GB/T 37881-2019 English PDF (GB/T37881-2019)

GB/T 37881-2019: Plastics - Long Glass Fiber Reinforced Polypropylene (PP) Compound for Automotive
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GB/T 37881-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
G 32
Plastics - Long Glass Fiber Reinforced Polypropylene
(PP) Compound for Automotive
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Classification and Designation ... 5 
5 Requirements ... 7 
6 Test Methods ... 8 
7 Inspection Rules ... 11 
8 Marking, Packaging, Transportation and Storage ... 13 
Plastics - Long Glass Fiber Reinforced Polypropylene
(PP) Compound for Automotive
1 Scope
This Standard stipulates the terms, definitions, classification, designation,
requirements, test methods, inspection rules, marking, packaging, transportation and
storage of long glass fiber reinforced polypropylene (PP) compound for automotive.
This Standard is applicable to long glass fiber reinforced polypropylene (PP)
compound for automotive (hereinafter referred to as product), which takes
polypropylene as the matrix, adds continuous glass fiber and other additives, and
adopts extrusion traction process for preparation.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 1040.2-2006 Plastics - Determination of Tensile Properties - Part 2: Test
Conditions for Molding and Extrusion Plastics;
GB/T 1634.2-2019 Plastics - Determination of Temperature of Deflection under Load -
Part 2: Plastics and Ebonite;
GB/T 1843-2008 Plastics - Determination of Izod Impact Strength;
GB/T 1844.1-2008 Plastics - Symbols and Abbreviated Terms - Part 1: Basic Polymers
and Their Special Characteristics;
GB/T 2035-2008 Terms and Definitions for Plastics;
GB/T 2546.1-2006 Plastics - Polypropylene (PP) Molding and Extrusion Materials -
Part 1: Designation System and Basis for Specifications;
GB/T 2547-2008 Plastic Resins - Sampling;
GB/T 2918-2018 Plastics - Standard Atmospheres for Conditioning and Testing;
GB/T 7141-2008 Plastics - Methods of Heat Aging;
GB/T 8170-2008 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values;
GB 8410-2006 Flammability of Automotive Interior Materials;
GB/T 9341-2008 Plastics - Determination of Flexural Properties;
GB/T 9345.1-2008 Plastics - Determination of Ash - Part 1: General Methods;
GB/T 17037.1-2019 Plastics - Injection Molding of Test Specimens of Thermoplastic
Materials - Part 1: General Principles, and Molding of Multipurpose and Bar Test
Specimens;
GB/T 18374-2008 Vocabulary - Terms for Reinforcements;
GB/T 30512-2014 Requirements for Prohibited Substances on Automobiles;
SH/T 1541-2006 Test Method for Appearance of Thermoplastic Granules
3 Terms and Definitions
What is defined in GB/T 2035-2008, GB/T 2546.1-2006 and GB/T 18374-2008, and
the following terms and definitions are applicable to this document.
3.1 Long Glass Fiber Reinforced Polypropylene Compound
Long glass fiber reinforced polypropylene compound refers to glass fiber reinforced
polypropylene granules and mixture with polypropylene resin, which is prepared by
taking polypropylene as the matrix, adding continuous glass fiber and other additives,
and adopting extrusion traction process. In the granules, the average length of glass
fiber shall be not less than 6 mm.
3.2 Tensile Strength Retention
Tensile strength retention refers to the ratio of tensile strength after the aging of sample
to tensile strength before the aging of sample, expressed in “%”.
3.3 Izod Notched Impact Strength Retention
Izod notched impact strength retention refers to the ratio of Izod notched impact
strength after the aging of sample to Izod notched impact strength before the aging of
sample, expressed in “%”.
4 Classification and Designation
4.1 General Rules
Long glass fiber reinforced polypropylene (PP) compound for automotive shall comply
6.1.2 In accordance with different requirements, respectively prepare the following
samples:
a) In accordance with Type-A mold in GB/T 17037.1-2019, prepare samples that
comply with Type-1A in GB/T 1040.2-2006;
b) In accordance with Type-B mold in GB/T 17037.1-2019, prepare 80 mm  10
mm  4 mm samples;
c) In accordance with the requirements in 4.3.1 in GB 8410-2006, prepare 356
mm  100 mm  3 mm samples.
