1 Scope
This standard specifies the dimensional specification, performance requirements, test methods, inspection rules, packaging, marking, transportation, storage and etc. of polyamide tubing and tube assemblies for air braking systems of vehicles.
This standard is applicable to the tubing system with maximum working pressure of 1.0Mpa or 1.25MPa.
Applicable working temperature range of the tubing system specified in this standard is -40~100℃.
This standard is not applicable to polyamide spiral tube assemblies between motor vehicles and towed vehicles. See QC/T 79 for requirements of spiral tube assemblies.
Note: see Annex D for summary of tests and corresponding specimens.
2 Normative References
The following referenced documents are indispensable for the application 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 1033.1-2008 Plastics - Methods for Determining the Density of Non-cellular Plastics - Part 1: Immersion Method, Liquid Pyknometer Method and Titration Method (ISO 1183-1: 2004, IDT)
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 1043.1-2008 Plastics - Determination of Charpy Impact Properties - Part 1: Non-instrumented Impact Test (ISO 179-1: 2000, IDT)
GB/T 2408-1996 Plastics - Determination of the Burning Behavior of Horizontal and Vertical Specimens in Contact with a Small-flame Ignition Source
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection (ISO 2859-1:1999, IDT)
GB/T 12006.1-2009 Plastics - Polyamides - Part 1: Determination of Viscosity Number
GB/T 16422.2-1999 Plastics - Methods of Exposure to Laboratory Light Sources - Part 2: Xenon-arc Sources (ISO 4892-2:1994, IDT)
GB/T 16422.4-1996 Plastics - Plastics - Methods of the Exposure to Laboratory Light Sources - Part 4: Open-flame Carbon-arc Lamps (ISO 4892-4:1994, EQV)
GB/T 16582-2008 Plastics - Determination of Melting Behavior (Melting Temperature or Melting Range) of Semi-crystalline Polymers by Capillary Tube and Polarizing-microscope Methods (ISO 3146: 2000, IDT)
HG/T 2350-1992 Nomenclature of Polyamide (PA) Homopolymers for Moulding and Extrusion Molding
QC/T 79.1-2008 Road Vehicles - Coiled Pipe Assemblies for Pneumatic Braking Connection between Motor Vehicles and Towed Vehicles - Part 1: Dimensions (ISO 7375-1:1986, MOD)
QC/T 79.2-2008 Road Vehicles - Coiled Pipe Assemblies for Pneumatic Braking Connection between Motor Vehicles and Towed Vehicles - Part 2: Performance Requirements (ISO 7375-2:1998, MOD)
ISO 6427:1992 Plastics; Determination of Matter Extractable by Organic Solvents (Conventional Methods)
3 Definitions
For the purpose of this standard, the following definitions apply.
