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UV Visible spectrophotometer used for stringent quality control testing of UV cut off, Yellowness Index and Transmittance % of EVA film. UV cutoff is the main parameter to identify whether it should be used as Front EVA or Rear EVA. Transmittance and Yellowness index are the main parameters for reliabiltiy testing of solar EVA. The Δ YI yellowness index before and after a reliability test i.e., Damp Heat, UV exposure etc are strictly maintained at ≤ 3.
Transmittance, UV cutoff and yellow index are tested as per ASTM E 424 test method
Universal Testing Machine can be used to test the :
A polymer's reliability is measured in terms of retention % the above mentioned properties, an EVA's properties interms of reliability also evaluated with before and after datas of (of reliability tests) the above properties.
Applicable ASTM test methods are ASTM D 638 and ASTM D 903 for mechanical properties and adhesion testing respectively.
Gel content of EVA is the measure of degree of crosslinking in EVA. Lower the Gel content can indicate the lower degree of crosslinking, which is an serious issue in the reliability and mechanical integrity of solar module.
This gel content of EVA encapsulant can be measured by two methods, one is soxhlate and other is oven method. This is an important parameter as a part of stringent quality control tests. Though this is a time consuming test, but very important, reliable and a mandatry test in solar module or EVA manufacturing process.
The test method followed is ASTM D 2765
Lab scale laminator, to prepare samples for testing, usually A4 size modules were made for all testing, with solar glass, 2 layers of EVA and a backsheet. This laminator is also used to set the laminator recipe which will be helpful to set laminator recipe at customer end.
This laminator is mainly used for preparing samples for regular quality testing and to prepare modules for any alternate materials to test in reliability chambers.
The melt flow index (MFI) of a polymer is a measure of how easily it flows when melted. It's also known as the melt flow rate (MFR). MFI is a simple measurement of the quantity of polymer pushed through a die of specified dimensions at a set temperature within 10 min. It is frequently used to compare grades of the same polymer, as it gives an indication of the molecular weight present in that batch or grade.
A volume resistivity test measures how well a material resists the flow of electric current. It's used to determine a material's electrical conductivity. The accurate measurement of volume resistivity is essential to understanding the electrical conductivity of materials. By determining how well a coating material can resist the flow of electric current.
While volume resistivity measures the resistance to the flow of current, electrical conductivity measures how easily current flows through a material. In other words, it is the inverse of electrical conductivity. Volume resistivity is especially important in coating materials used for electrical insulation. Insulating materials like polymers or ceramics need high values to prevent electrical current leakage and ensure the circuit's integrity.
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