GB/T 12670-2008 Polypropylene (PP) resin
1 Scope
This standard specifies the classification and designation, requirements, test methods, inspection rules, marking, packaging, transportation and storage of polypropylene (PP) resin (PP resin).
This Standard applies to particulate propylene homopolymer (PP-H), propylene impact copolymer (PP-B) or propylene random copolymer (PP-R) containing additives prepared by polymerization of propylene or propylene/ethylene under the action of catalysts.
This Standard is not applicable to colored, filled, modified and mixed PP resin and masterbatch materials.
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) to, 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 normative documents indicated below. For undated references, the latest edition applies.
GB/T 1040.2-2006 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2:1993, IDT)
GB/T 1250-1989 Rules for expression and judgment of limiting values
GB/T 1634.2-2004 Plastics - Determination of temperature of deflection under load - Part 2: ebonite and long-fibre-reinforced composites (ISO 75-2: 2003,IDT)
GB/T 2410-1980 Transparent plastics - Transmissivity and haze test methods
GB/T 2412-1980 Polypropylene - Method of determination of normal indices
GB/T 2546.1-2006 Plastics - Polypropylene(PP) moulding and extrusion materials - Part 1: Designation system and basis for specifications (ISO 1873-2: 1997, MOD)
GB/T 2546.2-2003 Plastics - Polypropylene(PP) moulding and extrusion materials - Part 2: Preparation of test pieces and determination of properties (ISO 1873-2: 1997, MOD)
GB/T 2547-1981 Plastic resins - Sampling
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing (ISO 291: 1997, IDT)
GB/T 3682-2000 Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics (idt ISO 1133: 1997)
GB/T 6595-1986 Test method for fish eye count of polypropylene resin
GB/T 9341-2000 Plastics - Determination of flexural properties (idt ISO 178: 1993)
GB/T 9342-1988 Plastics - Determination of hardness by the ball indentation method (eqv ISO 2039-2: 1981)
GB/T 9345 Plastics- Determination of ash - General methods (GB/T 9345-1988, idt ISO 3451-1:1981)
GB 9693 Hygienic standard for polypropyrene resin used as food packaging material
GB/T 17037.1-1997 Plastics - Injection moulding of test pieces of thermoplastic materials - Part 1: General principles, and moulding of multipurpose and bar test pieces (idt ISO 294-1: 1996)
GB/T 17037.3-2003 Plastics - Injection moulding of test pieces of thermoplastic materials - Part 3: Small plates (idt ISO 294-3: 2000)
GB/T 17037.4-2003 Plastic - Injection moulding of test pieces of thermoplastic materials - Part 4: Determination of moulding shrinkage (idt, ISO 294-4: 2000)
SH/T 1541-2006 Test method for appearance of thermoplastic granules
ISO 179-1：2000 Plastics - Determination of Charpy impact properties - Part 1: Non-instrumented impact test
3 Classification and designation
The classification and designation of polypropylene (PP) resins shall comply with GB/T 2546.1-1999.
For the designation purpose, polypropylene resin of each grade shall have nominal values for tensile modulus of elasticity and notched impact strength of notch impact strength of simply supported beam.
Example: an injection-moulded (m) polypropylene homopolymer (PP-H) resin is natural color (N, which may be omitted) particles (G, which may be omitted) with the nominal value of tensile modulus of elasticity of 123 × 10 MPa (123), and the nominal value of notch impact strength of simply supported beam of 3.6 k/m2(04), the nominal value of the melt mass flow rate MFR of 1.5 g/10 min (015), and the test conditions are: temperature 230℃, under the load 2.16 kg (M, which may be omitted). The material is designated as follows:
Foreword i
1 Scope
2 Normative References
3 Classification and designation
4 General requirements
5 Requirements
6 Test method
7 Inspection rules
8 Marking
9 Packaging, transportation and storage
