New sealant meets polysulfide/epoxy-type requirements

MAY 9, 2007 -- EP21TP-2 is a very strong two-component polysulfide/epoxy based formulation developed for high performance bonding, sealing, potting, and encapsulation.

Th 246763
Th 246763

MAY 9, 2007 -- Master Bond Inc. (search for Master Bond) says its EP21TP-2 is a very strong two-component polysulfide/epoxy based formulation developed for high performance bonding, sealing, potting, and encapsulation. It has unique optical characteristics as well, according to the company, and transmits light over a wide wavelength range, including the infra-red spectrum. It has an index of refraction of 1.58.

The developer says the EP21TP-2 bonds exceptionally well to metals, glass, ceramics, wood, vulcanized rubbers, and many plastics and readily develops a bonding strength of more than 3,000 psi at room temperature. It is designed to produce durable, high strength, tough, flexible bonds that are resistant to thermal cycling and chemicals including water, oil, fuel, and most organic solvents. EP21TP-2 is serviceable over the temperature range of -62°C to 121°C (-80°F to 250°F) and has good low-temperature flexibility, according to Master Bond.

Master Bond says EP21TP-2 can be applied without sagging or dripping even on vertical surfaces. It is relatively insensitive to mixing ratio or substrate cleaning procedures. The hardened adhesive/sealant is an electrical insulator and fully meets the requirements for polysulfide/epoxy type sealants, the company asserts.

Typical optical applications include bonding and potting fiber-optic cables, connectors, and terminations, as well as upgrading the vibration and shock resistance of electro-optic assemblies. Other applications include cementing and coating optical parts, potting LED devices, optical replications, bonding ferrules and connectors, and coating or encapsulating aerospace, fuel tank, and laser components.

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