ISO 6446:1994 PDF

Name: ISO 6446:1994 — Rubber products — Bridge bearings — Specification for rubber materials
SKU: ISO 6446:1994
Price: 25 EUR
Availability: InStock

Rubber products — Bridge bearings — Specification for rubber materials

Название (английский):

ISO 6446:1994

Rubber products — Bridge bearings — Specification for rubber materials

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 13 октября 1994 г.
Издание:: ISO IS 6446 edition 1 version 1
ICS:: 83.140.99

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Описание (английский):

Specifies requirements for rubber materials used in elastomeric bridge bearings, which may be of the plain-pad or laminated type. Also specifies methods of test and describes procedures for the preparation of test pieces from finished bearings. Does not contain aspects relating to design properties and quality control of the complete bearing, except where the complete bearing is used as the source of samples and test pieces to determine properties of the rubber material. Does not include dimensions and tolerances.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 6446:1994 - Rubber products - Bridge bearings - Specification for rubber materials defines material requirements and test methods for rubber used in elastomeric bridge bearings (plain-pad or laminated). The standard focuses on the rubber material (composition, hardness or shear modulus, environmental resistance and test-piece preparation) rather than bearing design, dimensions or full quality-control regimes for the complete bearing. Test pieces may be taken from finished bearings to determine material properties.

Key topics and technical requirements

Rubber types and composition: Recommended base polymers are chloroprene rubber (CR) and natural rubber (NR); the use of other rubbers must be declared. Reclaimed vulcanized waste is not allowed.

Load/deflection control: Material is specified by either shear modulus (quadruple-shear test, ISO 1827) or IRHD hardness - not both. Overall hardness range is 45–75 IRHD; common nominal hardnesses are 50, 60 or 70 IRHD. Example correlation for CR/NR at room temperature: IRHD 50 → ~0.65 MPa, 60 → ~1.0 MPa, 70 → ~1.35 MPa (guidance only).

Environmental resistance: Requirements include ozone resistance (ISO 1431-1 - e.g., 96 h at 40 °C, 20% elongation; ozone 25 or 50 pphm depending on service), and five low-temperature resistance grades (Grade 1 to Grade 5 covering mild to severe cold climates, including down to −40 °C).

Adhesion for laminated bearings: Rubber must form a durable bond to reinforcing layers; adhesion is assessed by direct-peel, overload-deflection or shear-break tests (methods described in the standard).

Quality-control tests: Specified tests include hardness (ISO 48), tensile strength and elongation (ISO 37), compression set (ISO 815) and accelerated ageing (ISO 188). Tear strength and creep resistance are optional tests to be included where relevant.

Test-piece preparation: Procedures for extracting and preparing specimens from finished bearings are defined (ISO 4661-1) so test results reflect in-service material.

Applications and users

ISO 6446:1994 is used by:

Bridge designers and structural engineers specifying elastomeric bearings

Bearing manufacturers and compounders selecting or qualifying rubber compounds

Materials and testing laboratories performing acceptance and QC testing

Procurement and standards writers creating material specifications for infrastructure projects Its practical value is ensuring consistent material performance for load-bearing, weathering, ozone and low-temperature service conditions in bridge bearings.

Related standards (selected)

ISO 1827 - Shear modulus (quadruple shear)

ISO 48 - Hardness (IRHD)

ISO 1431-1 - Ozone resistance

ISO 812 - Low-temperature brittleness

ISO 815 - Compression set

ISO 188 - Accelerated ageing

ISO 4661-1 - Sample preparation

Keywords: ISO 6446:1994, elastomeric bridge bearings, rubber materials, IRHD hardness, shear modulus, chloroprene rubber, natural rubber, ozone resistance, low-temperature resistance, adhesion testing.

ISO 6446:1994 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards (selected)

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