Some standard content:
HG/T2886--1997
This standard is formulated based on the actual production of manufacturers over the years and the actual needs of the user units. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee Coated Fabric and Products Sub-Technical Committee. This standard was drafted by Shenyang Fourth Rubber Factory and participated in the drafting by Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Kang Jian, Zhang Dong and Zhang Jingzhi. 1 Scope
Chemical Industry Standards of the People's Republic of China
Rubber Dam
Rubber Dam
This standard specifies the technical requirements, sampling, test methods, packaging and marking of rubber dams. HG/T2886-1997
This standard is applicable to rubber dams made of rubber coated fabrics, installed on specific riverbeds and reservoir spillways, and used as movable dams and overflow weirs. The working temperature is 0℃~+70℃ and the height can be adjusted by injection, drainage or air. 2 Reference 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 are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T528—1992 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T1531—1992 Test method for part A hardness of vulcanized rubber (egvISO7619:1986) GB/T5321989 Determination of adhesion strength of vulcanized rubber to fabric (ne4ISO36:1985) GB/T1682—1994 Determination of low temperature brittleness of vulcanized rubber Single specimen method GB/T1689—1982 (1989) Determination of wear resistance of vulcanized rubber (using Ackerman abrasion machine) GB/T1690—1992 Test method for liquid resistance of vulcanized rubber (eqvISO) .1817:1985) GB/T3512-1983 (1989) Rubber hot air aging test method (negISO188:1976) GB/T7762-1987 Vulcanized rubber ozone aging test static tensile test method (ncqISO1431/1:1980) HG/T2580-1994 Rubber plastic coated fabric tensile strength and tear elongation determination (c1VISO1421:1977) 3 Requirements
3.1 The specifications of the rubber dam shall be indicated in the contract according to the hydraulic design requirements of the ordering unit, and the length error of each rubber dam shall be 0-3%. 3.2 The rubber dam includes a dam bag and a bottom gasket, and the physical properties of the rubber material are specified in Table 1. Table! Physical properties of rubber
Tensile strength/MPa
Elongation at break/%
Permanent deformation at break/%
Shore A hardness/degree
Aging resistance to hot air
100cx96 h
Tensile strength/MPa
Elongation at break/%
Yuhuachen#Guo Dang 1007
Not less than
Not less than
Not less than
Not less than
Not less than
External cover rubber
Middle and inner rubber of rubber bag
50～G5
Bottom gasket rubber
107 10 1
Aging in alcohol water
70x95 hWww.bzxZ.net
Brittle temperature/
Volume change rate/5
Tensile strength/MPa
Elongation at break/%
HG/T 2886—1997
Table 1 (end)
Dam bag outer covering rubber
Not more than
Not less than
Not less than
Not higher than
Ozone aging resistance.1: 0phm.40C:-Stretch 20%,2 hAbrasion resistance, Axelrod wear.cm/1. G1 km3. 3 Physical properties of rubber dam coated fabrics are specified in Table 2, not less than
Table 2 Physical properties of coated fabrics
Tensile strength
Tensile strength resistance to hot air aging, 100C×sFhTensile strength resistance to water aging -7%℃×96hThe bonding strength between rubber and fabric/(kN/m) is not less than the bonding strength between rubber and fabric
Water aging resistance, 70Cx96 h/(kN/m) is not less than 3. 4
Between the outer covering rubber and the fabric layer
Between the fabric and the fabric layer
Between the outer covering rubber and the fabric extension
Between the fabric and the fabric layer
In the dam bag, the inner rubber
does not crack
design calculated tensile force is 8 times or more, 1:
is more than 2/3 of the warp
Bottom gasket rubber
warp direction is more than 80% before aging, more than 8 times of the design calculated tensile force
The overlap tensile strength of the coated fabric of the rubber dam dam bag is not less than the tensile strength of the polyester covering fabric itself. The appearance quality of the rubber dam dam is specified in Table 3. Appearance quality of dam bag
Weave cracking
Sponge phenomenon
Inside and outside cover glue
Joint sealing strip
Dam bag coated fabric
Dam investment fabric
Inside and outside cover glue
Coated fabric layer
Overlap seam sealing strip
Inside and outside cover glue
Overlap seam sealing strip
Dam installation coated fabric
Joint between pillow rubber dam plug and dam body
