Specific environmental condition - Guidance for choosing - Part 2: Polymer materials
Some standard content:
ICS19.040
National Standard of the People's Republic of China
GB/T20644.2—2006
Special environmental condition
Guidance for choosing
Part 2:Polymer materials
Published on 2006-11-08
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implemented on 2007-04-01
GB/T 20644.2—2006
Normative referenced documents
Classification of polymer materials
Classification of use environment
Requirements of use environment for polymer materials
6 Selection of polymer material types
Selection of test evaluation items
Selection of test methods
Appendix A (informative appendix) Plastic materials commonly used under dry heat, dry hot desert and plateau environmental conditions Appendix (informative appendix) Rubber materials commonly used under dry heat, dry hot desert and plateau environmental conditions 2
GB/T 20644 Selection guidelines for special environmental conditions consists of the following parts: Selection guidelines for special environmental conditions Part 1: Metal surface protection - Special environmental conditions: Selection guidelines Part 2: Polymer materials This part is Part 2 of GB/T 20644. GE/T 20644.2-—2006
This part focuses on the environmental conditions of the special environment in western my country, such as the influence of environmental factors such as temperature, dust, solar radiation, and the selection guidelines.
Appendix A and Appendix B of this part are informative appendices. This part was proposed by the China Electrical Equipment Industry Association. This part is under the jurisdiction of the China Electrical Equipment Industry Association. This part was drafted by the Guangzhou Electric Science Research Institute, and the Beijing Electrical Technology and Economic Research Institute of the Machinery Industry participated in the drafting. The main drafters of this part are Qi Li, Peng Jian, and Li Feng. This part is entrusted to the Guangzhou Electric Science Research Institute for interpretation. GB/T 20644.2—2006
Guidelines for the Selection of Special Environmental Conditions Part 2: Polymer Materials" is a national science and technology basic work project "Material Standards for Extreme (Special) Environmental Conditions" and is one of a series of national standards urgently needed for the development and construction of western my country. The western region of my country is located in the harsh environment of plateau, dry heat and dry heat desert, which has a serious impact on the durable and reliable use of various basic equipment, including various mechanical electronics, electrical, communication, instrumentation and transportation equipment. In the past, my country has not conducted much research on the performance of some materials and basic equipment in the above-mentioned special natural environment. The basic research on special conditions, the research on the adaptability of materials and equipment to special conditions, and the formulation of these basic standards, including the determination and classification of conditional limits, simulation test methods, and technical measures to ensure the normal use of materials under extreme conditions, are still blank. There is a lack of systematic collection and research on the data of special materials such as plateau, heat and desert, as well as the impact of special conditions on heavy fire engineering projects. There is a lack of systematic research on the serious hazards caused by supporting infrastructure. If these problems are not solved, it will directly affect the implementation of large engineering projects in my country under special conditions. With the rapid development of the western region, more engineering projects will be built in the western region in the future. In order to improve the environmental adaptability and reliability and durability of basic equipment, materials, components and equipment should be evaluated and assessed through corresponding environmental tests.
The "Material Standards for Extreme (Special) Environmental Conditions" project mainly formulates basic national standards through research on special environmental conditions in the plateau, major engineering basic materials, and electromechanical products. The content involves the standard system of plateau electromechanical equipment, special environmental terms, classification of special environmental conditions, general rules for protection types, guidelines for artificial simulation tests at commercial altitudes, gold-bottom materials, commercial grade materials, major electromechanical equipment, and plateau adaptability requirements for engineering machinery and equipment. A total of 25 national standards have been completed or are being formulated: (1) GB/T20625-2006 Special Environmental Conditions: Terminology (2) GB/T 196072004 Special environmental conditions protection type and code (3) GB/T19608.1-2004 Special environmental conditions classification Part 1: Dry heat (4) GB/T19608.2-2004 Special environmental conditions classification Part 2: Hot desert () GB/T19608.3-2004 Special environmental conditions classification Part 3: Plateau (6) GB/T20626.1-2006 Special environmental components Part 1: General technical conditions for electrical and electronic products in plateaus [7) GB/T20626.2-2006 Special environmental conditions Part 2: Commercial electrician Electronic product selection and inspection specifications (8 GB/T20626.3-2006 Special environmental conditions Part 3: Protection requirements for plateau electrical and electronic products against lightning, condensation and temperature
