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GB/T 2918-2018   Plastics--Standard atmospheres for conditioning and testing (English Version)
Standard No.: GB/T 2918-2018 Status:valid remind me the status change

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Standard No.: GB/T 2918-2018
English Name: Plastics--Standard atmospheres for conditioning and testing
Chinese Name: 塑料 试样状态调节和试验的标准环境
Chinese Classification: G31    Basic standards and general methods for synthetic resin and plastic
Professional Classification: GB    National Standard
ICS Classification: 83.080.01 83.080.01    Plastics in general 83.080.01
Issued by: SAMR; SAC
Issued on: 2018-12-28
Implemented on: 2019-11-1
Status: valid
Superseding:GB/T 2918-1998 Plastics--Standard atmospheres for conditioning and testing
Language: English
File Format: PDF
Word Count: 5500 words
Price(USD): 164.0
Delivery: via email in 1 business day
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing. In addition to editorial changes, the following technical changes have been made with respect to GB/T 2918-1998: ——“Clause 2 Normative references" is added (see Clause 2); ——the use conditions of standard atmosphere at all levels, "23/50 is applicable to non-tropical countries and 27/65 is applicable to tropical countries” are added, and the content "when obtaining comparative data on polymers, e.g. for databases, standard atmosphere 23/50 shall be used” is specified (see Clause 5); ——the calibration frequency is added (see Clause 6); ——the method for determining the adjustment time of sample state when the equilibrium cannot be reached for a long time is modified (see Annex A). This standard has been redrafted and modified in relation to ISO 291:2008 Plastics - Standard atmospheres for conditioning and testing. The main technical deviations with respect to ISO 291:2008 and their justifications are as follows: ——the adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 "Normative reference", which are shown in the following:  ISO 62 is replaced by GB/T 1034, which is identical to the international standard. ——the content of Note 2 in 8.1 is modified to paragraph; ——the content of Note 3 in 8.1 is modified to paragraph. In addition, the following editorial changes have been made in this standard: ——the informative Annex B "Background information" of ISO 291:2008 is deleted. ——the bibliography is deleted. This standard was proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of SAC/TC 15 National Technical Committee on Plastic of Standardization Administration of China. The previous editions of this standard are as follows: ——GB/T 2918-1982 and GB/T 2918-1998. Plastics - Standard atmospheres for conditioning and testing 1 Scope This standard specifies the specifications relating to the conditioning and testing of all plastics and all types of specimen at constant atmospheric conditions. This standard is applicable to all plastics and all types of specimen. Special atmospheres applicable to a particular test or material or simulating a particular atmosphere are not included in this standard. 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 1034 Plastics - Determination of water absorption (GB/T 1034-2008, ISO 62:2008, IDT) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 standard atmosphere preferred constant atmosphere for which specific air temperature and humidity values, as well as limit ranges for atmospheric pressure and air-circulation velocity, are specified, the air not having any significant additional constituents and the atmosphere not being subject to any significant additional radiation influences Note 1: Standard atmospheres permit a defined state to be attained and maintained for samples or specimens. Note 2: Standard atmospheres correspond to the average atmospheric conditions in laboratories and can be established in conditioning (controlled atmosphere) cabinets, chambers or rooms.   3.2 conditioning atmosphere constant atmosphere in which a sample or specimen is kept before being subjected to a test 3.3 test atmosphere constant atmosphere to which a sample or specimen is exposed throughout a test 3.4 conditioning one or more operations intended to bring a sample or specimen into a state of equilibrium with regard to temperature and humidity 3.5 conditioning procedure combination of the conditioning atmosphere and the period of conditioning 3.6 ambient temperature atmosphere conditions corresponding to the usual atmospheric conditions in laboratories with uncontrolled temperature and humidity Note: The phrase “at ambient temperature” refers to an atmosphere the air temperature of which lies within a specified range, no consideration being given to relative humidity, atmospheric pressure or air-circulation velocity. In general, the air-temperature range extends from 18℃ to 28℃ and is stated as “at an ambient temperature of 18℃ to 28℃”. 4 Principle If a specimen is exposed to a specific conditioning atmosphere or temperature, then a reproducible state of temperature and/or of moisture equilibrium is reached between the specimen and the conditioning atmosphere or temperature. It is not the intent of this standard to define procedures specifying how to determine sensitivity to moisture. Some materials may have special conditioning requirements. Follow the relevant material standards.   5 Standard atmosphere Unless otherwise specified, use one of the sets of conditions given in Table 1 as the standard atmosphere. Table 1 Standard atmospheres Symbol for standard atmosphere Air temperature/℃ Relative humidity (RH)/% Remarks a 23/50 23 50 For non-tropical countries 27/65 27 65 For tropical countries a When obtaining comparative data on polymers, e.g. for databases, standard atmosphere 23/50 shall be used. Note: The values in Table 1 apply to normal altitudes with an atmospheric pressure between 86kPa and 106kPa and an air-circulation velocity ≤1m/s.
Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Standard atmosphere 6 Classes of standard atmosphere 7 Standard temperature and ambient temperature 8 Procedures
Referred in GB/T 2918-2018:
*GB/T 1034-2008 Plastics - Determination of water absorption
*GB/T 95-2002 Plain washers - Product grade C
*GB/T 35590-2017 Information technology―General specification for portable digital equipments used power bank
*GB/T 2662-2008 Cotton wadded clothes
*GB/T 2662-2017 Clothes with fillings
*GB/T 14048.5-2017 Low-voltage switchgear and controlgear-Part 5-1:Control circuit devices and switching element-Electromechanical control circuit devices
*GB/T 18455-2022 Packaging recycling marking
*GB/T 2664-2009 Mens suits and coats
*QB/T 1858-2004 Perfume and cologne
*GB/T 14272-2011 Down Garments
GB/T 2918-2018 is referred in:
*QC/T 704-2004 Test method of PU foam wrap layer integer hardness for auto steering-wheel
*GB/T 28535-2018 Separators for lead-acid batteries
*GB 38995-2020 Infant feeding bottles and teats
*GB/T 7124-2008 Adhesives - Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
*YY/T 0681.7-2011 Test methods for sterile medical device package—Part 7:Evaluating inks or coating adhesion to flexible packaging materials using tape
*GB/T 38288-2019 Plastics—Recycled polypropylene compound
*GB/T 29645-2013 Plastics—Recycled polystyrene compound
*YY/T 0681.6-2011 Test methods for sterile medical device package—Part 6:Evaluation of chemical resistance of printed inks and coatings on flexible packaging materials
*YY/T 0681.5-2010 Test methods for sterile medical device package—Part 5:Detecting gross leaks in medical packaging by internal pressurization(bubble test)
*GB/T 18833-2012 Retroreflective sheeting for traffic control
*GB/T 30019-2013 Carbon fiber—Determination of density
*GB/T 29848-2018 Ethylene--vinyl acetate copolymer (EVA) film for PV module
*YY/T 0681.12-2022 Test methods for sterile medical device package―Part 12:Flex durability of flexible barrier materials
*GB/T 40006.7-2021 Plastics—Recycled plastics—Part 7: Polycarbonate(PC) materials
*GB/T 41004.2-2021 Intelligent pipe network system-Part 2 :Intelligent plastic pipes , fittings and valves
*GB/T 41003.2-2021 General technical specification for plastic foam mats—Part 2: Indoor polyvinyl chloride foam mats
*GB/T 41003.1-2021 General technical specification for plastic foam mats—Part 1:Polyethylene/ethylene vinylacetate copolymer foam mats for children
*GB/T 41167-2021 General requirements for polyethylene terephthalate(PET) bottle for drinks
*GB/T 41762.2-2022 Fibre-reinforced plastic composites—Determination of laminate through-thickness properties—Part 2:Determination of the elastic modulus,the strength and the Weibull size effects by flexural test of unidirectional laminate,for carbon-fibre based systems
*GB/T 41878-2022 Plastics—Determination of scratch properties
*CJ/T 234-2006 High density polyethylene geomembrane for landfills
*GB/T 41682-2022 Determination of headspace gas content in plastic packaging container for food—Sensor method
*GB/T 19473.3-2020 Polybutene (PB) piping systems for hot and cold water installations—Part 3:Fittings
*Q/BQB 518-2018 Wire rod used for steel fibre
*GB/T 1634.1-2019 Plastics—Determination of temperature of deflection under load—Part 1:General test method
*GB/T 41532-2022 Poly(vinyl chloride)structural foam panel
*CJ/T 258-2014 Fiber reinforced polypropylene random copolymer composite pipe
*GB/T 37263-2018 Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane(PUR) foamed-plastics and high density polyethylene(PE) casing pipes
*GB 13392-2023 Vehicle marking of dangerous goods for road transportation
*GB/T 2794-2022 Determination for viscosity of adhesives
*GB/T 42948-2023 Protective polyethylene gloves for daily use
*GB/T 10802-2023 General flexible polyurethane cellular plastics
*HG/T 20696-2018 Technical code of reinforced plastics equipment for chemical industry
*GB/T 3960-2016 Plastics―Test method for friction and wear by sliding
*GB/T 28799.4-2024 Polyethylene of raised temperature resistance(PE-RT) piping systems for hot and cold water installations—Part 4:Valves
*GB/T 43005-2023 Composite pipes of polyethylene reinforced with continuous wound glass-fiber-tape for water supply
*TB/T 3104.1-2020/XG1-2024 Brake shoes for rolling stock. Part 1:Composite brake shoes,includes Amendment 1
*GB/T 17748-2008 Aluminium-plastic Composite Panel for Curtain Wall
*GB/T 17643-2025 Geosynthetics—Polyethylene geomembrane
*GB/T 13663.2-2018 Polyethylene(PE) piping systems for water supply—Part2: Pipes
Code of China
Standard
GB/T 2918-2018  Plastics--Standard atmospheres for conditioning and testing (English Version)
Standard No.GB/T 2918-2018
Statusvalid
LanguageEnglish
File FormatPDF
Word Count5500 words
Price(USD)164.0
Implemented on2019-11-1
Deliveryvia email in 1 business day
Detail of GB/T 2918-2018
Standard No.
