirements, test methods, inspection rules, packaging, marking, transportation and storage of insulating back sheet for crystalline silicon terrestrial photovoltaic (PV) modules.
This standard is applicable to insulating back sheet for crystalline silicon terrestrial photovoltaic (PV) modules (hereinafter referred to as "back sheet").
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 191-2008 Packaging - Pictorial marking for handling of goods
GB/T 1408.1-2006 Electrical strength of insulating materials - Test methods - Part 1: Tests at power frequencies
GB/T 1410-2006 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
GB/T 2423.3-2006 Environmental testing for electric and electronic products - Part 2: Testing method test Cab: Damp heat steady state
GB/T 2423.17-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
GB/T 2790-1995 Adhesives, 180° peel strength test method for a flexible-bonded-to-rigid test specimen assembly
GB/T 3979-2008 Methods for the measurement of object color
GB/T 7921-2008 Uniform color space and color difference formula
GB/T 8808-1988 Test method for peel force of flexible laminated plastics
GB/T 9286-1998 Paints and varnishes - Cross cut test for films
GB/T 13542.2-2009 Film for electrical insulation - Part 2:Methods of test
GB/T 16935.1-2008 Insulation coordination for equipment within low-voltage systems - Part 1: Principles requirements and tests
GB/T 21529-2008 Determination of water vapour transmission rate for plastic film and sheeting - Electrolytic detection sensor method
GB/T 23988-2009 Determination for abrasion resistance of coatings by falling abrasive
GB/T 23989-2009 Determination for the solvent resistance of coatings by solvent rubs
GB/T 26253-2010 Determination of water vapour transmission rate for plastics-film and sheeting - Infrared detection sensor method
IEC 61215:2005 Crystalline silicon terrestrial photovoltaic (PV) modules - Design qualification and type approval
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Water vapor transmission rate; WVTR
amount of water vapor passing through per unit area of specimen per unit time under specific conditions, g/(m2· d)
4 Product classification
The back sheet protects and supports crystalline silicon terrestrial photovoltaic (PV) modules, and has reliable insulation, hydrolysis resistance, ultraviolet resistance, electrical and thermal aging resistance. Generally, it has a three-layer structure: the protective layer of the outer fluorine film [polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), etc.] and fluorine coating [tetrafluororesin (PTFE), trifluorochloroethylene resin (CTFE), etc.] has good environmental corrosion resistance; its intermediate layer is usually polyester (PET) film, which has good insulating performance. Its inner layer is fluorine film or fluorine coating, and the copolymer of ethylene and vinyl acetate (PEVA), which has good adhesion performance.
At present, back sheet products are mainly classified into the following types according to their production process:
1) Compound type (including melt bonding type): the back sheet by compounding fluorine film (PVF, PVDF, etc.) on both sides of PET base film; or the back sheet prepared by compounding fluorine film on one side of PET base film and PEVA adhesive film or other film materials on the other side;
2) Coating type: Through proper coating process, the fluorine-containing coating is coated on the surface of PET base film on both sides, or coated on the surface of PET base film on one side and compounded with PEVA adhesive film or other film materials on the other side, so as to prepare a back sheet with performance similar to that of the composite type.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, transportation and storage