6.2 State Conditioning of Sample and Standard Environment of Test
6.2.1 Unless it is otherwise stipulated, state conditioning of sample shall comply with
the stipulations in GB/T 2918-2018. In state conditioning, the temperature shall be
23 °C ± 2 °C; relative humidity shall be 50% ± 10%; time shall be not less than 40 h
and not more than 96 h.
6.2.2 Tests shall be conducted under the standard environment stipulated in GB/T
2918-2018. Ambient temperature shall be 23 °C ± 2 °C; relative humidity shall be 50%
± 10%.
6.3 Appearance
Appearance test shall be conducted in accordance with the stipulations in SH/T 1541-
2006.
6.4 Ash Content
Ash content test shall be conducted in accordance with the stipulations in GB/T 9345.1-
2008. Adopt direct calcination method (Method-A); burning temperature shall be
750 °C ± 50 °C.
6.5 Tensile Strength
Tensile strength test shall be conducted in accordance with the stipulations in GB/T
1040.2-2006. Adopt Type-1A samples. Test rate shall be 5 mm/min.
6.6 Bending Strength and Bending Modulus
The test of bending strength and bending modulus shall be conducted in accordance
with the stipulations in GB/T 9341-2008. Test rate shall be 2 mm/min.
6.7 Izod Notched Impact Strength
The test of Izod notched impact strength shall comply with the stipulations in GB/T
1843-2008. Specifically speaking:
Exit-factory inspection shall at least include granule appearance, ash content, tensile
strength, bending strength, bending modulus and Izod notched impact strength
retention.
7.3 Group Batch Rules and Sampling Plan
7.3.1 Group batch rules
A group batch shall be constituted of products which have the same designation, and
are produced through the same line of production, the same raw materials and the
same production process. Manufacturers may also build a group batch of products in
accordance with a certain production cycle or storage bin.
7.3.2 Sampling plan
Samples may be taken among products that are already packed. Or, a specific
sampling plan may be determined in accordance with the practical situation, for
example, the production cycle.
The sampling of products that are already packed shall comply with the stipulations in
GB/T 2547-2008.
7.4 Determination Rules and Re-inspection Rules
7.4.1 Determination rules
The test result shall adopt round-off comparison method and comply with the
stipulations in GB/T 8170-2008.
Products shall be inspected by manufacturer’s quality inspection department in
accordance with the test methods stipulated in this Standard. In accordance with the
inspection result and the requirements in this Standard, product quality shall be
determined, and a certificate shall be proposed.
When products exit factory, each batch of products shall be attached with a product
quality inspection certificate, which shall indicate product name, designation, batch No.,
and implemented standard.
7.4.2 Re-inspection rules
In the inspection result, when a certain indicator does not comply with the requirements
in this Standard, re-take samples and conduct a re-inspection of the item in accordance
with GB/T 2547-2008. The re-inspection result shall be a basis for quality determination
of this batch of products.
GB/T 37881-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
G 32
Plastics - Long Glass Fiber Reinforced Polypropylene
(PP) Compound for Automotive
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Classification and Designation ... 5 
5 Requirements ... 7 
6 Test Methods ... 8 
7 Inspection Rules ... 11 
8 Marking, Packaging, Transportation and Storage ... 13 
Plastics - Long Glass Fiber Reinforced Polypropylene
(PP) Compound for Automotive
1 Scope
This Standard stipulates the terms, definitions, classification, designation,
requirements, test methods, inspection rules, marking, packaging, transportation and
storage of long glass fiber reinforced polypropylene (PP) compound for automotive.