GB/T 2918-2018
English Name
Plastics--Standard atmospheres for conditioning and testing
Chinese Name
塑料 试样状态调节和试验的标准环境
Chinese Classification
G31
Professional Classification
GB
ICS Classification
Issued by
SAMR; SAC
Issued on
2018-12-28
Implemented on
2019-11-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB/T 2918-1998 Plastics--Standard atmospheres for conditioning and testing
Language
English
File Format
PDF
Word Count
5500 words
Price(USD)
164.0
Keywords
GB/T 2918-2018, GB 2918-2018, GBT 2918-2018, GB/T2918-2018, GB/T 2918, GB/T2918, GB2918-2018, GB 2918, GB2918, GBT2918-2018, GBT 2918, GBT2918
Introduction of GB/T 2918-2018
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing. In addition to editorial changes, the following technical changes have been made with respect to GB/T 2918-1998: ——“Clause 2 Normative references" is added (see Clause 2); ——the use conditions of standard atmosphere at all levels, "23/50 is applicable to non-tropical countries and 27/65 is applicable to tropical countries” are added, and the content "when obtaining comparative data on polymers, e.g. for databases, standard atmosphere 23/50 shall be used” is specified (see Clause 5); ——the calibration frequency is added (see Clause 6); ——the method for determining the adjustment time of sample state when the equilibrium cannot be reached for a long time is modified (see Annex A). This standard has been redrafted and modified in relation to ISO 291:2008 Plastics - Standard atmospheres for conditioning and testing. The main technical deviations with respect to ISO 291:2008 and their justifications are as follows: ——the adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 "Normative reference", which are shown in the following:  ISO 62 is replaced by GB/T 1034, which is identical to the international standard. ——the content of Note 2 in 8.1 is modified to paragraph; ——the content of Note 3 in 8.1 is modified to paragraph. In addition, the following editorial changes have been made in this standard: ——the informative Annex B "Background information" of ISO 291:2008 is deleted. ——the bibliography is deleted. This standard was proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of SAC/TC 15 National Technical Committee on Plastic of Standardization Administration of China. The previous editions of this standard are as follows: ——GB/T 2918-1982 and GB/T 2918-1998. Plastics - Standard atmospheres for conditioning and testing 1 Scope This standard specifies the specifications relating to the conditioning and testing of all plastics and all types of specimen at constant atmospheric conditions. This standard is applicable to all plastics and all types of specimen. Special atmospheres applicable to a particular test or material or simulating a particular atmosphere are not included in this standard. 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 1034 Plastics - Determination of water absorption (GB/T 1034-2008, ISO 62:2008, IDT) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 standard atmosphere preferred constant atmosphere for which specific air temperature and humidity values, as well as limit ranges for atmospheric pressure and air-circulation velocity, are specified, the air not having any significant additional constituents and the atmosphere not being subject to any significant additional radiation influences Note 1: Standard atmospheres permit a defined state to be attained and maintained for samples or specimens. Note 2: Standard atmospheres correspond to the average atmospheric conditions in laboratories and can be established in conditioning (controlled atmosphere) cabinets, chambers or rooms.   3.2 conditioning atmosphere constant atmosphere in which a sample or specimen is kept before being subjected to a test 3.3 test atmosphere constant atmosphere to which a sample or specimen is exposed throughout a test 3.4 conditioning one or more operations intended to bring a sample or specimen into a state of equilibrium with regard to temperature and humidity 3.5 conditioning procedure combination of the conditioning atmosphere and the period of conditioning 3.6 ambient temperature atmosphere conditions corresponding to the usual atmospheric conditions in laboratories with uncontrolled temperature and humidity Note: The phrase “at ambient temperature” refers to an atmosphere the air temperature of which lies within a specified range, no consideration being given to relative humidity, atmospheric pressure or air-circulation velocity. In general, the air-temperature range extends from 18℃ to 28℃ and is stated as “at an ambient temperature of 18℃ to 28℃”. 4 Principle If a specimen is exposed to a specific conditioning atmosphere or temperature, then a reproducible state of temperature and/or of moisture equilibrium is reached between the specimen and the conditioning atmosphere or temperature. It is not the intent of this standard to define procedures specifying how to determine sensitivity to moisture. Some materials may have special conditioning requirements. Follow the relevant material standards.   5 Standard atmosphere Unless otherwise specified, use one of the sets of conditions given in Table 1 as the standard atmosphere. Table 1 Standard atmospheres Symbol for standard atmosphere Air temperature/℃ Relative humidity (RH)/% Remarks a 23/50 23 50 For non-tropical countries 27/65 27 65 For tropical countries a When obtaining comparative data on polymers, e.g. for databases, standard atmosphere 23/50 shall be used. Note: The values in Table 1 apply to normal altitudes with an atmospheric pressure between 86kPa and 106kPa and an air-circulation velocity ≤1m/s.
Contents of GB/T 2918-2018
Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Standard atmosphere 6 Classes of standard atmosphere 7 Standard temperature and ambient temperature 8 Procedures
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Keywords:
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