GB/T 39936-2021Cellular plastics for use in cryogenic thermal insulation (English PDF)

Foreword

This standard was drafted in accordance with the rules of GB/T 1.1-2009.

1 Scope

This standard specifies the classification, classification, requirements, test methods, inspection rules, packaging, marking, and transportation of pre-formed foams for cryogenic insulation. Loss and storage.

This standard is applicable to pre-formed rigid polyisocyanurate foam for cold storage at -196°C~120°C and protection at -110°C~100°C Pre-formed rigid polyurethane foam for cold use.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1036-2008 Determination of the coefficient of linear expansion of plastics at -30°C~30°C Quartz dilatometer method

GB/T 2406.2-2009 Determination of combustion behavior of plastics by oxygen index method Part 2: Room temperature test

GB/T 2918-2018 Standard environment for condition adjustment and testing of plastic specimens

GB/T 6342-1996 Determination of linear dimensions of foam plastics and rubber

GB/T 6343-2009 Determination of Apparent Density of Foam Plastic and Rubber

GB/T 8810-2005 Determination of water absorption rate of rigid foam

GB/T 8811-2008 Rigid foam plastic dimensional stability test method

GB/T 8813-2020 Determination of the compressive properties of rigid foam

GB/T 10294-2008 Determination of steady-state thermal resistance and related characteristics of thermal insulation materials. Protective hot plate method

GB/T 10295-2008 Determination of steady-state thermal resistance and related characteristics of thermal insulation materials by calorimeter method

GB/T 10799-2008 Determination of open and closed cell volume percentage of rigid foam

GB/T 12812-2006 Determination of the fragility of rigid foam

GB/T 20673-2006 Determination of the coefficient of linear expansion of rigid foam below ambient temperature

GB/T 21332-2008 Determination of water vapor transmission performance of rigid foam

JC/T 618-2019 Chemical analysis method of soluble chloride, fluoride, silicate and sodium ions in thermal insulation materials

QB/T 5114-2017 Determination of residual blowing agent in rigid polyurethane foam

HJ1057-2019 Determination of HCFC-22, CFC-11 and HCFC-141b and other ozone-depleting substances in combined polyether headspace/gas Gas chromatography-mass spectrometry

HJ1058-2019 CFC-12, HCFC-22, CFC-11 and HCFC-141b in rigid polyurethane foam and combined polyether Determination of Ozone Depleting Substances Portable Headspace/Gas Chromatography-Mass Spectrometry

3 Categories

Products are divided into two categories according to the type of material. rigid polyisocyanurate foam (PIR) and rigid polyurethane foam (PUR).

4 Classification

The products are divided into seven levels according to different densities. 50kg/m³, 100kg/m³, 160kg/m³, 240kg/m³, 320kg/m³, 450kg/m³, […]