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GB/T 2918-1998   Plastics--Standard atmospheres for conditioning and testing (English Version)
Standard No.: GB/T 2918-1998 Status:superseded remind me the status change

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Standard No.: GB/T 2918-1998
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: 83.040.01 83.040.01    Raw materials for rubber and plastics in general 83.040.01
Issued by: State Quality and Technology Supervision Bureau
Issued on: 1998-10-19
Implemented on: 1999-4-1
Status: superseded
Superseded by:GB/T 2918-2018 Plastics--Standard atmospheres for conditioning and testing
Superseded on:2019-11-1
Superseding:GB 2918-1982 Standard atmospheres for conditioning and testing of plastic specimens
Language: English
File Format: PDF
Word Count: 3000 words
Price(USD): 304.0
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 identical to international standard ISO 291:1997 "Plastics — Standard Atmospheres for Conditioning and Testing". Technical contents and redaction method of this Standard are equivalent to ISO 291:1997, except some editorial changes base on China's national conditions. Previous edition of this Standard is GB/T 2918-1982 "Plastics-Standard Atmospheres for Conditioning and Testing" Compared with the preceding edition, main technical content changes are as follows: 1. Standard atmosphere was changed from (23/50) into (23/50 and 27/65). 2. Tolerance of temperature and relative humidity was changed form "only consider about time deviation" into "consider about either time deviation or deviation of sample position in the test atmosphere". 3. Grade 1 tolerance of relative humidity was changed form "± 2 %" into "± 5 %", and Grade 2 tolerance of relative humidity was changed form "± 5 %" into "± 10 %". 4. Humidity requirements in relation to two types of atmosphere "standard temperature" and "room temperature", which was changed form "normal humidity (i.e. 45 % ~ 75 %)" into "do not have to control relative humidity". 5. "Normal temperature" was changed into "room temperature", and the temperature range was changed from "10 ℃ ~ 35 ℃" into "18 ℃ ~ 28 ℃". 6. For the period of conditioning, supplement the requirements of "a minimum of 4 h for ambient temperatures of 18 ℃ to 28 ℃" in this Standard. 7. Supplement the three terms and definitions of "standard atmosphere", Chapter 3 "Principle", Appendix A and Appendix B in this Standard. This Standard replaces GB/T 2918-1982 from the implementation date hereof. Appendix A of this Standard is normative, and Appendix B is informative. This Standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This Standard is under the jurisdiction of National Technical Committee on Plastic of Standardization Administration of China - Subcommittee on product (SC 4). Drafting organizations of this Standard: Chenguang Chemical Research Institute of the Ministry of Chemical Industry. Participating drafting organizations of this Standard: Sichuan University, Beijing Institute of Aeronautical Materials, Beijing Plastics Research Institute and Shanghai Plastics Research Institute. Chief drafting staff of this Standard: Wang Yongming. First issue time of this Standard: March 2, 1982. ISO Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 291 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, Chemical and Environmental Resistance. This second edition of ISO 291 cancels and replaces the first edition (ISO 291:1977), which has been technically revised. Annex A of this International Standard is an indispensable part of this document, and Annex B is for information only. NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA 中华人民共和国国家标准 Plastics — Standard Atmospheres for Conditioning and Testing 塑料试样状态调节和试验的标准环境 GB/T 2918-1998 idt ISO 291:1997 Replace GB/T 2918-1982 1 Scope This Standard sets out specifications relating to the conditioning and testing of all plastics and all types of test specimens at constant atmospheric conditions which correspond to the average atmospheric conditions in laboratories. Special atmospheres applicable to a particular test or material or simulating a particular climatic environment are not included in this Standard. 2 Definitions For the purposes of this International Standard, the following definitions apply: 2.1 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. 2 Standard atmospheres correspond to the average atmospheric conditions in laboratories and can be established in conditioning (controlled atmosphere) cabinets, chambers or rooms. 