Compound types

Thermosetting Compounds (without fibers):

• Based on various elastomers (synthetic rubbers)
• Isoprene, Nitrile, EPDM, Fluoroelastomer (Viton)
• Compound is injected in the uncured state
• Process heat causes the elastomer to cure
• Changes from a visco-plastic material to a hyper-elastic material
• Compound formulation includes a sulphur or metal oxide based cure system
• Soft easy-flowing compounds based on thermally cured silicone rubber

Thermosetting Compounds (fiber reinforced):

• Based on various elastomers (synthetic rubbers) with fiber reinforcement
• Based on various natural resins with fiber reinforcement
• Based on phenolic resin with fiber reinforcement

Non-Curing Compounds and Packing:

• Based on fibers and carriers

PTFE Based Compounds:

• Polytetrafluoroethylene (PTFE) is highly inert and resistant to most chemicals

Low Viscosity RTV Silicone Based Compounds:

• Two part chemically curing (room temperature vulcanized – RTV) silicone compounds and sealants
• One part moisture cured silicone compound and sealants.

Ceramic Compounds:

• For use at extremely high temperatures
• Use at very high temperatures is dependent on being able to inject the compound to the required position before it sets hard

Resins:

• Chemically curing two (or three) part Epoxy of Polyurethane Resins
• Not generally suitable for sealing live leaks
• Sometimes used for filling enclosure clamps
• Epoxy resins cure to a very hard material
• Polyurethane resins cure to a high durometer elastomer

Nuclear Compounds:

• Special requirements for compounds often apply for use in nuclear environments
• Nuclear grade compound is manufactured to very strict quality control standards with chemical analysis of raw materials and finished compound
• Nuclear grade compounds are certified to contain below specified trace amounts of certain elements
• Peroxide based cure system is used for thermosetting elastomeric compounds