No more than 1/2 of the thickness of the glue layer is allowed within every square meter. The area is not more than 30m1m, 10 1n\No more than five places are allowed within the scope. No more than 100mm2 of the area is allowed within the scope. No more than 5 places are allowed within the scope of 10m2. No more than 5 places are allowed within the scope of 10m2. No more than 5 places are allowed within the scope of 10m2. No more than 5 places are allowed within the scope of 1m2. No more than 5 places are allowed within the scope of 1m2. No more than 5 places are allowed within the scope of 1m2. No more than 100mm2 of the area is allowed within the scope of 10m2. No more than 5 places are allowed within the scope of 1m2. No more than 5 places are allowed within the scope of 1m2. No more than 100mm2 of the area is allowed within the scope of 1m2. No more than 5 places are allowed within the scope of 1m2. No more than 100mm2 of the area is allowed within the scope of 1m2. No more than 5 places are allowed within the scope of 1m2. No more than 100mm2 of the area is allowed within the scope of 1m2. Within 10 m, treatment is allowed--one time is not allowed
Not allowed, but treatment is allowed once after it occurs
4 Sampling
4.1 Sampling plan
HG/T 2886--1997
4.1.1 Each roll of rubber material is a batch, and each batch is tested for tensile strength, elongation at break, permanent deformation at break, and thinness. Heat air aging, water aging, brittle temperature, ozone aging, and abrasion resistance are sampled once every month. 4.1.2 The fabric body is a batch of 1,000 m, and each batch is tested for tensile strength, adhesion strength, hot air aging of tensile strength and water aging, and adhesion strength and water aging of rubber and fabric. Samples are taken once every three months. 4.1.3 Each rubber canal is inspected for appearance quality according to 3.5. 4.1.4 Each rubber dam is inspected for specifications according to the hydraulic design requirements. 4.2 Judgment rules
4.2.1 If any test result of the rubber material is unqualified, double the sample should be taken to repeat the test. If the double test result is still unqualified, it is allowed to be adjusted once. After adjustment, proceed to 3.2 for full test. If the test result of each item is qualified, it is qualified. If any item is unqualified, the batch of products is unqualified.
4.2.2 If any test result of the coated fabric is unqualified, double the sample should be taken to repeat the test. If the double test result is qualified, it is qualified. If it is unqualified, the batch of products is unqualified. 5 Test methods
5.1 The tensile strength, elongation at break and water deformation at break of the rubber material shall be tested according to GB/T 528.
5.2 Rubber hardness
Test according to B/T531.
5.3 Rubber hot air aging
Test according to B/T 3512.
5.4 Rubber water aging resistance
Test according to GB/T 1690.
5.5 Rubber brittle temperature
Test according to GB/T1682.
5.6 Rubber ozone aging resistance
Test according to GB/T 7762.
5.7 Rubber abrasion resistance
Test according to GB/T1689.
5.8 Coated fabric tensile strength and tear elongation according to HG/1 2580
5.9 Test method for hot air aging of coated fabrics
Take single-layer or double-layer vulcanized coated fabrics. Cut 2.5cm or 5.0cm wide specimens in the warp and weft directions, put them in a 100°C hot air aging box for 96 hours, and then test them according to HG/12580.
5.10 Test method for hot water aging of coated fabrics Take single-layer or double-layer vulcanized coated fabrics and cut 2.5cm or 5.0cm wide samples in the warp and weft directions, roll them into an iron container in the test direction, fill them with 70°C hot water, seal them and put them into a 70°C hot air aging box. Take them out after 96 hours and test them according to HG/T2580.GB/T532.
5. 11 The bonding strength of vulcanized rubber and fabrics shall be tested according to GB/T 532.
Preparation of the test sample for the adhesion strength of coated fabrics: single-layer coated fabrics and unvulcanized coated fabrics are placed together, the outer rubber surface and the inner rubber surface are laminated, and the vulcanization conditions corresponding to the finished product are used for vulcanization. Double-layer coated fabrics are tested with vulcanized coated fabrics. 6. Marking, transportation and storage
6.1 Each rubber dam must be accompanied by a certificate of conformity, indicating the product name, number, production date, production unit and standard number. 6.2 Rubber dams are prohibited from being dragged during transportation, and mechanical damage must be strictly prevented, and contact with oils, acids, alkalis and organic solvents must be avoided. 6.3 The long-term storage of rubber dams should be kept between 0℃ and 35℃, and they should be unfolded and overlapped regularly. During the storage period, the rubber surface and bottom gasket of the rubber dam should not be exposed to sunlight, and should be at least two meters away from the heat source.
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