This Standard is applicable to long glass fiber reinforced polypropylene (PP)
compound for automotive (hereinafter referred to as product), which takes
polypropylene as the matrix, adds continuous glass fiber and other additives, and
adopts extrusion traction process for preparation.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 1040.2-2006 Plastics - Determination of Tensile Properties - Part 2: Test
Conditions for Molding and Extrusion Plastics;
GB/T 1634.2-2019 Plastics - Determination of Temperature of Deflection under Load -
Part 2: Plastics and Ebonite;
GB/T 1843-2008 Plastics - Determination of Izod Impact Strength;
GB/T 1844.1-2008 Plastics - Symbols and Abbreviated Terms - Part 1: Basic Polymers
and Their Special Characteristics;
GB/T 2035-2008 Terms and Definitions for Plastics;
GB/T 2546.1-2006 Plastics - Polypropylene (PP) Molding and Extrusion Materials -
Part 1: Designation System and Basis for Specifications;
GB/T 2547-2008 Plastic Resins - Sampling;
GB/T 2918-2018 Plastics - Standard Atmospheres for Conditioning and Testing;
GB/T 7141-2008 Plastics - Methods of Heat Aging;
GB/T 8170-2008 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values;
GB 8410-2006 Flammability of Automotive Interior Materials;
GB/T 9341-2008 Plastics - Determination of Flexural Properties;
GB/T 9345.1-2008 Plastics - Determination of Ash - Part 1: General Methods;
GB/T 17037.1-2019 Plastics - Injection Molding of Test Specimens of Thermoplastic
Materials - Part 1: General Principles, and Molding of Multipurpose and Bar Test
Specimens;
GB/T 18374-2008 Vocabulary - Terms for Reinforcements;
GB/T 30512-2014 Requirements for Prohibited Substances on Automobiles;
SH/T 1541-2006 Test Method for Appearance of Thermoplastic Granules
3 Terms and Definitions
What is defined in GB/T 2035-2008, GB/T 2546.1-2006 and GB/T 18374-2008, and
the following terms and definitions are applicable to this document.
3.1 Long Glass Fiber Reinforced Polypropylene Compound
Long glass fiber reinforced polypropylene compound refers to glass fiber reinforced
polypropylene granules and mixture with polypropylene resin, which is prepared by
taking polypropylene as the matrix, adding continuous glass fiber and other additives,
and adopting extrusion traction process. In the granules, the average length of glass
fiber shall be not less than 6 mm.
3.2 Tensile Strength Retention
Tensile strength retention refers to the ratio of tensile strength after the aging of sample
to tensile strength before the aging of sample, expressed in “%”.
3.3 Izod Notched Impact Strength Retention
Izod notched impact strength retention refers to the ratio of Izod notched impact
strength after the aging of sample to Izod notched impact strength before the aging of
sample, expressed in “%”.
4 Classification and Designation
4.1 General Rules
Long glass fiber reinforced polypropylene (PP) compound for automotive shall comply
6.1.2 In accordance with different requirements, respectively prepare the following
samples:
a) In accordance with Type-A mold in GB/T 17037.1-2019, prepare samples that
comply with Type-1A in GB/T 1040.2-2006;
b) In accordance with Type-B mold in GB/T 17037.1-2019, prepare 80 mm  10
mm  4 mm samples;
c) In accordance with the requirements in 4.3.1 in GB 8410-2006, prepare 356
mm  100 mm  3 mm samples.
6.2 State Conditioning of Sample and Standard Environment of Test
6.2.1 Unless it is otherwise stipulated, state conditioning of sample shall comply with
the stipulations in GB/T 2918-2018. In state conditioning, the temperature shall be
23 °C ± 2 °C; relative humidity shall be 50% ± 10%; time shall be not less than 40 h
and not more than 96 h.
6.2.2 Tests shall be conducted under the standard environment stipulated in GB/T
2918-2018. Ambient temperature shall be 23 °C ± 2 °C; relative humidity shall be 50%
± 10%.
6.3 Appearance
Appearance test shall be conducted in accordance with the stipulations in SH/T 1541-
2006.
6.4 Ash Content
Ash content test shall be conducted in accordance with the stipulations in GB/T 9345.1-
2008. Adopt direct calcination method (Method-A); burning temperature shall be
750 °C ± 50 °C.
6.5 Tensile Strength
Tensile strength test shall be conducted in accordance with the stipulations in GB/T
1040.2-2006. Adopt Type-1A samples. Test rate shall be 5 mm/min.
6.6 Bending Strength and Bending Modulus
The test of bending strength and bending modulus shall be conducted in accordance
with the stipulations in GB/T 9341-2008. Test rate shall be 2 mm/min.
6.7 Izod Notched Impact Strength
The test of Izod notched impact strength shall comply with the stipulations i...