Rubber Molding Terms
Abrasion Resistance - A rubber compound's capability to withstand mechanically caused deterioration.
Accelerated Life Test - A test made to replicate in a short period of time the breakdown resulting from normal working conditions.
Accelerator - A substance that increases the speed of vulcanization when used in small quantities in conjunction with vulcanizing agents.
Activator - A compound used to increase the effectiveness of an accelerator, small amounts at a time.
Adhesion - Tendency of rubber to cling or bond to any surface it contacts.
Aftercure - The continuance of vulcanization, even after the energy source has been taken away.
Air Checks - Depressions and marks on the surface of rubber, caused by air trapped during the molding process.
Autoclave - Uses steam under pressure to vulcanize rubber products.
Backrind - A defect in the molding process, where the rubber near the parting line sinks below the surface and the parting line ends up ragged and torn.
Batch - The result of a mixing operation.
Blank - Rubber compound that fills a mold.
Bloom - A discoloration of rubber, caused by a liquid or solid migrating towards the surface.
Breakout Friction - The necessary force to start the sliding between a rubber seal and its mating surface.
Chalking - The development of a powdery residue on a rubber surface as a result of surface breakdown.
Checking - Small cracks on the surface of rubber, usually from environmental damage.
Compression Set - The permanent deformation of rubber after removing the compression.
Conducting Rubber - Rubber that is able to conduct electricity.
Crosslink - A chemical bond between polymer chains.
Cure Date - The date of completion of the molding process for a rubber product.
Deflashing - Any of a variety of processes for waste edge removal from molded rubber parts.
Dispersion - The application of force used to evenly disperse various compounds through rubber.
Durometer - An instrument that measures the hardness of rubber.
Dusting - Applying powder to rubber to prevent adhesion to something else.
Dynamic Seal - A seal necessary for the prevention of leaks beyond parts that are in relative motion.
Elasticity - A characteristic of rubber, describing its tendency to return to its initial shape after warping.
Elongation - Extension of rubber when exposed to stress.
Extruder - A machine that forces rubber through a hole that shapes it into the finished product.
Fatigue Breakdown - The wearing out of elastomers after repeated deformations.
Flexural Strength - The flexing capability of a material with no permanent deformation or breakage.
Flow - Capability of uncured rubber to move in the mold and runner system in the molding procedure.
High Consistency Rubber (HCR) - Rubber processed on a rubber mill that has a much greater viscosity than liquid silicone rubber.
Hysteresis - The process of mechanical energy changing to heat in rubber under strain.
Insert - A material that rubber is chemically or physically bonded to during the molding process.
Logy - Slow recovery rate of rubber after stress.
Mastication - The softening of raw rubber by mechanical and atmospheric forces.
Monomers - A chemical compound that is able to endure polymerization.
Non-Fill - A defect that occurs when the rubber does not completely fill out the mold.
Parting Line - A line on the surface of rubber resulting from where the two halves of the mold met.
Peptizer - A material that is used to quicken the softening of rubber compounds under heat or mechanical action.
Pigment - An insoluble compound that gives rubber its color.
Plasticity - The degree to which rubber will retain deformation.
Polymerization - Chemical reaction in which one or more simple materials are transformed into complex materials that have different properties from the originals.
Reinforcing Agent - A substance that is added to rubber to increase its resistance to the harms of the vulcanization process.
Scorch - The result when rubber vulcanizes too quickly.
Spew - Extra material that leaks from the mold as it closes.
Splice - The term for the uniting of two parts of vulcanized rubber to make a whole.
Vulcanization - A thermo-setting reaction that involves the use of pressure and heat, and results in highly increased elasticity and strength of materials like rubber.
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