Diaphragm Design Manual - Simrit

Replasticize – The act of making a “dry” rubber part soft again. Normally refers to diaphragmsthat contact gasoline intermittently. Without fuel contact they can become dry and stiff due toloss of oils but become soft and pliable again with fuel contact.Resilience – The energy returned by vulcanized rubber when it is suddenly released from astate of strain or deformation.Reversion – The softening of some vulcanized rubbers when they are heated too long, usuallyaccompanied by an increase in extensibility, a decreasing in tensile strength and a lowering ofthe stress required producing a given elongation. Extreme reversion may result n tackiness; therubbers “revert” to unvulcanized, then to a non-polymeric condition.Rheology – The science of deformation and flow of matter. Deals with the laws of plasticity,elasticity and viscosity and their connections with paints, plastics, rubber, oils, glass, cement, etc.Scorching – A term frequently used to denote premature vulcanization of a rubber compoundoccurring on a mill or calendar, or in an extruder.Tensile Strength – The capacity of a material to resist a force tending to stretch it. Ordinarilythe term is used to denote the force required to stretch a material to rupture, and is known asbreaking load, breaking stress, ultimate tensile strength.Under cure – Degrees of cure less than optimum. May be evidenced by tackiness, loginess(lack of snap or resilience), or inferior physical properties.Vulcanizing Agent – Any material, which can produce in rubber the change in physicalproperties known as vulcanization, such as sulfur, polysulfides, organic polynitro derivatives,peroxides and quinone dioximes.Warp – The fabric strands that run along the length of a roll of woven fabric 90 o to the Fill.Sometimes referred to as the Warp Direction.© Copyright FNGP 200954