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Adhesion: (1) Basically, the adhering, clinging, bonding or sticking of two material surfaces to one another, such as rubber to rubber, rubber to glass, rubber to metal, rubber to wood, rubber to fabric, rubber to cord, rubber to wire, etc. (2) Refers to the strength of bond between cured rubber surfaces or cured rubber surface and a non-rubber surface.

Aging: To undergo changes to physical properties with age or lapse of time.

Aging, Air Oven: A means of accelerating the change in physical properties of rubber compounds by exposing them to the action of air at an elevated temperature.

Ambient Temperature: The environment temperature surrounding the object under consideration.

Blemish: A mark, deformity, or injury which impairs the appearance.

Blisters: A raised spot on the surface or a separation between layers usually forming a void or air-filled space in the vulcanized article. (See bubbles, sinks and voids.)

Bloom: A coating or efflorescence creating a discoloration or change in appearance of the surface of a rubber product caused by the migration of a liquid or solid to the surface. Examples: Sulfur Bloom, Wax Bloom. Not to be confused with dust on the surface from external sources.

Calendered: Continuously sheeted or plied up rubber compound or fabric that is frictioned or coated with rubber compound on a machine equipped with three or more heavy internally heated or cooled rolls revolving in opposite direction.

Checking: Short, shallow cracks on the surface, generally due to effect of destructive action of environmental conditions.

C. I. (Cloth-inserted): An abbreviation used to indicate a sheet of rubber containing one or more plies of cloth or duck, in which the cloth is completely covered with rubber.

Cloth Impression: Same as fabric impression.

Coating: A layer of material covering a surface.

Compression Set: The deformation which remains in rubber after it has been subjected to and released from a specific compressive stress for a definite period of time at a prescribed temperature. Compression set measurements are made for the purpose of evaluating the

creep and stress relaxation properties of rubber.

Cracking: A sharp break or fissure in the surface. Generally due to excessive strain.

Crazing: A surface effect on rubber articles characterized by multitudinous minute cracks.

Cure:The act of vulcanization.

Curing Temperature: The temperature at which the rubber is vulcanized.

Diaphragm Sheet: Sheet (generally fabricreinforced rubber) from which flat diaphragms may be cut.

Die Cut: Shaped articles punched from a sheet of rubber with a die.

Dielectric Strength: The measure of electric potential strength of a rubber product. Measure of its ability as an insulating compound to resist passage of a disruptive discharge produced by an electric stress. Measure as volts per mil of thickness.

Durometer: An instrument for measuring the hardness of rubber. Measures resistance to the penetration of an indentor point into the surface of the rubber.

Durometer Hardness: An arbitrary numerical value which measures the resistance to penetration of the indentor point of the durometer. Value may be taken immediately or after a very short specified time.

Elastomer: Macromolecular material that returns rapidly to approximately the initial dimensions and shape after substantial deformation by a weak stress and release of stress. Elongation: Increase in length expressed numerically as a fraction or percentage of initial length.

Filler: (1) A material incorporated into a rubber compound to increase its bulk. (2) A compound built into a rubber product to increase its bulk and/or improve its appearance. (3) Sometimes erroneously used to mean “filling” in textiles.

Finish, Fabric: Same as impress, fabric.

Finish, Paper: Finish resulting from curing in contact with paper.

Finish Plate or Platen: Same as plate finish (sheet).

Foreign Material: Any extraneous matter such as wood, paper, metal, sand, dirt or pigment that should not normally be present in a particular rubber product or composition.

Gauge: (1) The measure of thickness of the individual elements making up a rubber product. (2) A device for measuring. (See thickness.)

Grain: The effect on a rubber compound due to processing it through a tubing machine, calender, or mill.

Hardness: Property or extent of being hard. Measured by extent of failure of the indentor point of any one of a number of standard hardness testing instruments to penetrate the product.

Homogeneity: Uniformity of composition throughout the material.

Homogeneous:Of uniform composition throughout.

Impression: Design formed during vulcanization in the surface of any rubber article by a method of transfer, such as fabric impression or molded impression.

Impression, Fabric:Impression formed during cure by fabric wrap.

Laminated: Built up from thinner layers.

Modulus: In the physical testing of rubber, it is the ratio of stress to strain; that is, the load in pounds per square inch or kilograms per square centimeter of initial cross sectional-area necessary to produce a stated percentage elongation. It is a measure of stiffness.

Non-blooming:The absence of bloom.

Oxidation:The reaction of oxygen on a rubber product, usually detected by a change in the appearance or feel of the surface, or by a change in physical properties

Ozone Cracking:Surface cracks, checks or crazing caused by exposure to an atmosphere containing ozone. (See also ozone resistant.)

Ozone Resistant: Withstands the deteriorating effects of ozone, generally cracking.

Plate Finish (Sheet): A commercially smooth surface, the usual result of vulcanization between press plates (platens).

Ply: (1) A layer of rubberized fabric. (2) A layer consisting of multiple strands of cord or wire close spaced. (3) A single yarn in a composite yarn. (4) Used in processing as a layer of unvulcanized rubber compound.

Polymer:A very long chain of units of monomers, prepared by means of an addition and/or

condensation polymerization. The units may be the same of different. There are copolymers, di-polymers, tri or ter polymers, quadripolymers, high polymers, etc. Natural rubber is a polymer of Isoprene..

Press Length:The length of a product which can be vulcanized at one time in a press, limited to the length measurement of the press.

Random Length:A unit of material which does not fall into any current classification for standard length.

Relative Humidity:The ration of the quantity of water vapor actually present in the atmosphere to the greatest amount possible at the given temperature.

