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• GPI refers to the "Glass Packaging Institute"

• The GPI is responsible for establishing and issuing standards for the types and finishes produced by American glass manufacturers.

• GPI refers to the "Glass Packaging Institute"

• The GPI is responsible for establishing and issuing standards for the types and finishes produced by American glass manufacturers.

Typical GPI finishes found in the chromatography field are as follows:

• GPI refers to the "Glass Packaging Institute"

• The GPI is responsible for establishing and issuing standards for the types and finishes produced by American glass manufacturers.

• GPI refers to the "Glass Packaging Institute"

• The GPI is responsible for establishing and issuing standards for the types and finishes produced by American glass manufacturers.

• Borosilicate - A glass that is high in silicate and having at least 5% boron oxide.

• Linear Coefficient of Expansion - Fractional change in length of glass per degree change in temperature.

• Strain Point - Maximum temperature to which glass should be heated during use"

Types of Glass:

• USP Type - Pharmaceutical glass containers can be classified as USP Type I, II, III or NP.

• Type I - Borosilicate glass represents the least reactive glass.

• Type I glass has the least pH shift. (Lowest leaching characteristics) Coefficient of Expansion = 33 or 51 for Clear and 51 for Amber

• Type II - is de-alkalized soda lime glass with higher levels of sodium hydroxide and calcium oxide.

• Type III - soda lime glass - cannot be autoclaved.

• Type NP - general purpose soda-lime glass used where chemical durability and heat shock are not factors.

• Coefficient of Expansion = 92.

Plastic Properties