2.2 Conditioning atmosphere Constant atmosphere in which a sample or test specimen is kept before being subjected to test. 2.3 Test atmosphere Constant atmosphere to which a sample or test specimen is exposed throughout the test. 2.4 Conditioning One or more operations intended to bring a sample or test specimen into a state of equilibrium with regard to temperature and humidity. 2.5 Conditioning procedure Combination of the conditioning atmosphere and the period of conditioning. Note 3: In this Standard the conditioning atmosphere and the test atmosphere are usually selected as the standard atmosphere. 2.6 Ambient temperature Environmental conditions corresponding to the usual atmospheric conditions in laboratories with uncontrolled temperature and humidity. 3 Principle If a test specimen is exposed to a specific conditioning atmosphere or temperature, then a reproducible state of temperature and/or moisture equilibrium is reached between the test specimen and the conditioning atmosphere or temperature. 4 Standard Atmospheres Unless otherwise specified, use the conditions given in Table 1 as the standard atmosphere. Table 1 Standard Atmospheres Symbol for standard atmosphere Air temperature t ℃ Relative humidity U % Remarks 23/50 23 50 Shall be used unless otherwise specified 27/65 27 65 May be used for tropical countries if agreed on by all parties Note 4: The values in Table 1 apply to normal altitudes with an atmospheric pressure between 86 kPa and 106 kPa and an air-circulation velocity ≤ 1 m/s. 5 Classes of Standard Atmosphere Table 2 gives two different classes of standard atmosphere corresponding to different tolerance levels for the temperature and relative humidity. The tolerances given in Table 2 apply to the specimen-stowage space in a test enclosure or conditioning enclosure and include deviations both with respect to time and with respect to the position of the test specimen in the enclosure.
Referred in GB/T 2918-1998:
*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 2918-1998 is referred in:
* 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
* GB/T 1040.1-2006 Plastics - Determination of tensile properties - Part 1: General principles
* GB 18586-2001 Indoor decorating and refurbishing materials-Limit of harmful substances of polyvinyl chloride floor coverings
* GB 21550-2008 The restriction of hazardous materials in polyvinyl chloride artificial leather
* GB/T 2408-2008 Plastics - Determination of burning characteristics - Horizontal and vertical test
* GB/T 2408-2008 Plastics - Determination of burning characteristics - Horizontal and vertical test
* 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
* GB 21550-2008 The restriction of hazardous materials in polyvinyl chloride artificial leather
* GB/T 6343-2009 Cellular plastics and rubbers - Determination of apparent density
* GB/T 28117-2011 Multi-layer co-extrusion films and pouches for food packaging
* GB/T 19472.1-2004 Polyethylene structure wall pipeline system for underground usage Part 1:Polyethylene double wall corrugated pipes
* GB/T 2408-2008 Plastics - Determination of burning characteristics - Horizontal and vertical test
* GB/T 2408-2008 Plastics - Determination of burning characteristics - Horizontal and vertical test
* GB/T 17748-2008 Aluminium-plastic Composite Panel for Curtain Wall
* GB/T 17748-2008 Aluminium-plastic Composite Panel for Curtain Wall
* GB/T 20394-2006 Gymnastic Artificial Turf
* GB/T 1038-2000 Plastics - Film and Sheeting - Determination of Gas Transmission - Differential-pressure Method
* GB/T 10004-2008 Plastic Laminated Films and Pouches for Packaging - Dry Lamination and Extrusion Lamination
* CJ/T 123-2004 Steel reinforced polyethylene plastic pipes for water supply
* CJ/T 124-2004 Fittings of steel reinforced polyethylene plastic pipes for water supply
* CJ/T 125-2000 Steel framed polyethylene plastic pipes for the supply of gaseous fuels
* GB/T 28799.2-2012 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 2: Pipes
* GB/T 1633-2000 Plastics--Thermoplastic materials--Determination of Vicat sofening temperature (VST)
*GB/T 17794-2008 Preformed flexible elastomeric cellular thermal insulation
*GB/T 3398.2-2008 Plastics - Determination of hardness - Part 2: Rockwell hardness
*GB/T 9341-2008 Plastics - Determination of flexural properties
*GB/T 1041-2008 Plastics - Detemination of compressive properties
*GB/T 2411-2008 Plastics and ebonite - Determination of indentation hardness by means of a duronmeter(shore hardness)
*TB/T 2813-2015 Friction Damper Wedge for Freight Car
