BS ISO 6446-1994 (1999) PDF

Full title and description

STB BS ISO 6446-1994 (1999) — national publication reproducing BS ISO 6446:1994, "Rubber products — Bridge bearings — Specification for rubber materials". This document is a national/translated release that adopts the text of the international standard ISO 6446:1994 (originally published October 1994) for use within the STB national catalog; the underlying International Standard specifies material requirements and test methods for rubber used in elastomeric bridge bearings (plain-pad or laminated types).

Abstract

This standard specifies requirements for rubber materials used in elastomeric bridge bearings, including options for polymer type (typically chloroprene CR or natural rubber NR), hardness and shear-modulus requirements, prohibition of reclaim rubber, methods of test and procedures to prepare test pieces from finished bearings. It does not cover the design of complete bearings (dimensions and tolerances) except where complete bearings are used as sources of test specimens.

General information

• Status: Published / active as an international standard; ISO 6446:1994 was confirmed in ISO systematic review (confirmed in recent reviews). The STB national publication reproducing the BS/ISO text is shown in catalogs as a 1999 release.
• Publication date: Original ISO publication: October 1994 (ISO 6446:1994). National (STB) / BS reproduction referenced 1999 in national catalogs (BS adoption documents published by BSI appeared mid-1990s).
• Publisher: Original: International Organization for Standardization (ISO). National reproduction: STB (national standards publisher) reproducing the BS ISO text; British adoption/publisher: BSI for the BS ISO edition.
• ICS / categories: 93.040 (Bridge construction) and 83.140.99 (Other rubber and plastics products).
• Edition / version: ISO 6446:1994 — Edition 1 (1994). National reproduction shown as STB BS ISO 6446-1994 (1999) indicating an adoption/publication in 1999.
• Number of pages: ISO original: 8 pages (ISO bibliographic record). National/BS formatted copies commonly list a longer pagination for the published national front matter (examples show national BS copies as ~18 pages). Use the edition you hold to confirm exact page count for that publication.

Scope

Specifies material specification requirements and test methods for rubber used in elastomeric bridge bearings (plain-pad or laminated). Covers composition (typically CR or NR unless otherwise declared), permitted properties (hardness range and/or shear modulus), prohibition of reclaim/vulcanized waste in the rubbers, sampling and specimen preparation from finished bearings, and the test methods for physical and mechanical properties required to verify conformance. The standard deliberately excludes design details of complete bearings (dimensions and tolerances) unless the complete bearing is the source of test specimens.

Key topics and requirements

• Material designation and composition: typical base polymers (chloroprene CR or natural rubber NR) and disclosure requirements for other polymer types.
• Performance properties: hardness (IRHD) ranges and/or shear-modulus specifications with tolerances.
• Prohibition on the use of reclaim or vulcanized waste in specified rubber compounds.
• Test methods: sampling, preparation of test pieces from finished bearings, and referenced laboratory tests (tensile, tear, compression/creep, hardness, etc., referencing relevant ISO test-method standards).
• Options and selections: the standard includes optional requirements (for example low-temperature performance choices) allowing the purchaser to select appropriate options for local service conditions.

Typical use and users

Used by bridge and civil engineers, specifiers, procurement officers, bearing manufacturers, materials laboratories and testing houses to specify and verify the rubber material used in elastomeric bridge bearings. Also used by national standards bodies and conformity assessment bodies when adopting or transposing ISO material requirements into national publications.

Related standards

Related and referenced documents include ISO test-method standards for rubber (examples: ISO 34-1 and ISO 37 for tear and tensile tests, ISO 2781 for density, and other ISO rubber test-method standards referenced in the standard). National adoptions and equivalents exist (for example SANS adoption and GOST/Interstate adoptions that reproduce ISO 6446:1994 text). Purchasers should also consult standards on bearing design and structural bridge design that complement material specifications.

Keywords

rubber products; bridge bearings; elastomeric bearings; rubber materials; material specification; hardness; shear modulus; test methods; ISO 6446; BS ISO 6446; STB adoption.

FAQ

Q: What is this standard?

A: It is the material-specification standard ISO 6446:1994, reproduced in national form as STB BS ISO 6446-1994 (1999) — specifying rubber-material requirements and test methods for elastomeric bridge bearings.

Q: What does it cover?

A: It covers the composition, required properties (hardness and/or shear modulus), prohibition of reclaim rubber, specimen preparation and test methods needed to verify the rubber material used in bridge bearings. It does not define bearing dimensions or detailed design rules for complete bearings.

Q: Who typically uses it?

A: Bridge engineers, bearing manufacturers, materials laboratories, standards bodies and procurement/specification teams who need a validated material specification for elastomeric bridge bearing rubber.

Q: Is it current or superseded?

A: The ISO bibliographic record shows ISO 6446:1994 as published in October 1994 and later confirmed through ISO periodic review actions (the ISO record indicates confirmation events). Users should check the copy they hold (national edition date) for any later amendments or national replacements; some national bodies have issued identical or updated adoptions (examples: SANS adoption and later GOST/Interstate adoptions).

Q: Is it part of a series?

A: It sits within ISO technical work for rubber and rubber products (ISO/TC 45, subcommittee SC 4) and references many ISO test-method standards for rubber (e.g., ISO 34-1, ISO 37 and related methods). It should be used alongside bearing-design and bridge-structure standards as appropriate.

Q: What are the key keywords?

A: Rubber, elastomeric bearings, bridge bearings, material specification, hardness, shear modulus, test methods, ISO 6446.