This standard specifies the products, classification, technical requirements, test methods, inspection rules and product marking, packaging, transportation and storage of high-density polyethylene plastics for building cables or other products that meet the same requirements. This standard applies to high-density polyethylene plastics made from high-density polyethylene resin as the main raw material, with the addition of modifiers, antioxidants, light stabilizers, carbon black or pigments and other additives, through mixing, plasticizing and granulation. CJ/T 3078-1998 High-density polyethylene plastics for building cables CJ/T3078-1998 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full Text Information System
People's Republic of China Urban Construction Industry Standard CJ/T3078—1998
High density polyethylene plastics for construction cables
High density polyethylene compounds for construction cable
Published on 1998-12-03
Engineering Construction Standard Full Text Information System
Published by the Ministry of Construction of the People's Republic of China
1999-05-01
Engineering Construction Standard Full Text Information System
CJ/T3078—1998
This standard can cover the requirements for sheath plastics in CJ3058-1996 "Plastic Sheathed Semi-parallel Steel Wire Cable". This standard was proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the Beijing Municipal Engineering Design Institute, the technical unit responsible for urban road and bridge standards of the Ministry of Construction. This standard was drafted by Shanghai Municipal Engineering Design Institute, Shanghai Institute of Polymer Functional Materials, Shanghai Cable Research Institute of the Ministry of Machinery Industry, and Shanghai Pujiang Cable Co., Ltd. The main drafters of this standard are Ma Yuzhen, Cao Zhengkang, Mao Qingchuan, Li Ji'an, and Luo Guoqiang. This standard is entrusted to Shanghai Municipal Engineering Design Institute for interpretation. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Urban Construction Industry Standard of the People's Republic of China High-density Polyethylene Compounds for Construction Cable
High-density Polyethylene Compounds for Construction Cable
1 Scope
CJ/T3078—1998
This standard specifies the product classification, technical requirements, test methods, inspection rules and product marking, packaging, transportation and storage of high-density polyethylene plastics (hereinafter referred to as HDPE plastics) for construction cables or other similar requirements. This standard applies to high-density polyethylene plastics made by mixing, plasticizing and granulating high-density polyethylene resin as the main raw material, adding modifiers, antioxidants, light stabilizers, carbon black or pigments and other additives. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1033—1986
GB/T1040—1992
GB/T1043—1979
GB/T1633—1979
GB/T1842—1980
GB/T2411—1980
Test methods for density and relative density of plastics
Test methods for tensile strength of plastics
Plastic simple beam impact test method
Thermoplastic softening point (Vicat) test method Polyethylene environmental stress cracking test method
Plastic Shore hardness test method
GB/T2828-1986 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB/T3682-1983 Thermoplastic melt flow rate test method GB/T5470-1985| |tt||GB/T7141—1992
GB/T8427—1987
Test method for impact embrittlement temperature of plastics
Test method for hot air exposure of plastics
Test method for color fastness to light of textiles-Xenon arc test GB/T2951.35—1983 Test method for ozone resistance of wires and cables GB/T9352—1988
3 Preparation of compression specimens of thermoplastics
GB12527—1990 Overhead insulated cables with rated voltage of 1 kV and below GB15065—1994 Black polyethylene plastic for wires and cables CJ3058—1996 Plastic sheathed semi-parallel steel wire rope 3 Product classification
3.1 Specifications
The product is black or colored cylindrical particles with a diameter of 3 to 4 mm and a length of 2 to 4 mm or square particles of equivalent volume. 3.2 Classification
According to its color, it is divided into two categories: black and color (other colors except black). Approved by the Ministry of Construction of the People's Republic of China on December 3, 1998, the full text information system of engineering construction standards
Implementation on May 1, 1999
The full text information system of engineering construction standards
4 Technical requirements
4.1 Appearance
The particles are evenly hooked, the surface is smooth, and there are no obvious impurities. It is not allowed to have 3 or more connected particles. 4.2 Physical and mechanical properties
