GOST 263-75 PDF

Full title and description

GOST 263-75 — "Резина. Метод определения твердости по Шору A" (English: Rubber. Method for the determination of Shore A hardness). The standard specifies a durometer (Shore A) method for determining the indentation hardness of rubber and rubber products, expressed on a 0–100 Shore A scale.

Abstract

GOST 263-75 defines sampling, apparatus, test procedure, measurement timing and result processing for Shore A hardness testing of rubber materials and rubber products. It establishes requirements for the durometer (indenter, spring/load, scale), minimum sample thickness and spacing of measurement points, number of readings and rules for averaging and reporting test results. The method covers hardness values from 0 to 100 Shore A.

General information

• Status: Active / in force (standard in current collections and listed as действующий in Russian standards catalogues).
• Publication date: Approved 1975 (designation year 1975), officially introduced/entered into force 01 January 1977; later reprints/editions published (e.g., printed edition 1988).
• Publisher: State Committee for Standards of the USSR (Gosstandart) / Издательство стандартов (State Standards Publishing).
• ICS / categories: Rubber and plastic industries; ICS 83.060 (rubber).
• Edition / version: Original designation GOST 263-75 (1975); effective from 1977; text includes subsequent amendments published in 1980, 1983, 1986 and 1988 (amendments integrated into reprints).
• Number of pages: 7 pages (concise test method specification).

Scope

This standard applies to rubber and rubber products and establishes a Shore A durometer method for determining hardness from 0 to 100 Shore A. It is intended for use on flat test pieces or product surfaces of sufficient thickness and defines minimum sample geometry, conditioning, measurement locations, instrument requirements and timing for reading the durometer.

Key topics and requirements

• Sampling: requirements for preparing and selecting test pieces and locations on finished products.
• Apparatus: durometer (indenter geometry, hardened-steel indenter, calibrated spring and scale); accessory fixtures or test stands for repeatable pressure application.
• Measurement procedure: placement, pre-load/contact, timing of reading (typical reading after (3 ± 1) s and optional longer contact time such as 15 s), minimum number of measurements per sample and minimum distances between measurement points and edges.
• Result processing: arithmetic mean of multiple readings, rounding rules (to nearest unit), and permissible deviation of individual readings from the mean (commonly ±3 Shore A units as allowed deviation for individual readings).
• Reporting: statement of mean hardness, number of readings, specimen thickness and test conditions (temperature, conditioning), instrument type/scale (Shore A) and any deviations from standard procedure.
• Safety and handling: safe operation of durometer and handling of specimens to avoid injury and measurement errors.

Typical use and users

GOST 263-75 is used by rubber and elastomer manufacturers, quality control and testing laboratories, R&D departments, materials engineers, procurement/specification writers and certification bodies that need a standardized, repeatable method for assessing Shore A hardness of rubber components (e.g., seals, gaskets, hoses, vibration isolators, footwear components). It is also referenced in technical documentation and product standards where Shore A hardness is a specified characteristic.

Related standards

International and regional standards addressing rubber hardness and durometer methods are related and may be referenced for harmonization or updated methods, e.g. ISO 48-4:2018 (Indentation hardness by durometer method — Shore hardness) which modernizes international practice and has replaced earlier ISO documents such as ISO 7619-1:2010 in some catalogs. GOST 263-75 historically replaces ГОСТ 263-53 and cites other normative references (examples: GOST 11358-74, GOST 269-66) used within related testing procedures.

Keywords

GOST 263-75; rubber; Shore A; durometer; hardness; твердость; дюрометр; испытание резины; испытания материалов; ГОСТ.

FAQ

Q: What is this standard?

A: GOST 263-75 is a Soviet/Russian standard titled "Rubber. Method for the determination of Shore A hardness" that prescribes the durometer (Shore A) test method for determining the indentation hardness of rubber and rubber products.

Q: What does it cover?

A: It covers specimen selection and preparation, durometer instrument requirements, test procedure (placement, contact pressure, timing), number and spacing of readings, calculation and reporting of average hardness (0–100 Shore A), and basic safety/handling considerations.

Q: Who typically uses it?

A: Manufacturers of rubber goods, independent and in-house QC/testing laboratories, materials engineers, standards bodies and anyone specifying or verifying Shore A hardness for rubber components.

Q: Is it current or superseded?

A: GOST 263-75 is listed in current GOST collections/catalogues as in force (действует) and remains a referenced national method in many Russian-language technical resources; for international harmonization users often compare or migrate to newer ISO documents governing Shore hardness (for example ISO 48-4:2018). Always check the latest national/regional standards catalogues before formal use.

Q: Is it part of a series?

A: It is part of a family of standards and norms covering rubber testing and properties; it replaced the earlier ГОСТ 263-53 and references other GOSTs for related test methods and material properties. Related international family documents include ISO standards that cover Shore hardness and other hardness/indentation methods.

Q: What are the key keywords?

A: Shore A, durometer, rubber hardness, hardness test, ГОСТ, rubber testing, tвердость, дюрометр.