GB/T 6036-2020Rubber, vulcanized or thermoplastic. Determination of low-temperature stiffening(Gehman test) (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1:1-2009:

This standard replaces GB/T 6036-2001 "Determination of Low Temperature Rigidity of Vulcanized Rubber or Thermoplastic Rubber (Gimen Test)", and

Compared with GB/T 6036-2001, the main technical changes are as follows:

---Improved the accuracy requirements for temperature measuring devices (see 4:5, 3:4 in:2001 edition);

---Modified the time requirements of the measurement interval in the case of continuous heating (see 7:2, 7:3, and 5:3, 5:4 of the:2001 edition);

---Added the principle (see Chapter 3);

---Added calibration specifications (see Appendix A):

This standard uses the translation method equivalent to ISO 1432:2013 "Determination of Low-temperature Rigidity of Vulcanized Rubber or Thermoplastic Rubber (Gimman Test)

Test)":

This standard was proposed by the China Petroleum and Chemical Industry Federation:

This standard is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35):

Drafting organizations of this standard: Shenyang Rubber Research and Design Institute Co:, Ltd:, Guangzhou Synthetic Materials Research Institute Co:, Ltd:, Jiangsu Mingzhu Testing Machine

Machinery Co:, Ltd:, Jiangsu Xinzhenwei Testing Machinery Co:, Ltd:, Qingdao Junxiang Technology Co:, Ltd:, Beijing Rubber Industry Research and Design Institute Co:, Ltd:

Company, High-speed Rail Testing Instruments (Dongguan) Co:, Ltd:, Dongguan Songshu Testing Instruments Co:, Ltd:, Sailun Group Co:, Ltd:

1 Scope

This standard specifies the determination of the relative stiffness of vulcanized rubber or thermoplastic rubber in the static process from room temperature to -150°C:

The method of sexual characteristics is also called the Gimen test:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this document.

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 25269-2010 Rubber test equipment calibration guide (ISO 18899:2004, IDT)

ISO 23529 Rubber-General procedures for the preparation and adjustment of rubber physical test methods (Rubber-General proceduresforpre-

paringandconditioningtestpiecesforphysicaltestmethods)

3 Principle

Starting from low temperature, the torsional stiffness is measured as a function of temperature: The rigidity measurement method is to combine the sample with the calibrated spring wire

When connecting, when twisting the top of the steel wire 180°, measure the twisting angle of the sample:

4 Test equipment

4:1 Torsion device

As shown in Figure 1, it is composed of a twisting head that can twist 180° in a plane perpendicular to the twisted steel wire: The top of the wire is fixed to

Turn on the head: The bottom of the steel wire is connected to the sample holder: An electrical or mechanical method should be provided to display or record the angle "without friction"

The high-speed device can adjust the zero point conveniently and accurately: The display or recording system should be able to read or record the twist angle to the nearest degree:

4:2 Torsion wire

The steel wire is made of tempered spring steel wire, and its length is 65mm+/-8mm: The torsion constant of the steel wire is 0:7mN.m,

2:8mN.m and 11:2mN.m: In case of dispute, a steel wire with a torsion constant of 2:8mN.m should be used:

4:3 Sample holder

The frame is made of material with poor thermal conductivity and is used to fix the sample vertically in the heat transfer medium: The structure of the sample holder can hold multiple test