Full Description

Scope:

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take

precedence.

1.1 Purpose/Material Description. This specification describes material types of Polycarbonate (PC) that offer

exterior weather resistance without the aid of a protective coating. Materials approved to this specification shall

meet the requirements of GMW1 4650 Class 1 . This specification is based on GMW301 3 per ISO 21 305-1 /2

recommendations.

1.1.1 Types. There are multiple types within this specification intended for different applications, distinguished

by suffix and type number; properties are described in Table 1 and Table 2 and in the following. Suffix generally

denotes differences in the polymer chemistry, while Type number generally denotes varying melt flow index.

• Several types from the aromatic PC copolymer family of resins may be specified:

1 . Low Flow Rate, High Molecular Weight Resin, Type 2, suffix CO-T2.

2. Medium Flow Rate, Medium Molecular Weight, Type 3, suffix CO-T3.

3. High Flow Rate, Low Molecular Weight, Type 4, suffix CO-T4.

• Several types from the aromatic PC homopolymer family of resins may be specified:

1 . Medium Flow Rate, Medium Molecular Weight Resin, Type 3, suffix HP-T3.

2. High Flow Rate, Low Molecular Weight Resin, Type 4, suffix HP-T4.

3. Higher Flow Rate, Lower Molecular Weight Resin, Type 5, suffix HP-T5.

• One (1 ) type from the aliphatic isosorbide PC homopolymer family of resins may be specified:

1 . Low Flow Rate, High Molecular Weight Resin, suffix AI-T2.