HG 2180-1991 Natural vulcanized rubber sheet for lining of phosphoric acid storage tanks
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG 2180-—91
Natural vulcanized rubber sheet for lining of phosphoric acid storage tanks1991-12-23Promulgated
Ministry of Chemical Industry of the People's Republic of China
Implementation on 1992-05-01
Chemical Industry Standard of the People's Republic of China
Natural vulcanized rubber sheet for lining of phosphoric acid storage tanksSubject content and scope of application
HG2180—91
This standard specifies the specifications and dimensions, technical requirements, test methods, acceptance rules, and marking, packaging, transportation and storage requirements of natural vulcanized rubber sheets for lining of phosphoric acid storage tanks. This standard is mainly applicable to natural vulcanized rubber sheets for lining of large phosphoric acid storage tanks at normal pressure and working temperature below 90℃. The naturally vulcanized rubber sheets used for protection of other chemical equipment against phosphoric acid corrosion should also be implemented in accordance with the same standards. 2 Reference standards
GB1689
GB1690
GB7760
GB9869
Determination of tensile properties of vulcanized rubber
Test method for Shore A hardness of rubber
Determination of wear resistance of vulcanized rubber (using Akron abrasion machine)Test method for liquid resistance of rubber
Determination of adhesion between vulcanized rubber and metalSingle plate methodDetermination of vulcanization characteristics of rubber compoundsDisc oscillation vulcanizer methodGB11211
HG4-859
3 Product specifications
Determination method of adhesion strength between vulcanized rubber and metalTensile methodDetermination method of permanent deformation of vulcanized rubber at fixed elongation (modulus tester method)The specifications and dimensions of rubber sheets shall comply with the provisions of Table 1. Other requirements shall be agreed upon by the supply and demand parties. Table 1
Nominal size
Technical requirements
Allowable deviation, %
Nominal size
Allowable deviation, %
4.1 The rubber sheet should be dense, uniform, with clean surface and neat edges. Under the condition that it does not affect the use, the allowable range of defects of the rubber sheet is as specified in Table 2.
Approved by the Ministry of Chemical Industry of the People's Republic of China on December 23, 1991 and implemented on May 1, 1992
Defect name
Surface impurities
Scars or unevenness
Superior products
No
HG2180-91
First-class products
No more than 5 bubbles per square meter, with a depth not exceeding 1/3 of the thickness and an area not greater than 2mm2, and a depth not exceeding 1/5 of the thickness and a length not exceeding 1 No more than 5 impurities with a depth not exceeding 1/3 of the thickness and no more than 10 bubbles with an area not exceeding 2mm2 per square meter; no more than 5 bubbles with an area not exceeding 5mm2
No more than 5 impurities with a depth not exceeding 1/5 of the thickness and a length not exceeding 2mm per square meter
Slight marks are allowed, and there should be no cracks when bending 90°. The depth or height shall not exceed the allowable deviation of the thickness of the rubber sheet. 4.2 The vulcanization characteristics of the rubber sheet shall meet the following requirements: Test temperature 160℃, 1rol～4min, tgo30～50min. 4.3 The rubber sheet shall be able to vulcanize naturally at room temperature and pressure. After vulcanization under the specified natural vulcanization conditions, its 100% elongation permanent deformation shall not exceed 10%. The natural vulcanization conditions of the rubber sheet may refer to Appendix A. The physical and chemical properties of the vulcanized rubber shall comply with the provisions of Table 3. The vulcanization conditions of the sample are 150℃×30min, 4.4
Hardness, Shore A
Tensile strength, MPa
Elongation at break, %
Abrasion resistance, cm2/1.61km
Adhesion strength between rubber sheet and metal (tear-off), MPaAdhesion strength between rubber sheet and metal ( 90° peeling), kN/m75% phosphoric acid
60℃×12 monthswwW.bzxz.Net
55% phosphoric acid + 5% sulfuric acid
85℃×3 months
50~60℃
50~60°
Weight change rate, %
Volume change rate, %
Weight change rate, %
Volume change rate, %
Superior product
First-class product
Qualified product
HG2180-91
4.5 The rubber sheet should be able to withstand the voltage required for the electric spark pinhole test. 5 Test method
5.1 The specifications and dimensions of the rubber sheet shall be inspected in accordance with the following provisions. 5.1.1 The thickness of the rubber sheet shall be measured with a thickness gauge. The foot diameter of the thickness gauge is 10mm, the applied pressure is 10kPa, and the reading is accurate to 0.01mm. When measuring, 10 points are evenly taken horizontally at a distance of not less than 200mm from the end of the rubber sheet, and the measurement results are taken as the arithmetic mean. 5.1.2 The length and width of the rubber sheet are measured with a tape measure, and the reading is accurate to 1mm. The width measurement is taken at 3 points from the end, and the distance between each point is not less than 1m. The measurement results are taken as the arithmetic mean.
