A surface effect on rubber articles characterized by many minute cracks.
The act of vulcanization.
A compact, firm, heavy, plain weave fabric made from cotton or synthetic fibers, or a combination of both. Duck is also known as canvas, army duck, belt duck harvester duck, hose duck and shoe duck.
An instrument for measuring the hardness of vulcanized rubber and plastic.
An arbitrary numerical value which measures the resistance to indentation of the blunt indentor point of a durometer. Value may be taken immediately or after a very short specified time.
Generic term for all natural and synthetic material that express elastic properties. Extrusion Production of a length of rubber tubing with a specific profile by pushing it through a die. In the case of rubber bands, producing a tube with a specific inner and outer diameter.
An increase in length expressed numerically as a fraction or percentage of the initial length.
General term used for bulk materials added to a compound.
A cracking condition of the surface of rubber articles such as tires and footwear, resulting from constantly repeated bending or flexing in service.
A gasket covering the entire flange surface and drilled with bolt holes.
A synthetic rubber produced by polymerization of chloroprene and used in weather-resistant products, adhesives, shoe soles, sportswear, paints, and rocket fuels.
The difference between the amount of energy absorbed when rubber is stretched and the amount of energy released when it is then relaxed.
Heat or radiation treatment, or both, to which a cured or partially cured thermosetting plastic or rubber composition is subjected to enhanced the level of one or more properties.
Rebound is a measure of the resilience, usually as the percent- age of vertical return of a body which has fallen and bounced.
(1) A deterioration of physical properties that may occur upon excessive vulcanization of some elastomers, evidenced by a decrease in hardness and tensile strength, and an increase in elongation; (2) A similar change in properties after air aging at elevated temperatures. Natural rubber, butyl, polysulfides and epichlorobydrin polymers exhibit this effect (extreme reversion may result in tackiness). Most other polymers will harden and suffer loss of elongation on hot air aging.
Root Mean Square – The measure of surface roughness, obtained as the square root of the sum of the squares of micro-inch deviation from true flat.
A material that exhibits elastic properties that allow recovery from large deformations quickly and forcibly. A tough, waterproof substance obtained through polymeric synthesis or in natural form from the sap of various species of plants or trees.
Colloidal aqueous emulsion of an elastomer.
Styrene Butadiene Rubber
Shore A Hardness
An indentation method of rating the hardness of rubber using a Shore Durometer with the A scale from 0 to 100.
Any of a group of semi-inorganic polymers based on the structural unit R2SiO, where R is an organic group, characterized by wide-range thermal stability, high lubricity, extreme water repellence, and physiological inertness and used in adhesives, lubricants, protective coatings, paints, electrical insulation, synthetic rubber, and prosthetic replacements for body parts.
A relatively dense layer at the surface of a cellular material.
A soft, porous rubber used in toys, cushions, gaskets, and weather stripping and as a vibration dampener.
Rubber that does not require chemical vulcanization and will repeatedly soften when heated and stiffen when cooled; and which will exhibit only slight loss of its original characteristics.
Chemically vulcanized rubber that cannot be re-melted or remolded without destroying its original characteristics.
An irreversible process during which a rubber compound through a change in its chemical structure (for example, cross-linking) becomes less plastic and more resistant to swelling by organic liquids and elastic properties are conferred, improved, or extended over a greater range of temperature.