(9) GB/T20643.1-2006 Environmental test methods for special environmental conditions Part 1: General (10) GB/T20643.2 Environmental test methods for special environmental conditions Part 2: Artificial simulation test methods and guidelines Electrical and electronic products including communication products (including approval) (11) GB/T20643.3-2006 Environmental test methods for special environmental conditions Part 3: Artificial simulation test Methods and guidelines Polymer materials
(12) GB/T20644.1-2006 Guidelines for selection of special environmental conditions Part 1: Metal surface protection (13) GB/T20644.2-2006 Guidelines for selection of special environmental conditions: Part 2: Commercial polymer materials (14) GB/T20645-2006 Technical requirements for low-voltage electrical appliances for plateaus under special environmental conditions (15) Plateau machinery under special environmental conditions Part 1: Commercial requirements for internal combustion power machinery (already submitted for approval) (16) Commercial machinery under special environmental conditions Part 2: Requirements for construction machinery under plateaus (already submitted for approval) (17) Plateau machinery for special environmental conditions Part 3: Selection and acceptance specifications for plateau-type construction machinery (already submitted for approval) (18) Aluminum alloy profiles for rail vehicle structures under special environmental conditions (already submitted for approval) (19) Technical requirements for low-voltage complete switchgear and control equipment for plateaus under special environmental conditions (already submitted for approval) (20) Technical requirements for electrical equipment in plateaus under special environmental conditions Commercial voltage electrical appliances and switchgear (under preparation) (21) Requirements for internal combustion power stations in plateaus under special environmental conditions (under preparation) (22) Copper alloy contact wires for electric trains under special environmental conditions (under preparation) GB/T 20644.2--2006
(23) Special environmental conditions Guidelines for testing in natural environments of plateaus Internal combustion power machinery (under preparation) (24) Special environmental conditions
Guidelines for testing in natural environments of plateaus Construction machinery (under preparation) (25) Special environmental conditions
Standard system for plateaus for electromechanical equipment
Special environmental conditions, selection guidelines
Part 2: Polymer materials
GB/T 20644.2—2006
This part of GB/T 20644 provides selection guidelines for polymer materials under three special environmental conditions: dry-hot desert and plateaus.
This part is applicable to plastics, rubber and coatings. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of GB/T 20644. For dated references, all subsequent amendments (excluding errata) or revised editions are not applicable to this section. However, parties to an agreement based on this part are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part.
GB/T1844.1—1995 Plastics and resin abbreviations Part 1: Basic compounds and their characteristic properties (neq1ISO10131:1987
GB/T1844.2—1995 Plastics and resin abbreviations Part 2: Filling and reinforcing materialsnegISO1043-2:1987) GB/T3512—2001 Rubber or thermoplastic rubber Hot air accelerated aging and heat resistance test (eqvIS0188: 1998）GB/T3681-2000 Test method for atmospheric exposure of plastics (negISO8771994)GB/T9278—1996 Test method for natural climate exposure of coatings (egvISO2810)G/T20625—2006 Terminology of special environmental conditionsGB/T20643.3--2006 Special environmental conditions, environmental test methods Part 3: Artificial simulation test methods and guidelines Commercial molecular forest materials
GB/T20544.--2Q06 Selection Guidelines for Special Environmental Conditions Part 1: Metal Surface Protection 3 Classification of Polymer Materials
The polymer materials involved in this part mainly include three categories: plastics, rubber and coatings. Classification of Use Environment
The use environment is divided into the following three categories:
Indoor environment in dry heat, dry heat desert, and primitive areas:
Outdoor environment in plateau areas:
Outdoor environment in dry heat and dry heat desert areas. 5 Requirements for polymer materials in the use environment
5.1 Polymer materials used in plateau environments should adopt low temperature resistant formulas. 5.2 Polymer materials used outdoors in plateaus should first use materials that are not sensitive to ultraviolet rays, and secondly use materials with added ultraviolet absorbers.