*TB/T 2403-2010 Brake shoes for fright rolling stock of railways
*GB/T 18477.1-2007 Unplasticized polyvinyl chloride (PVC-U) structure wall pipline system for underground soil waste and drainage - Part 1: double wall corrugated pipes
*GB/T 10802-2006 General flexible polyether polyurethane cellular plastics
*GB 15558.1-2015 Buried polyethylene(PE)piping systems for the supply of gaseous fuels―Part 1:Pipes
*GB/T 1634.1-2004 Plastics - Determination of temperature of deflection under load - Part 3: High-strength thermosetting laminates
*GB/T 8333-2008 Test method for flammability of rigid cellular plastic - Virtical burning method
*GB/T 36363-2018 Polyolefin separator for lithium-ion battery
*GB/T 3960-2016 Plastics―Test method for friction and wear by sliding
*GB/T 16422.1-2006 Plastics - Methods of the exposure to laboratory light sources - Part 1: General guidance
*GB/T 14486-2008 Dimensional tolerances for moulded plastic parts
*GB/T 3398.1-2008 Plastics - Determination of hardness - Part 1: Ball indentation method
*GB/T 5836.2-2018 Unplasticized poly(vinyl chloride)(PVC-U) fittings for soil and waste discharge inside buildings
*QB/T 1646-2007 Polyurethane synthetic leather
*GB/T 20394-2019 Gymnastic artificial turf
*QB/T 2463.2-2018 Unplasticized polyvinyl chloride foam boards. Part 2: celuka extrusion process
*GB/T 1981.2-2009 Varnishes used for electrical insulation—Part 2:Methods of test
*QB/T 4041-2010 Polytetrafluoroethylene Rod
*GB/T 5478-2008 Plastics - Test method for wear by rolling
*YD/T 3353.1-2018 Color masterbatch for telecommunication cable and optical fiber cable Part 1:Color masterbatch used for optical fiber loose tube
*GJB 1251A-2008 Specification for cast acrylic plastic sheet of aircraft
*HG/T 4282-2011 Test method of tensile for plastics welded test specimen
*HG/T 4283-2011 Test method of bending for plastics welded test specimen
*GB/T 12027-2004 Plastics— film and sheeting—Determination of dimensional change on heating
*GB/T 18742.2-2017 Polypropylene(PP) piping systems for hot and cold water installations―Part 2:Pipes
*GB/T 35453-2017 Rigid polyurethane foam board for frozen soil subgrade(DLPU)
*QB/T 4671-2014 Test Method for Synthetic Leather/Artificial Leather – Resistance to Hydrolysis
*GB/T 12670-2008 Polypropylene (PP) resin
*GB/T 12672-2009 Acrylonitrile-butadiene-styrene(ABS)resin
*QB/T 5141-2017 Polyurethane synthetic leather for casual shoes
Code of China
Standard
GB/T 2918-1998  Plastics--Standard atmospheres for conditioning and testing (English Version)
Standard No.GB/T 2918-1998
Statussuperseded
LanguageEnglish
File FormatPDF
Word Count3000 words
Price(USD)304.0
Implemented on1999-4-1
Deliveryvia email in 1 business day
Detail of GB/T 2918-1998
Standard No.
GB/T 2918-1998
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
State Quality and Technology Supervision Bureau
Issued on
1998-10-19
Implemented on
1999-4-1
Status
superseded
Superseded by
GB/T 2918-2018 Plastics--Standard atmospheres for conditioning and testing
Superseded on
2019-11-1
Abolished on
Superseding
GB 2918-1982 Standard atmospheres for conditioning and testing of plastic specimens
Language
English
File Format
PDF
Word Count
3000 words
Price(USD)
304.0
Keywords
GB/T 2918-1998, GB 2918-1998, GBT 2918-1998, GB/T2918-1998, GB/T 2918, GB/T2918, GB2918-1998, GB 2918, GB2918, GBT2918-1998, GBT 2918, GBT2918
Introduction of GB/T 2918-1998
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 identical to international standard ISO 291:1997 "Plastics — Standard Atmospheres for Conditioning and Testing". Technical contents and redaction method of this Standard are equivalent to ISO 291:1997, except some editorial changes base on China's national conditions. Previous edition of this Standard is GB/T 2918-1982 "Plastics-Standard Atmospheres for Conditioning and Testing" Compared with the preceding edition, main technical content changes are as follows: 1. Standard atmosphere was changed from (23/50) into (23/50 and 27/65). 2. Tolerance of temperature and relative humidity was changed form "only consider about time deviation" into "consider about either time deviation or deviation of sample position in the test atmosphere". 3. Grade 1 tolerance of relative humidity was changed form "± 2 %" into "± 5 %", and Grade 2 tolerance of relative humidity was changed form "± 5 %" into "± 10 %". 4. Humidity requirements in relation to two types of atmosphere "standard temperature" and "room temperature", which was changed form "normal humidity (i.e. 45 % ~ 75 %)" into "do not have to control relative humidity". 