GB/T 39693.7-2022
Rubber,vulcanized or thermoplastic—Determination of hardness—Part 7:Apparent hardness of rubber-covered rollers by Shore-type durometer method (English Version)

Standard No.: GB/T 39693.7-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 39693.7-2022

Scope: This document describes a method for the determination of the apparent hardness (expressed in Shore hardness) of vulcanized rubber or thermoplastic rubber covered rolls, which is only suitable for measurements requiring moderate precision. The method and the instruments used are basically as described in ISO48 4, and the measurement is carried out on the curved surface of the treated rubber roller, not on the flat test piece. This document specifies Shore A and D instruments, the latter used to measure high hardness rubber rollers. NOTE: For some rubber rollers, significant differences in surface rubber thickness may affect the measured apparent hardness.

GB/T 39693.7-2022 Referenced Document

ISO 23529 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
ISO 484 Shipbuilding - Ship screw propellers - Manufacturing tolerances - Part 2: Propellers of diameter between 0,80 and 2,50 m inclusive

2022 GB/T 39693.7-2022 Rubber,vulcanized or thermoplastic—Determination of hardness—Part 7:Apparent hardness of rubber-covered rollers by Shore-type durometer method