4.2.1 The physical and mechanical properties of black HDPE plastic for construction cables shall comply with the provisions of Table 1. Table 1
Melt flow rate
Tensile strength
Tensile yield strength
Elongation at break
Tensile elastic modulus
Impact strength
Softening temperature
Environmental stress cracking resistance
Brittle temperature
Carbon black dispersion
Dispersion
Absorption coefficient
Heat aging resistance 100℃168h
Tensile strength change rate
Elongation at break change rate
Ozone aging resistance
Elongation 25%, temperature 24℃±8℃
Ozone concentration 0.01～0.15mg/m, exposure 1h artificial climate aging
Aging time: 0~1008h
Change rate of tensile strength
Change rate of elongation at break
Aging time: 504~1008h
Change rate of tensile strength
Change rate of elongation at break
g/10min
Shore D
The physical and mechanical properties of colored HDPE plastics used for building cables shall conform to the requirements of Table 2. 5Test methods
Melt flow rate
Tensile strength
Tensile yield strength
Elongation at break
Engineering Construction Standards Full-text Information System
8/10min
0.942~0.978
≥150
≥1500
≥400
No abnormal change
0.9420.978
Engineering Construction Standards Full-text Information System
Tensile elastic modulus
Impact strength
Softening temperature
Resistance to environmental stress cracking
Brittle temperature
Heat aging resistance 100℃168h|| tt||Change rate of tensile strength
Change rate of elongation at break
Ozone aging resistance
Elongation 25%, temperature 24±8℃
Ozone concentration 0.01~0.15mg/m, exposure 1h artificial weather aging
Aging time: 0~1008h
Change rate of tensile strength
Change rate of elongation at break
Aging time: 504~1008h
Change rate of tensile strength
Change rate of elongation at break
Color fastness to light
5.1 Appearance and dimensions
Table 2 (end)
Shore D
Appearance refers to visual inspection under natural light. Appearance dimensions refer to direct measurement with calipers, accurate to millimeters. 5.2 Physical and mechanical properties
5.2.1 Sample preparation
According to the provisions of GB/T9352.
5.2.1 Density
According to the provisions of GB/T1033.
5.2.3 Melt flow rate
According to the third item in Table 1 of GB/T3682-1983. 5.2.4 Tensile strength, tensile yield strength, elongation at break and tensile elastic modulus shall be carried out in accordance with the provisions of GB/T1040, and the sample shall be type III with a thickness of 1.0mm±0.1mm. 5.2.5 Hardness
According to the provisions of GB/T2411, the hardness shall be measured with a D-type hardness tester. 5.2.6 Impact strength
≥1500
No abnormal change
Performed in accordance with the provisions of GB/T1043, the sample size is based on the notched plate sample, and the pendulum impact speed is 2.9m/s (when the impact energy is <40kJ).
5.2.7 Softening temperature
Performed in accordance with the provisions of GB/T1633, the load is 1kg, and the heating rate is the B item in the GB/T1633-1979 test method. 5.2.8 Environmental stress cracking resistance
Performed in accordance with the provisions of GB/T1842.
5.2.9 Brittleness temperature
According to the provisions of GB/T5470, the test temperature is -76℃, each group is 30 uncut specimens, and 15 or more specimens are qualified if they are not broken.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
5.2.10 Carbon black dispersion
In carbon black dispersion, one of the two items, dispersion and absorption coefficient, can be selected. The carbon black absorption coefficient method is used in arbitration. 5.2.10.1 Carbon black dispersion
The test method is carried out in accordance with the provisions of Appendix A of GB15065-1994. 5.2.10.2 Carbon black absorption coefficient
The test method is carried out in accordance with the provisions of Appendix B of GB15065-1994. 5.2.11 Heat aging
According to the provisions of GB/T7141, the aging temperature is 100℃±2℃, and the time is 168h. 5.2.12 Ozone aging
According to the provisions of GB/T2951.35-1983, elongation is 25%, temperature is 24℃±8℃, ozone concentration is 0.01~0.15mg/m3, exposure is 1h.
5.2.13 Artificial weathering
According to the provisions of Appendix A of GB12527-1990, the aging time is 1008h. 5.2.14 Color fastness to light
According to the provisions of Method 3 of GB/T8427-1987. 6 Inspection ruleswww.bzxz.net
6.1 Batch
HDPE plastics for building cables are inspected in batches. The same batch of raw materials, the same formula, and the same process are used for continuous production, and the weight of each batch shall not exceed 20t.
