Optically Clear Epoxy for Demanding Applications

Master Bond's new EP37-3FLF polymer system has been developed for demanding applications where flexible, impact-resistant bonds are required. This optically clear, two-component epoxy offers excellent resistance to cryogenic temperatures and severe thermal cycling, according to the company. Its low exotherm also makes it suitable for potting, encapsulating and casting, especially where wider cross-section thicknesses are specified. Its combination of properties allows it to cure without stressing delicate electronic components.

Serviceable over the wide range of 4K to 250F, the EP37-3FLF system cures at room temperature in two to three days or faster at elevated temperatures. This epoxy offers a non-critical 1:1 mix ratio by weight or volume and a low mixed viscosity of 1,400cps to 1,500cps. In addition, users can work with a 100g mass of the adhesive at room temperature for up to 90 minutes. The EP37-3FLF has a bond shear strength exceeding 2,000psi and a T-peel strength of 25pli.

This flexible epoxy has an elongation of 180 per cent and excellent electrical insulation properties with a volume resistivity of 1 x 1,014ohm-cm. It bonds well to a variety of substrates, including metals, glass, ceramics, rubbers and many plastics, and is widely used in the optical, electrical, electronic, computer and OEM industries. The EP37-3FLF is sold in pint-, quart-, gallon- and five-gallon-container kits and has a six-month shelf life if unopened and stored at room temperature.

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