GB/T 40068-2021 Electrofusion welding sleeve(tape) for thermal insulation pipeline

ISO 6721-1 ISO 6721-4 EN 489 NACE RP0303 GB/T 1040.1-2006 Plastics—Determination of tensile properties—Part 1:General principles GB/T 1040.1-2018 Plastics—Determination of tensile properties—Part 1:General principles GB/T 1408.1-1999 Methods of test for electric strength of solid insulating materials-Tests at power frequencies GB/T 1408.1-2006 Electrical strength of insulating materials—Test methods—Part 1:Tests at power frequencies GB/T 1408.1-2016 Insulating materials—Test methods for electric strength—Part 1:Test at power frequencies GB/T 1633-2000 Plastics—Thermoplastic materials—Determination of Vicat softening temperature(VST) GB/T 3280-1992 Cold rolled stainless steel sheets and plates GB/T 3280-2007 Cold rolled stainless steel plate, sheet and strip GB/T 3280-2015 Cold rolled stainless steel plate, sheet and strip GB/T 3682.1-2018 Plastics—Determination of the melt mass-flow rate(MFR)and melt volume-flow rate(MVR)of thermoplastics—Part 1:Standard method GB/T 6146-1985 Test method for resistivity of precision resistance alloys GB/T 6146-2010 Test method for resistivity of precision resistance alloys GB/T 7141-1992 Plastics—Methods of exposure to thermal air GB/T 7141-2008 Plastics—Methods of heat aging GB/T 8804.3-2003 Thermoplastic pipes—Determination of tensile properties—Part 3:Polyolefin pipes GB/T 10612-2003 Industrial plate screens—Thickness below 3mm—Round and Square holes GB/T 18475-2001 Thermoplastics materials for pipes and fittings for pressure applications—Classification and designation—Overall Service(design) coefficient GB/T 23257-2009 Polyethylene coating for buried steel pipeline GB/T 23257-2017 Polyethylene coating for buried steel pipeline GB/T 29046-2012 Test methods of technical specification for pre-insulated directly buried district heating pipes GB/T 29046-2023 Detection methods of technical specification for pre-insulated district heating pipes GB/T 29047-2012 Prefabricated directly buried insulating pipes and fittings with polyurethane [PUR]foamed-plastics and high density polyethylene [PE]casing pipes GB/T 29047-2021 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casing pipes GB/T 31838.2-2019 Solid insulating materials—Dielectric and resistive properties—Part 2:Resistive properties(DC methods)—Volume resistance and volume resistivity GB/T 1040.1-2025 Plastics—Determination of tensile properties—Part 1:General principles GB/T 1633-2025 Plastics—Thermoplastic materials—Determination of Vicat softerning temperature(VST)