6.2 Inspection classification
6.2.1 Factory inspection
6.2.1.1 The factory inspection items for black HDPE plastics for building cables are 1, 2, 3, 4, 56, 8, 9, and 12 in Table 1 of Articles 4.1 and 4.2.1.
6.2.1.2 The factory inspection items for colored HDPE plastics for building cables are 1, 2, 3, 4, 5, 6, 8, and 9 in Table 2 of Articles 4.1 and 4.2.2. 6.2.2 Type inspection
Type inspection shall be conducted in any of the following cases, and the items of type inspection shall be all the items specified in the technical requirements: a) Finalization identification of products when the products are transferred to the factory for production; b) After formal production, when the formula, raw materials, and process are changed, which may affect the product performance; c) During normal production, inspection shall be conducted at least once a year; d) When the product is discontinued for more than one year and production is resumed; e) When the factory inspection result is significantly different from the last type inspection; f) When the user requires type inspection; g) When the national quality supervision agency requires type inspection. 6.3 Sampling
Random sampling method shall be adopted.
Appearance sampling shall be conducted in accordance with GB/T2828, see Table 3. Take 0.5kg from each bag of samples for inspection. Physical and mechanical properties inspection shall be conducted in batches, and 1kg shall be randomly selected from each batch for inspection. 6.4 Rules for determining qualified batches
Appearance shall be conducted in accordance with GB/T2828, see Table 3. Adopt 1 normal inspection sampling plan, general inspection level 1, qualified quality level AQL6.5.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Batch Range
91~150
151~280
281~500
501~1200
1201~3200
Sample Size
Qualified Quality Level (AQL) 6.5
Physical and Mechanical Properties are inspected according to Table 1 or Table 2. If there are unqualified items in the inspection results, double sampling should be re-taken from the original batch and the unqualified items should be re-inspected. If all the re-inspection results are qualified, the entire batch is qualified. Otherwise, it is unqualified. 7
Marking, packaging, transportation and purchase and storage
7.1 Marking
A certificate of conformity shall be attached to each package, and the following contents shall be marked on the packaging bag: a) Product name and code, standard number,
b) Manufacturer and address;
c) Registered trademark;
d) Production date and batch number;
e) Heat and moisture proof mark;
f) Net weight.
7.2 Packaging
Building cables are packed in HDPE plastic inner bags with polyethylene plastic film bags, and plastic woven bags or composite bags as outer bags. The net weight of each bag is 25kg±0.2kg.
7.3 Transportation
The product shall not be exposed to the sun or rain during transportation. It shall be kept clean, dry, free of contamination, and the packaging shall be kept intact. 7.4 Storage
The product should be stored in a clean, cool, dry and ventilated warehouse. The storage period is one year from the date of production.1 Marking
Each package is attached with a certificate of conformity, and the following contents should be marked on the packaging bag: a) Product name and code, standard number,
b) Manufacturer and address;
c) Registered trademark;
d) Production date and batch number;
e) Heat and moisture proof mark;
f) Net weight.
7.2 Packaging
Building cables are packed in HDPE plastic inner bags with polyethylene plastic film bags, and plastic woven bags or composite bags as outer bags. The net weight of each bag is 25kg±0.2kg.
7.3 Transportation
The product should not be exposed to the sun or rain during transportation. It should be kept clean, dry, free of pollution, and the packaging should be kept intact. 7.4 Storage
The product should be stored in a clean, cool, dry and ventilated warehouse. The storage period is one year from the date of production. Engineering Construction Standards Full-text Information System1 Marking
Each package is attached with a certificate of conformity, and the following contents should be marked on the packaging bag: a) Product name and code, standard number,
b) Manufacturer and address;
c) Registered trademark;
d) Production date and batch number;
e) Heat and moisture proof mark;
f) Net weight.
7.2 Packaging
Building cables are packed in HDPE plastic inner bags with polyethylene plastic film bags, and plastic woven bags or composite bags as outer bags. The net weight of each bag is 25kg±0.2kg.
7.3 Transportation
The product should not be exposed to the sun or rain during transportation. It should be kept clean, dry, free of pollution, and the packaging should be kept intact. 7.4 Storage
The product should be stored in a clean, cool, dry and ventilated warehouse. The storage period is one year from the date of production. Engineering Construction Standards Full-text Information System
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