Glossary

Helpful industry terms

AECA

AECA: The Arms Export Control Act provides the authority to control the export of defense articles and services.

Bond

Bond: Uniting materials by using an adhesive.

Butyl

A elastomer used in applications requiring airtight rubber. This material is used in many applications such as inner tubes, adhesives, fuel additives, caulks, sealants.

Chloroprene

A synthetic rubber that is resistant to oils and chemicals. It also has fire suppressive capabilities. It is reliable for outdoor use, serving a variety of industrial applications.

Compound

Mixture of a polymer with the essential materials needed to create a finished article.

Compression Set

The deformation a material retains after removal of the compressive stress.

Durometer
      • Measures the indentation hardness of rubber.
Ethylene­Propylene­Diene Rubber (EPDM)

A synthetic material that has a variety of uses because of its durability EPDM is used in hoses, tubing, insulation along with other industrial and automotive applications.

Elastomer

Rubber or a synthetic substances resembling rubber.

Elongation

How long a test piece can be stretched beyond its original length before breaking under stress.

Fluoroelastomer

A fluorocarbon­based synthetic rubber with a wide chemical resistance and superior performance, especially in high temperatures.

Fluorosilicone

A special form of silicone rubber that has excellent resistance towards oils, chemicals, heat and the outdoors.

Hydrogenated Nitrile (HNBR)

A rubber known for its strength and retention of properties after long­term exposure to heat, oil and chemicals, making it ideal for industrial and automotive applications.

Hypalon

A trademark name for chlorosulfonated polyethylene synthetic rubber noted for its resistance to chemicals, temperature extremes, and ultraviolet light.

IAQG

The International Aerospace Quality Group is a cooperative global organization involved with aviation, space and defense companies.

ITAR

International Traffic in Arms Regulations regulates the export and import of defense related articles and services.

Latex

A stable dispersion (emulsion) of polymer microparticles in an aqueous medium. Most notably is natural rubber, made from the sap of rubber trees.

Molding

Molding is accomplished by forcing a polymer into a shape using heat and pressure. Rubber and elastomers can be molded by compression, transfer and injection methods.

Platen

A plate in a vulcanizing press that compresses and heats a mold containing an elastomer.

Polyisoprene

A polymer that is sometimes called “synthetic natural rubber”, used as a natural rubber substitute and to make natural latex free rubber products.

Polymer

A compound with a molecular structure in which any number of similar polyatomic units are bonded together.

Polyurethane

Polyurethane elastomers are based on the poly-addition of diol-ester (AU) or diol-ethers (EU) with diisocyanate. Diol-ethers offer better hydrolysis resistance and diol-esters give better oil resistance. Polyurethane elastomers present excellent characteristics abrasion resistance, good elasticity and
toughness with high hardness and good low temperature characteristics.

Rebound Testing

A method of determining the resilient properties of vulcanized rubber.

Resilience

The ability of a material to absorb energy when it is deformed elastically, and release that energy upon unloading.

Rubber

Natural or synthetic rubber modified by chemical treatment to increase its useful properties, such as toughness and resistance to wear. Uses include tires, electrical insulation, and waterproof materials.

SBR

See Styrene­Butadiene

Silicone

Polymers made up of repeating siloxane units, i.e. a functional group of two silicon atoms and one oxygen atom frequently combined with carbon and/ or hydrogen. They are typically heat-resistant and rubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation.

Specific Gravity

Also called relative density is the ratio of the density of any substance to the density of a standard substance, water being the standard for liquids and solids.

Styrene­Butadiene

A rubber with limited heat and oil resistance used in basic automotive tires.

Tensile Modulus

The measure of stiffness of an elastic material. It is used to describe the elastic properties of objects like wires, rods or columns when they are stretched or compressed.

Tensile Strength

The amount of resistance an elastomer has towards rupture while being stretched.

Ultimate Elongation

A measure of how far a material will stretch before breaking; expressed as a percentage of its original length.

Vamac®

An acrylic elastomer with excellent resistance to heat and chemicals.

Viscosity

Thickness, or a measure of how resistant a liquid is to flowing.

Vulcanization

A chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives.” These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains..

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