HG/T 2491-1993 Rubber hose for automobile water supply HG/T2491-1993 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Automobile Water Delivery Rubber Hose
1 Subject Content and Scope of Application
HG/T2491-93
Replaces HG4-549-82
This standard specifies the specifications, dimensions, technical requirements, test methods and inspection rules for automotive water delivery rubber hoses. This standard applies to water delivery hoses for automotive engine cooling systems and heating systems. The operating temperature of medium and light-duty rubber hoses is -30℃~110℃; the operating temperature of automotive rubber hoses is -40℃～120℃. 2 Reference standards
GB/T528 Determination of tensile properties of vulcanized rubber and thermoplastic rubberGB/T531
Test method for Shore A hardness of vulcanized rubber
GB/T1682
Test method for brittle temperature of vulcanized rubber
Test method for hot air aging of rubber
GB/T3512
GB/T5562
GB/T5563
GB/T9571
GB/T9573
Physical test method for rubber layer of hose
Hydraulic test method for hose
Rubber and plastic hoses under static conditions Evaluation of ozone resistance Method for measuring dimensions of rubber and plastic hoses and hose assemblies GB9574 Ratio of test pressure, bursting pressure and design working pressure of rubber and plastic hoses and hose assemblies GB/T9576 Guide for selection, storage, use and maintenance of rubber and plastic hoses and hose assemblies GB/T9577 Marking, packaging and transportation rules for rubber, plastic hoses and hose assemblies HG/T2185 Appearance quality of rubber hoses
3 Product structure, shape and specifications and dimensions
3.1 Structure
Hoses are divided into two categories according to their structure: pure rubber hoses and rubber hoses with added layers. 3.2 Shape
Hoses are divided into two categories: straight and special-shaped. 3.3 Specifications, dimensions and tolerances
The inner diameter, wall thickness and allowable tolerance of the hose shall comply with the provisions of Table 1. If otherwise required, it shall be determined by the manufacturer and the user through consultation. Approved by the Ministry of Chemical Industry of the People's Republic of China on July 5, 1993 and implemented on December 1, 1994
3.4 Length and tolerance
HG/T2491-93
Wall thickness and tolerance
Pure rubber hose wwW.bzxz.Net
The length and tolerance of the hose are shown in Table 2,
Length (mm)
Tolerance, %
Below 65
3.5 Product marking
Marking content ：Name, specification, standard number marking example:
Automotive water delivery rubber hose
4 Technical requirements
Reinforced hose
Below 200
Below 400
HG/T2491
025×1000
Wall thickness and tolerance
Pure rubber hose
400~1000
Standard number
4.1 Appearance
Should meet the requirements of HG/T2185. If there are special requirements for the appearance quality of the hose, it can be determined by negotiation between the supply and demand parties. 4.2 The physical and mechanical properties of the rubber compound and the finished hose shall comply with the provisions of Table 3.
Reinforced hose
Above 1000
Physical properties of hose
Hardness, Shore A, degree
Tensile strength, MPa
Elongation at break, %
Brittle temperature, -30℃ (passenger car -40℃)
HG/T2491-93
Ozone resistance, (50±5) mPa, (70±2) h×(40±2)℃Tensile strength change rate, %
Hot air aging 110℃×72h
(passenger car 120℃×72h)
Elongation at break change rate, %
Hardness Change
Adhesion strength, kN/m
Burst pressure, MPa
Test L force, 0.1MPa, change rate of outer diameter, % Note:
①No adhesion strength test for hoses with inner diameter of 19mm and below
Pure hose
Reinforced hose
Inner rubber layer
No cracks
No cracks
Below +20
Outer rubber layer
②Under standard atmospheric pressure (101kPa) and 273K, a concentration of 1pphm is equivalent to a partial pressure of 1.01mPa, and 50mPa is equivalent to 50pphm. Test method
Appearance quality inspection shall be carried out in accordance with HG/T2185. Product specification and size measurement shall be carried out in accordance with GB/T9573. Hardness test shall be carried out in accordance with GB/T531.
5.4 Tensile performance test, according to GB/T528. 5.5 Elastic temperature test, according to GB/T1682. 5.6 Ozone resistance test, according to GB/T9571. Hot air aging test, according to GB/T3512. 5.7
5.8 Adhesion strength test between hose layers, according to GB／T5562. Hydraulic test, according to GB/T5563 and GB9574. 5.9
6 Inspection rules
6.1 The appearance and dimensions of hoses shall be checked one by one according to the provisions of 3.3 and 4.1 of this standard. 6.2 The quality inspection department of the manufacturer shall conduct batch inspection of hoses. The quantity of each batch shall not exceed 5,000. Each batch of products must be accompanied by a quality certificate before leaving the factory.
6.3 Select one specification from each batch of hoses as a representative, and select one of them to check the various properties according to the provisions of Table 4, and do it once a month.
HG/T2491-93
6.4 If the tested performance is unqualified, double samples should be taken from the batch of hoses. If one item or one sample is still unqualified after retesting the unqualified items, the batch of products will be unqualified. Marking, packaging, transportation and purchase and storage
According to GB/T9576 and GB/T9577, if there are special requirements, they shall be agreed upon by the supply and demand parties. Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Rubber Factory of Jilin Chemical Industry Corporation. The drafters of this standard are Ma Wenqin, Wang Lijie, Wang Baozhu, Sun Guizhen and He Yunji. This standard adopts the Japanese Industrial Standard JISD2602-1982 "Automobile Water Hose".
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