Why EPDM as rubber in the solar mounting systems?
When comes with isolation, watertight purpose in solar mounting structures, there comes EPDM rubber.
EPDM rubber (ethylene propylene diene monomer rubber), is a type of synthetic rubber, which can be used in a wide range of applications. This is an M-Class rubber where the ‘M’ in M-Class refers to its classification in ASTM standard D-1418; the M class comprises elastomers having a saturated chain of the polyethylene type (the M deriving from the more correct term polymethylene). EPDM is made from ethylene, propylene and a diene comonomer that enables crosslinking via sulfur vulcanization systems. The earlier relative of EPDM is EPR, ethylene-propylene rubber, which contains no diene units and can only be crosslinked using radical methods such as peroxides. Dienes used in the manufacture of EPDM rubbers are ethylidene norbornene (ENB), dicyclopentadiene (DCPD), and vinyl norbornene (VNB).
Rubbers with saturated polymer backbones, such as EPDM, have much better resistance to heat, light, and ozone compared to unsaturated rubbers such as natural rubber, SBR or polychloroprene (Neoprene). As such, EPDM can be formulated to be resistant to temperatures as high as 150°C, and, properly formulated, can be used outside for many years or decades without degradation. EPDM has good low-temperature properties, with elastic properties to temperatures as low as -40°C depending on the grade and the formulation.
In Solarcks, we use new material from 3M, can meet the best standard of the industry.
|Coefficient of thermal expansion, linear||160 µm/(m·K)|
|Maximum service temperature||150 °C|
|Minimum service temperature||−50 °C|
|Glass transition temperature||−54 °C|