5.2 The appearance quality of the rubber sheet is inspected by visual inspection and corresponding measuring tools. 5.3 The vulcanization characteristics of the rubber sheet are inspected according to the method specified in GB9869. 5.4 The elongation and permanent deformation test of the rubber sheet after natural vulcanization is carried out according to the method specified in HG4-859. 5.5 The physical and chemical performance tests listed in Table 3 are carried out according to the following provisions. 5.5.1 The hardness test is carried out according to the method specified in GB531. 5.5.2 The tensile strength and elongation at break tests are carried out according to the method specified in GB528. 5.5.3 The wear resistance test shall be carried out in accordance with the method specified in GB1689. 5.5.4 The test of the adhesive strength between the rubber sheet and the metal (tensile method) shall be carried out in accordance with GB11211; the 90° peel strength test shall be carried out in accordance with the provisions of GB7760. For the test at a test temperature of 50-60°C, the sample shall be preheated at the specified temperature for 10±1min. 5.5.5 The liquid resistance test shall be carried out in accordance with the provisions of GB1690. 5.6 The insulation test of the rubber sheet shall be carried out in accordance with the provisions of relevant standards. 6 Acceptance rules
6.1 The rubber sheet shall be inspected and qualified by the technical inspection department of the manufacturer in accordance with 6.2, 6.3, and 6.4 and a quality certificate shall be issued before it can be shipped out of the factory. The quality certificate shall include the following contents:
Product name, specification, quantity, grade, batch number and production date; a.
Implementation standard code;
Specific gravity of the rubber sheet;
. Manufacturer's name and trademark;
Inspection mark,
6.2 The specifications and appearance quality of the rubber sheet shall be inspected 100%. 6.3 The vulcanization characteristics test of the rubber sheet shall be conducted with 0.5t as a batch and sampled batch by batch. If there is any failure to meet the requirements of 4.2, double samples shall be taken from the same batch of rubber sheets for retest. If there is still failure to meet the requirements, the product shall be regarded as unqualified. 6.4 The inspection of 1~3 items of the physical and chemical properties specified in Table 3 shall be conducted with 5t as a batch and 4~6 items shall be conducted with 10t as a batch. If there is any failure to meet the requirements of the corresponding grade, the product shall be inspected in descending order from the superior grade. If there is still any failure when it is downgraded to the qualified grade, double samples shall be taken from the same batch of rubber materials for retest of the unqualified items. If there is still any failure in the retest or one sample, the product shall be regarded as unqualified. 6.5＇The fixed elongation permanent deformation test specified in 4.3 of this standard, the liquid resistance tests 7 and 8 specified in Table 3 and the insulation test specified in 4.5 are type inspection items. 7·Marking, packaging, transportation and storage
7.1 The rubber sheet is rolled on the core shaft with plastic film or padding as the isolation layer and suspended in the packaging box. The weight of each box shall not exceed ·80kg.7.2 Each packaging box shall be accompanied by a product card indicating the product name, specification, quantity, grade, batch number and production date, and the inspection pass stamp. The packaging box shall be marked with the sign of "Do not put it upside down\". 7.3 During transportation and storage, the temperature of the rubber sheet shall be kept below 10℃. It is prohibited to contact with organic solvents such as gasoline and kerosene and substances harmful to rubber such as acids and alkalis. Keep it clean and avoid squeezing. HG2180—91
7.4 In compliance with 7.3, the effective shelf life of the rubber sheet is 6 months from the date of production. HG2180--91
Appendix A
Vulcanization conditions of naturally vulcanized rubber sheets
(reference)
The naturally vulcanized rubber sheets specified in this standard can be vulcanized under different conditions such as room temperature or high temperature. The vulcanization conditions should be based on the construction environment as much as possible in accordance with the provisions of Table A1,
Vulcanization method
Natural vulcanization
Natural vulcanization
Forced vulcanization
Forced vulcanization
Additional instructions:
Vulcanization temperature
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Beijing Rubber Products Design Institute. This standard was drafted by Beijing Rubber Products Design Institute and Tianjin Rubber Products Institute. The main drafters of this standard are Lu Wenjing, Zhao Jixiang, Chen Gengxin, Vulcanization time
9~11 weeks
3~6 weeks
10~14d
20~22h
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