Inhibitor

A chemical added in small amounts to a reactive resin to delay the onset of cure, extending shelf life and working time and protecting against premature gelation in storage or transport. Adjusting inhibitor level is one of the ways manufacturers tune the gel time of polyester and vinyl ester resins.

Related terms

Accelerator

An additive that speeds the cure of a resin or adhesive, allowing curing at lower temperatures or in shorter times. Cobalt salts are the usual accelerators for polyester resins, working in combination with the peroxide catalyst; pre-accelerated resins have the accelerator already blended in by the manufacturer.

Resins & adhesivesAutomotiveConstructionMarineGreen energyIndustrial

Gel time

The time taken for a mixed resin to change from a workable liquid to a soft gel that can no longer be applied or moved. It marks the practical end of the working period and is quoted by resin suppliers at a stated temperature and catalyst addition.

Resins & adhesivesAerospaceAutomotiveConstructionMarineGreen energyIndustrial

Pot life

The length of time a mixed, reactive resin or adhesive remains usable in the mixing vessel before it thickens beyond application. Pot life shortens as temperature and mixed quantity increase, because the curing reaction generates its own heat.

Resins & adhesivesAerospaceAutomotiveConstructionMarineGreen energyIndustrial

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