5. "Normal temperature" was changed into "room temperature", and the temperature range was changed from "10 ℃ ~ 35 ℃" into "18 ℃ ~ 28 ℃". 6. For the period of conditioning, supplement the requirements of "a minimum of 4 h for ambient temperatures of 18 ℃ to 28 ℃" in this Standard. 7. Supplement the three terms and definitions of "standard atmosphere", Chapter 3 "Principle", Appendix A and Appendix B in this Standard. This Standard replaces GB/T 2918-1982 from the implementation date hereof. Appendix A of this Standard is normative, and Appendix B is informative. This Standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This Standard is under the jurisdiction of National Technical Committee on Plastic of Standardization Administration of China - Subcommittee on product (SC 4). Drafting organizations of this Standard: Chenguang Chemical Research Institute of the Ministry of Chemical Industry. Participating drafting organizations of this Standard: Sichuan University, Beijing Institute of Aeronautical Materials, Beijing Plastics Research Institute and Shanghai Plastics Research Institute. Chief drafting staff of this Standard: Wang Yongming. First issue time of this Standard: March 2, 1982. ISO Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 291 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, Chemical and Environmental Resistance. This second edition of ISO 291 cancels and replaces the first edition (ISO 291:1977), which has been technically revised. Annex A of this International Standard is an indispensable part of this document, and Annex B is for information only. NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA 中华人民共和国国家标准 Plastics — Standard Atmospheres for Conditioning and Testing 塑料试样状态调节和试验的标准环境 GB/T 2918-1998 idt ISO 291:1997 Replace GB/T 2918-1982 1 Scope This Standard sets out specifications relating to the conditioning and testing of all plastics and all types of test specimens at constant atmospheric conditions which correspond to the average atmospheric conditions in laboratories. Special atmospheres applicable to a particular test or material or simulating a particular climatic environment are not included in this Standard. 2 Definitions For the purposes of this International Standard, the following definitions apply: 2.1 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. 2 Standard atmospheres correspond to the average atmospheric conditions in laboratories and can be established in conditioning (controlled atmosphere) cabinets, chambers or rooms. 2.2 Conditioning atmosphere Constant atmosphere in which a sample or test specimen is kept before being subjected to test. 2.3 Test atmosphere Constant atmosphere to which a sample or test specimen is exposed throughout the test. 2.4 Conditioning One or more operations intended to bring a sample or test specimen into a state of equilibrium with regard to temperature and humidity. 2.5 Conditioning procedure Combination of the conditioning atmosphere and the period of conditioning. Note 3: In this Standard the conditioning atmosphere and the test atmosphere are usually selected as the standard atmosphere. 2.6 Ambient temperature Environmental conditions corresponding to the usual atmospheric conditions in laboratories with uncontrolled temperature and humidity. 3 Principle If a test specimen is exposed to a specific conditioning atmosphere or temperature, then a reproducible state of temperature and/or moisture equilibrium is reached between the test specimen and the conditioning atmosphere or temperature. 4 Standard Atmospheres Unless otherwise specified, use the conditions given in Table 1 as the standard atmosphere. Table 1 Standard Atmospheres Symbol for standard atmosphere Air temperature t ℃ Relative humidity U % Remarks 23/50 23 50 Shall be used unless otherwise specified 27/65 27 65 May be used for tropical countries if agreed on by all parties Note 4: The values in Table 1 apply to normal altitudes with an atmospheric pressure between 86 kPa and 106 kPa and an air-circulation velocity ≤ 1 m/s. 5 Classes of Standard Atmosphere Table 2 gives two different classes of standard atmosphere corresponding to different tolerance levels for the temperature and relative humidity. The tolerances given in Table 2 apply to the specimen-stowage space in a test enclosure or conditioning enclosure and include deviations both with respect to time and with respect to the position of the test specimen in the enclosure.
Contents of GB/T 2918-1998
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Keywords:
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