5.3 Polymer materials used in plateau environments should use materials that are not sensitive to ozone. 5.4 Polymer materials used in dry heat desert environments should use materials with good resistance to high temperature, low temperature and temperature denaturation. 1
GB/T 20644.2—2006
5.5 Technical requirements for coating materials, see GB/T20644.1—20066 Selection of polymer materials
6.1 Selection of plastics
For commonly used plastics under dry heat, dry hot desert and plateau environmental conditions, see Appendix A. 6.2 Selection of rubbers
For commonly used rubbers under dry heat, dry hot desert and plateau environmental conditions, see Appendix B. 6.3 Selection of coatings
For the selection of metal surface coatings under dry heat, dry hot desert and plateau environmental conditions, see GB/T20644.1—2006. 7 Selection of test evaluation items
For the selection of high-quality material evaluation items under dry heat, dry hot desert and plateau environmental conditions, see Table 1. Table 1 Evaluation items of polymer materials
Item category
Mechanical properties
Appearance properties
Optical properties
Electrical properties
Item name
Tensile strength, elongation at break, bending strength, tear strength, notched impact strength, ball drop impact strength Gloss, color, powdering, cracks, deformation, hardness, whether there are folded objects, whether the surface is sticky Light protection rate, thickness, refractive index, birefringence Dielectric strength, dielectric constant, dielectric loss tangent, surface resistivity, volume resistivity, electrical resistance Applicable only to transparent or translucent polymer materials. 8 Selection of test methods
Combination. 1 Natural atmospheric exposure test
The atmospheric exposure test of plastics and their products shall refer to GB/T3681-2000, the atmospheric exposure test of rubber and its products shall refer to GB/T3512-2001: the atmospheric exposure test of layered fire shall refer to GB/T9276--1996. 8.2 Artificial simulated environmental test
Under dry heat, dry hot desert and plateau environmental conditions, the parameters of artificial simulated environmental test of polymer materials shall be different from those in other regions. In addition, some artificial simulated test items not available in other regions are added, such as sand and dust test, etc. For details, refer to GB/T 20643. 3-2006.
B.3 Other performance tests
For other performance tests, refer to the corresponding national standards. 2
Appendix A
(Informative Appendix)
Plastic materials commonly used under dry heat, dry desert and plateau environmental conditions GB/T20644.2--2006
Plastics commonly used under dry heat, dry hot desert and plateau environmental conditions with good mechanical properties, chemical stability and weather resistance are shown in Table A.1||tt ||Table A, 1 Common plastic materials under dry heat, dry heat desert and plateau environmental conditions Plastic types
Low-density vinyl
High-density vinyl
Polyamide
Polyester resin
Carbonate
Polymethyl acrylate
Methyl acrylate
Polyphenylene ether
Features
Weather resistance is poor, mechanical strength, intermixing property, gas barrier and solvent resistance are poor; ductility, electrical insulation and transparency are good bzxz.net
It has high rigidity and sealing, excellent mechanical properties, good solvent resistance, good resistance to permeability and resistance to stress cracking
High softening point, good heat resistance, good rigidity, good wear resistance, good electrical insulation and chemical stability; poor low-temperature impact resistance, poor jaw resistance
Poor weather resistance. Poor light resistance and chemical resistance; good dimensional stability, good transparency, good electrical insulation, not impact resistant. Brittle and easy to crack, not heat resistant, poor resistance to insensitivity
Good rollover, good wear resistance , excellent self-lubricating property, electrical insulation applicable environment
Mainly used in
dry heat, dry cooked sand buns and plateau households
packaging films, wires, cables, pipes, indoors
plateau, dry heat, dry hot desert environment
Applicable both indoors and outdoors
Dry heat, hot sand desert indoors
Applicable indoors to dry heat, dry hot desert
Good thermal insulation, no polarity drop, high water absorption, dimensional stability under heat, dry hot sand film and plateau households||t t||Poor stability, poor light resistance, strength drops rapidly and becomes brittle under light blocking
Good toughness, high mechanical strength, good heat resistance, excellent low temperature flexibility, excellent electrical insulation, but poor dielectric constant. Cannot be used for high voltage insulation: Excellent weather resistance, can be used outdoors for a long time
Good transparency, good dimensional stability, impact toughness is the first among general thermoplastics, good heat resistance, low water absorption, good dielectric properties, oil and acid resistance; poor stress cracking, high notch sensitivity; poor UV resistance, But it has good ozone resistance, excellent optical properties and weather resistance, can be exposed to the outdoors for a long time, light and strong. Good surface gloss, good chemical resistance, but strong notch sensitivity, small elastic modulus, low surface hardness
