Properties and Applications of Buna N and Neoprene
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Questions and Answers

Buna S is a copolymer of ______ and styrene

butadiene

GR-S is the abbreviation of Government Rubber ______

Styrene

Buna S can be vulcanized with ______ and cured to a hardness equal to hard rubber

sulfur

Buna S must be compounded with a black pigment such as ______ to bring out its best physical properties

<p>carbon black</p> Signup and view all the answers

Buna S is the synthetic rubber normally used for tires and tubes as a substitute for ______

<p>natural rubber</p> Signup and view all the answers

Buna N is a copolymer of butadiene and ______

<p>acrylonitrile</p> Signup and view all the answers

Buna N can be vulcanized with ______ and can be cured to hard rubber

<p>sulfur</p> Signup and view all the answers

Buna N has excellent resistance to ______

<p>oil</p> Signup and view all the answers

Buna N will resist heat up to ______

<p>250°F</p> Signup and view all the answers

Buna N is sometimes referred to as ______ rubbers

<p>nitrile</p> Signup and view all the answers

Study Notes

Synthetic Rubber Properties

  • Buna N stiffens at -45°F, has good abrasion resistance, and good "breakaway" properties when used in contact with metal.
  • It is adversely affected by ozone and sunlight, but its properties are improved by the addition of carbon black.

Buna N Applications

  • Buna N is used for oil and gasoline hose, tank linings, hydraulic accumulator bags, gaskets, and seals.

Neoprene Properties

  • Neoprene is a polymer of chloroprene, has good resistance to oil, and excellent resistance to heat, air, light, and flame.
  • It has better light resistance than any other rubber.
  • It can be vulcanized without sulfur but cannot be cured to as hard a condition as hard rubber.

Neoprene Applications

  • Neoprene is used for oil-resistant hose, carburetor diaphragms, gaskets, shoe soles, barrage balloons, truck tires, cements, tape, and caulking.

Butyl Properties

  • Butyl is a copolymer of isobutylene and small amounts of unsaturated hydrocarbons, has excellent gas impermeability, and can be vulcanized with sulfur.
  • It cannot be hardened to the condition of hard rubber.

Butyl Applications

  • Butyl is used for gas masks, plywood molding bags, life jackets, and chemical storage, and may become the first-choice material for tire tubes.

Thiokol Properties

  • Thiokol is a polysulfide polymer, has the highest resistance to deterioration, and is particularly noted for its resistance to aromatic hydrocarbons and aromatic blended gasolines.
  • It can be vulcanized with zinc oxide but not to a hardness comparable with hard rubber.

Thiokol Applications

  • Thiokol is used for oil hose, tank linings for aromatic aviation gasolines, paint spray hose, gaskets, and seals.

Buna S Properties

  • Buna S is a copolymer of butadiene and styrene, can be vulcanized with sulfur and cured to a hardness equal to hard rubber.
  • It must be compounded with a black pigment such as carbon black to bring out its best physical properties.

Buna S Applications

  • Buna S is the synthetic rubber normally used for tires and tubes as a substitute for natural rubber, and can be used to replace rubber in most applications.

Aircraft Plastics

  • Plastics are a large group of synthetic and natural organic materials which can be molded under heat and pressure, cast, extruded, or fabricated into a variety of shapes.
  • Plastics have been used in many aircraft applications, such as knobs, handles, paneling, and similar items.

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Description

Learn about the properties and applications of Buna N and Neoprene synthetic rubbers, including their resistance to extreme temperatures, abrasion, and contact with metal. Discover how these materials are used in hydraulic systems, tank linings, gaskets, and more.

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