This document specifies the technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of the safety belt strap.
This document is applicable to the design, development, production, testing and acceptance of straps used for automobile safety belts.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing change in colour
GB/T 251 Textiles - Tests for colour fastness - Grey scale for assessing staining
GB/T 1220 Stainless steel bars
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3920 Textiles - Tests for colour fastness - Colour fastness to rubbing
GB/T 3922 Textiles - Tests for colour fastness - Colour fastness to perspiration
GB 8410 Flammability of automotive interior materials
GB/T 8427-2019 Textiles - Tests for colour fastness - Colour fastness to artificial light: xenon arc fading lamp test
GB/T 30512 Requirements for prohibited substances on automobiles
GB 38262 Flammability of interior materials for buses
GB/T 39897-2021 Determination of volatile organic compounds and aldehydes and ketones in nonmetallic parts of vehicles
QC/T 236 Test method for automotive interior material properties
FZ/T 60045-2014 Textile trim materials in the interior of automobiles Test method for fogging characteristics
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
strap
flexible component designed to hold the occupant’s body and to transmit stresses to the belt anchorages
3.2
diagonal belt
strap which passes diagonally across the front of the chest from the hip to the opposite shoulder
3.3
lap belt
strap which passes across the front of the wearer’s pelvic region
3.4
continuous belt
strap with the diagonal belt and the lap belt integrated in one piece
4 Technical requirements
4.1 General requirements
4.1.1 The safety belt strap shall meet the requirements of this document, and shall be manufactured according to the product drawings approved through specified procedures.
4.1.2 The specifications of strap thickness shall be agreed upon by the supplier and purchaser.
4.1.3 The strap width shall not be less than 46mm when tested in accordance with 5.2.
4.2 Performance requirements
4.2.1 Tensile load
When the strap is tested in accordance with 5.1.2, the tensile loads of the two specimens shall not be less than those specified in Table 1. The difference between the tensile loads of two specimens shall not exceed 10% of the measured tensile load, whichever is greater.
Contents Foreword III 1 Scope 2 Normative references 3 Terms and definitions 4 Technical requirements 5 Test methods 6 Test rules 7 Marking, packaging, transportation and storage
QC/T 946-2024 Safety belt strap
1 Scope
This document specifies the technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of the safety belt strap.
This document is applicable to the design, development, production, testing and acceptance of straps used for automobile safety belts.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing change in colour
GB/T 251 Textiles - Tests for colour fastness - Grey scale for assessing staining
GB/T 1220 Stainless steel bars
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3920 Textiles - Tests for colour fastness - Colour fastness to rubbing
GB/T 3922 Textiles - Tests for colour fastness - Colour fastness to perspiration
GB 8410 Flammability of automotive interior materials
GB/T 8427-2019 Textiles - Tests for colour fastness - Colour fastness to artificial light: xenon arc fading lamp test
GB/T 30512 Requirements for prohibited substances on automobiles
GB 38262 Flammability of interior materials for buses
GB/T 39897-2021 Determination of volatile organic compounds and aldehydes and ketones in nonmetallic parts of vehicles
QC/T 236 Test method for automotive interior material properties
FZ/T 60045-2014 Textile trim materials in the interior of automobiles Test method for fogging characteristics
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
strap
flexible component designed to hold the occupant’s body and to transmit stresses to the belt anchorages
3.2
diagonal belt
strap which passes diagonally across the front of the chest from the hip to the opposite shoulder
3.3
lap belt
strap which passes across the front of the wearer’s pelvic region
3.4
continuous belt
strap with the diagonal belt and the lap belt integrated in one piece
4 Technical requirements
4.1 General requirements
4.1.1 The safety belt strap shall meet the requirements of this document, and shall be manufactured according to the product drawings approved through specified procedures.
4.1.2 The specifications of strap thickness shall be agreed upon by the supplier and purchaser.
4.1.3 The strap width shall not be less than 46mm when tested in accordance with 5.2.
4.2 Performance requirements
4.2.1 Tensile load
When the strap is tested in accordance with 5.1.2, the tensile loads of the two specimens shall not be less than those specified in Table 1. The difference between the tensile loads of two specimens shall not exceed 10% of the measured tensile load, whichever is greater.
Contents of QC/T 946-2024
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test methods
6 Test rules
7 Marking, packaging, transportation and storage
