Sheet molding compound (SMC) for general purposes
1 Scope
This standard specifies the classification and labeling, requirements, test methods, inspection rules, marking, packaging, transport and storage, etc. of sheet molding compound (hereinafter referred to as SMC) for general purposes.
This standard is applicable to the sheet molding compound (SMC) for general purposes compound of glass fiber reinforced unsaturated polyester resin.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the document referred to applies.
GB/T 1446 Fiber-reinforced plastics composites - The generals for determination of properties
GB/T 1449 Fiber-reinforced plastic composites - Determination of flexural properties
GB/T 1451 Fiber-reinforced plastics composites - Determination of Charpy impact properties
GB/T 4609 Test method for flammability of plastic
GB/T 8924 Test method for flammability characteristics of fiber reinforced plastics - Oxygen index method
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
sheet molding compound (SMC)
sheet compound composed of thickening resin, chopped (and/or continuous) glass fiber reinforced material, filler, auxiliary agent and other materials, with the upper and lower surfaces covered with bearing film
3.2
sheet molding compound (SMC) for general purposes
SMC with unsaturated polyester resin and glass fiber as main raw materials
4 Classification and labeling
4.1 Classification
According to mechanical properties, SMC can be divided into three types: M1, M2 and M3.
According to shrinkage properties, SMC can be divided into four types: S1, S2, S3 and S4.
According to combustion properties, SMC can be divided into four types: F1, F2, F3 and F4.
4.2 Labeling
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and labeling
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transport and storage
Annex A (Normative) Test method of the fiber content of SMC
Annex B (Normative) Test method of mass per unit area of SMC
Annex C (Normative ) Test method of SMC molding shrinkage rate