Roll:Sheet rubber and gasket material of a uniform width rolled up on itself from which gaskets and other products of lesser dimensions and various shapes may be cut.

Rubber: A material that is capable of recovering from large deformations quickly and forcibly, and can be, or already is, modified to a state in which it is essentially insoluble (but can swell) in boiling solvent, such as benzene, methyl ethyl ketone, and ethanol-toluene azeotrope.

Sinks: A collapsed blister or bubble leaving a depression in the product.

Slab: Thick sheet, generally laminated.

Specific Gravity: The ratio of the weight of a given substance to the weight of an equal volume of water at a specified temperature.

Tacky (Rubber Surface): Tending to adhere.

Tensile Strength: The maximum tensile stress applied during stretching a specimen to rupture.

Viscosity: A manifestation of internal friction opposed to mobility. The property of fluids and plastic solids by which they resist an instantaneous change of shape, i.e., resistant to flow.

Volume Swell:Increase in physical size caused by the swelling action of a liquid.

Vulcanization: Act or process of treating an elastomer or compound of same to improve its useful properties, usually accomplished by application of heat.

Warp: The yarns that run lengthwise in a woven fabric.

Waft: The crosswise threads in a fabric; filling threads. The threads or yarns running at right angle to the warp.

General properties of common polymers used in sheet rubber

Neoprene Nitrile EPDM SBR CI Pure Gum Silicone Viton Hypalon
Heat AgingGoodGoodExcellentGoodGoodGoodExcellentExcellentGood
Abrasion ResistanceExcellentExcellentVery GoodGoodGoodExcellentPoorFairFair
Compression SetFairFairFairGoodGoodGoodFairGoodGood
Flame ResistanceExcellentPoorVery PoorVery PoorVery PoorVery PoorFairGoodGood
Ozone ResistanceVeryGoodVeryPoorGoodFairFairPoorGoodExcellentExcellent
Gas Permeability ResistanceGoodGoodGoodGoodGoodGoodPoorPoorPoor
Oil ResistanceGoodVeryGoodVeryPoorPoorPoorVeryPoorFairGoodFair
Gas ResistanceGoodExcellentVeryPoorPoorPoorVeryPoorPoorPoorPoor
Acid ResistanceGoodGoodGoodFairFairGoodPoorGoodGood
Alkali ResistanceGoodGoodGoodFairFairGoodPoorGoodGood
Goodyear Rubber Products

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Instagrip Hose | Insta Lock Hose Couplings| Joint Sealant| Kanaflex Hose| Kuriyama Hose| Legris Transair Aluminum Pipe \r\nSystems | Lined Clamps | Live Swivels | Loading Arms
LPG UL 21 Delivery Hose | Marina Fuel Hose | Marina Pump Hose | Marine Exhaust Hose | Marine Hose | Marine Steering Hose | Metal Expansion Joints | Metal Hose | MCR Memphis Gloves
Micro Clamps | Microban Hoses | Mill Hose | Neptune Hose | Noshok Pressure Gauges | Nylon Tubing | Oetiker Pinch on Hose Clamps | Oil Absorbent Pads| Oil Hose| Onguard Boots
Pacific Echo Spiralite Hose | Paladin Drop Hose | Parker Brass, Composite and \r\nThermoplastic Fittings and Valves | Parker Dura-flex twin line non\r\nconductive hose | Parker Hose
Parker Hydraulic Hose and Fittings | Parker Instrumentation Fittings | Parker Liquifit | Parker Marine Steering and\r\nPower Tilt Hose | Parker Metric Fittings and Adapters
Parker Page PTFE Hose and Tubing | Parker Parflex Hose and Fittings | Parker Quick Disconnect Couplings | Parker Titan Petroleum Dock Hose | Pathfinder Belts | Parker Tube Fittings
Petroleum Hose | Piranha Sewer Cleaning Hose | Piranha Sewer Cleaning Hose | Plicord Hoses | Plylon Plus Belts | Polypropylene Tubing | Potable Water Hose | Power Transmission Belts
Power Transmission Sprockets | PVC Conveyor Belting | Pressure Gauges | PTFE Hose | Purple Snake | PVC Hose | Pyroflex Hose | Reclaimed Water Hose | Redwing Hose
Refrigerant Hose | River City Protective Clothing | RM Holz Flue Duct Expansion Joints | Roughtop Conveyor Belting | Rubber Floor Matting | Rubber Piping Expansion Joints
Sanitary Hose and Fittings | Sepco Braided Compression Packings | Sepco Mechanical Seals for pumps\r\nand rotating equipment | Sewer Hose | Sheet Rubber | SilentSync Belts
Silica High Temperature Cloth | Silicone Rubber Sheet | Silicone Hose | Smart Seal Clamps | Snaptite Fire Hose | Spiraflex Hose | Spectra Poseidon Hose | Stainless Clamps | Steel Air Hose
Super Swivel| Super Torque Belts | Survivor Hose Compound | Syncrochain Belts | T-Bolt Clamps | Teflon Hose | Tetraglas Welding Cloth | Thermoseal Klinger C-4401 Gasket Sheet
Tift Willcox Marine Master Composite Hose | Tri Clover Sanitary Hose Couplings | Titan Hose | Tridon Clamps | Twin Hammer Hose | Urethane Hose | Urethane Tubing | Vacuum Gauge
Vapor Recovery Hose | V Belts | Velocity Water Hose | Versafuel | Versiflo Hoses | Vintner | Vintner Reserve | Viton Sheet | Webstone Ball Valves | Wave Seal Clamps | Wine Hose
Wormgear Clamps