Good dimensional stability, excellent hydrolysis resistance and acid, sensitivity, salt water resistance. Low hygroscopicity. Excellent electrical insulation, outstanding anti-denaturation; poor antioxidant, aldehyde added antioxidants are suitable for plateau, dry heat, dry heat desert indoors
Long-term application
Normal hot dry heat blanket Indoors and outdoors in deserts, plateaus, dry and hot environments, indoors for long periods of time, dry and hot, dry and hot sand, plateau environments, indoors and outdoors, containers, etc., hollow products, high-strength and ultra-strong films, some pipes, stretch belts, industrial seasonal products, injection moldings, films, fibers, blow molding products, etc., disposable educational supplies, insulating materials, lampshades, instrument shells, tapes, etc., durable Transmission parts that bear stress, seals, sleeves, bearings, etc., audio and video tape composite films, screws, nuts, gears, doors, pipes, wire frames, safety helmets, protective covers, windshields, etc., lampshades, window glass, optical instruments, optical fibers, etc., silent gears, wire skeleton insulation columns, pipes, doors, surgical instruments, etc., GB/T 20644.2—2006, plastic varieties, ABS Resin
Formaldehyde
Polytetrafluoroethylene
Mai A1 continued)
Good comprehensive performance, but poor weather resistance, sensitive to ultraviolet rays, long-term outdoor exposure to aging, discoloration to color cracking, good mechanical properties and rigidity. Excellent resistance to fatigue and olefins, wear and tear, good self-lubrication, good thermal stability and chemical stability, good electrical insulation; poor acid and flame resistance, large and unstable post-shrinkage, small dimensional stability, low weather resistance
Excellent wear resistance, excellent heat resistance and cold resistance, almost resistant to all chemicals, solvents, oils and almost all liquids, very elastic, low thermal expansion coefficient
Applicable environment
Dry heat, dry heat desert and high Applicable in the original household
Main uses
Bearings, pipes, automobile parts, gears, electrical housings, instrument housings, etc.
Dry heat, dry heat sand blankets and plateau household electronics, electrical appliances, machinery, automobiles, instruments, construction and daily necessities
Applicable to various retaining rings, support rings, pressure rings, coaxial seals composed of elastomers, anti-moisture sealing belts
(Informative Appendix)
Dry heat, hot desert and plateau environmental conditions Commonly used rubber materials for dry heat, hot desert and commercial original environmental conditions are shown in Table B.1. Table B.1. Commonly used rubber materials under dry heat, dry heat sand and plateau environmental conditions. Rubber varieties. Ten-rate source snake. Aminobutadiene rubber. Butadiene rubber. Ethylene propylene rubber. Nitrile rubber. Urethane rubber. Turethane rubber. Eco co-type. Silicone rubber. HTV/RTV. Main features. Resistance to oxidation, resistance to heat and aging. Excellent heat resistance compared to natural rubber. , but it has low mechanical strength, good elasticity, good weather resistance, oxygen resistance, aging resistance, good oil and solvent resistance, special flame retardancy, poor cold resistance, poor storage stability, small air permeability, small surface elasticity, excellent heat aging resistance, and good oxygen aging resistance, weather aging resistance and chemical stability, as well as power-off performance and electrical insulation, good water resistance. Poor adhesion and white viscosity, heat resistance, cold resistance, weathering resistance and ozone resistance! Excellent
It has good oil resistance, wear resistance, ozone resistance, aging resistance, heat resistance and flame retardant performance
It has good oil resistance, body resistance, tear resistance
, ozone resistance, aging resistance, radiation resistance, but poor heat resistance, 80C will be grouped, not acid and water resistance
Oil resistance, black resistance, two-weather resistance, suitable for oil with low irradiation point, but poor processability, corrosive to mold
Heat resistance, cold resistance, excellent compression permanent deformation and dielectric properties. But low strength
Applicable temperature!
+120 commercial material
Applicable environment
CB/T 20644.2-2006
Main uses
Medium-sized country, plastic kitchen
Oil-resistant products, heat-resistant conveyor belts, acid and alkali resistant high source, heat, 1 hot desert
Hose, bridge bearings, seals, cables
40~+130
Sheath, wire bag, etc.
Automobile inner tube, wire, cable, dynamic isolation-30~
plateau, dry heat, dry onion desert
-45~+150 plateau, T heat, hot sand bun
4D=+120 plateau hand heat, dry heat sand
30~±80 plateau
Separation parts, sealing materials, bag cavity, hose , automobile parts, etc.
Wires, cables, automobile parts, building materials
Widely used in oil seals, seals, composites, etc.
Mainly used in high-pressure lip and pressure-receiving red seed
--40~+135 plateau, in hot, hot sand film "seal oil, 0-shaped, grinding disc 60~+200
dry heat, dry heat desert
high, low temperature and high-speed rotating oil seals and
O-shaped windows
17bzw.cn crisp bear brown dry species Dai jaw red thin Zhang Ke 5· Lake
17izw.com crisp plate peak
quiet species Wo bee pear hair shoes
1 Le Ying 60 infant
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