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JJF 2074-2023: Calibration Specification for International Rubber Hardness Degrees Reference Blocks(Scales N, H, L)
Status: Valid
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| JJF 2074-2023 | English | 289 |
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Calibration Specification for International Rubber Hardness Degrees Reference Blocks(Scales N, H, L)
| Valid |
JJF 2074-2023
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Standard similar to JJF 2074-2023 JJF 2065 JJF 2066 JJF 2064 Basic data | Standard ID | JJF 2074-2023 (JJF2074-2023) | | Description (Translated English) | Calibration Specification for International Rubber Hardness Degrees Reference Blocks(Scales N, H, L) | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 14,171 | | Date of Issue | 2023-10-12 | | Date of Implementation | 2024-04-12 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 2074-2023: Calibration Specification for International Rubber Hardness Degrees Reference Blocks(Scales N, H, L)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
Standard rubber international hardness block (N, H, L scale)
Calibration specifications
(ScalesN,H,L)
Released on 2023-10-12
Implemented on 2024-04-12
Released by the State Administration for Market Regulation
Standard rubber international hardness block
(N, H, L scale) calibration specifications
(ScalesN,H,L)
Replaces JJG666-1990
Appendix 1
Responsible unit: National Technical Committee for Force, Hardness and Gravity Measurement
Main drafting unit: Guangdong Institute of Metrology
Kunshan Innovation Technology Testing Instrument Co:, Ltd:
Participating unit in the drafting: AVIC Beijing Great Wall Measurement and Testing Technology Research Institute
This specification is entrusted to the National Force, Hardness and Gravity Measurement Technical Committee to be responsible for interpretation:
The main drafters of this specification:
Wu Xianglei (Guangdong Institute of Metrology)
Chen Minghua (Guangdong Institute of Metrology)
He Guanglin (Guangdong Institute of Metrology)
Tao Zecheng (Kunshan Innovation Technology Testing Instrument Co:, Ltd:)
Participating drafters:
Shi Wei (AVIC Beijing Great Wall Measurement and Testing Technology Research Institute)
Table of contents
Introduction(Ⅱ)
1 Scope(1)
2 Cited documents(1)
3 Overview(1)
4 Metering characteristics(1)
4:1 Standard block geometry(1)
4:2 Standard block flatness(2)
4:3 Standard block uniformity (2)
4:4 Stability of standard blocks(2)
5 Calibration conditions(2)
5:1 Environmental conditions(2)
5:2 Calibration device(2)
6 Calibration items and calibration methods (2)
6:1 Calibration items(2)
6:2 Check before calibration(3)
6:3 Calibration of dimensions(3)
6:4 Calibration of flatness (3)
6:5 Calibration of hardness values (3)
6:6 Uniformity(3)
6:7 Stability(3)
7 Calibration result expression(3)
8 Recalibration time interval (4)
Appendix A Standard Rubber International Hardness Block Calibration Record Format (5)
Appendix B Standard Rubber International Hardness Block Calibration Certificate Inner Page Format (6)
Appendix C Uncertainty evaluation method and examples of standard rubber international hardness block calibration results (7)
Introduction
JJF 1001-2011 "General Measurement Terms and Definitions", JJF 1071-2010 "Compilation of National Measurement Calibration Specifications"
Rules" and JJF 1059:1-2012 "Evaluation and Expression of Measurement Uncertainty" jointly form the basis for formulating this specification
Series specifications:
During the formulation process of this specification, full consideration was given to GB/T 23651-2009 "Vulcanized rubber or thermoplastic rubber hard
"Introduction and Guide to Hardness Testing", GB/T 6031-2017 "Determination of Hardness of Vulcanized Rubber or Thermoplastic Rubber
(10IRHD~100IRHD)", GB/T 39693:9-2021 "Measurement of hardness of vulcanized rubber or thermoplastic rubber
Part 9: Calibration and verification of durometers", ISO 48-1:2018 "Vulcanized rubber or thermoplastic rubber hardness
Determination of hardness of plastic rubber Part 2: Hardness range 10IRHD~100IRHD》(Rubber, vulcan-
and100IRHD), ISO 48-9:2018 "Determination of hardness of vulcanized rubber or thermoplastic rubber Part 9:
No: and definitions, as well as related technical requirements, technical indicators and inspection methods: This specification gives the standard rubber international hard
Specific calibration conditions, calibration items and calibration methods for the measurement characteristics of the scale block (N, H, L scale):
This specification is revised from Appendix 1 of JJG666-1990 "International Fixed Load Rubber Hardness Tester": with JJG666-
Compared with the:1990 Appendix, the main technical changes in this specification are as follows:
---Convert verification procedures into calibration specifications;
---The hardness tester part of the original regulations is independent of another calibration specification;
---The uniformity requirement of the standard block is changed from 1:2IRHD to 1:0IRHD:
The previous releases of this specification are as follows:
---JJG666-1990:
Standard rubber international hardness block (N, H, L scale)
Calibration specifications
1 Scope
This specification applies to the calibration of standard rubber international hardness blocks (N, H, L scales):
2 cited documents
This specification references the following documents:
GB/T 2941 Rubber physical test methods General procedures for specimen preparation and adjustment
For dated references, only the dated version applies to this specification; for undated references, only the dated edition applies:
The latest version (including all modification orders) shall apply to this specification:
3 Overview
The international hardness of rubber is measured by measuring a steel ball indenter of a certain diameter under a small contact test force and a main test force:
The depth difference pressed into the rubber under the final action is converted into the International Rubber Hardness Unit (IRHD) and indicated:
The difference between N, H and L scales lies in the diameter of the steel ball indenter and the size of the test force: Choose the appropriate one according to the specific use:
appropriate scale: The applicable range of each scale is shown in Figure 1:
Figure 1 Applicable scope of hardness scale
X-hardness (IRHD); aL scale; bN scale; cH scale
N scale: routine hardness test: Suitable for rubber hardness in the range of (35~85) IRHD, and can also be used for hard
Rubber with a temperature in the range of (30~95) IRHD:
H scale: high hardness test: Suitable for rubber hardness in the range of (85~100) IRHD:
L scale: low hardness test: Suitable for rubber hardness in the range of (10~35) IRHD:
The standard rubber international hardness block (hereinafter referred to as the standard block) is the standard for calibrating the rubber international hardness meter:
appliance:
4 Measuring characteristics ①
4:1 Standard block geometry
The geometric size requirements of the standard block are shown in Table 1:
① The technical indicators given in the measurement characteristics article are not used for qualification determination and are for reference only:
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