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Properties of Glass and Plastics

Type 1, Class A Borosilicate Glass

  • Composed primarily of silicone and oxygen, with trace amounts of boron and sodium
  • Most chemically inert composition of glass readily available for today's laboratories
  • Has an expansion coefficient of approximately 33x10-7°C

Type 1, Class B Borosilicate Glass

  • Composed of silicone and oxygen, trace amounts of boron, sodium and other elements
  • This mixture is more alkaline than Class A glass, but is adequate for many uses in the laboratory
  • All amber borosilicate glass is made of Class B unless otherwise specified
  • Has an expansion coefficient of 51x10-7°C

Properties of Plastics

  • Low-density polyethylene (L.D.P.E.) is a flexible and translucent material. This material is used to make snap caps, plug closures and selected inserts.
  • Polypropylene (P.P.) is a rigid and translucent material, which also comes in a variety of colors. Polypropylene is used for vials, selected closures, inserts and well plates.
  • Polymethylpentene (TPX) is a rigid transparent material, which has a relatively high melting point.

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