Silicone encapsulant from Wacker flexes with thin film PV

WACKER introduced a solar cell silicone encapsulant that laminates flexible thin-film modules via roll-to-roll processing and resists yellowing, stiffening, and outgassing in the field.

August 11, 2011 — WACKER introduced a solar cell silicone encapsulant that laminates flexible thin-film photovoltaics modules via roll-to-roll processing.

ELASTOSIL Solar 2200 is transparent, pourable and non-corrosive. The product offers chemical and mechanical stress protection to thin film solar panels.

Roll lamination allows thin film solar cell makers to apply the silicone encapsulant, feed the front film and vulcanize the silicone rubber in a continuous, automated step.

Adhesive additives enable the silicone to bond to glass and flexible films made from a variety of materials including aluminum, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), or activated ethylene tetrafluoroethylene copolymer (ETFE) without a primer.

The product can be left at room temperature for long processing times, then vulcanized rapidly in heat, bonding composite layers into a stable laminate with a moisture barrier.

ELASTOSIL Solar 2200 is electrically insulating and permanently flexible in -50° to +200°C.

The silicone formula does not yellow under weather and sun exposure and it does not release any corrosive substances.

WACKER produces hyperpure polysilicon and silicone potting materials, adhesives, sealants, and encapsulants for solar cells and modules. The company also makes ELASTOSIL Solar 2120 UV encapsulant. Learn more at

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