ISO 4451-1980 rus PDF

Full title and description

St ISO 4451-1980 (ISO 4451:1980) — Polyethylene (PE) pipes and fittings — Determination of reference density of uncoloured and black polyethylenes. This standard specifies a reference test procedure and reporting requirements for determining the reference density used in specification and quality control of PE pipe and fitting materials.

Abstract

This 1980 International Standard defines a laboratory method to determine the reference (bulk) density of polyethylene grades used in piping and fittings, covering both uncoloured and carbon‑black filled (black) materials. The method provides a consistent basis for material specification, comparison and conformity assessment in manufacture and testing of PE pipe systems.

General information

• Status: Withdrawn.
• Publication date: March 1980.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.20; 23.040.45 (plastics pipes and fittings).
• Edition / version: Edition 1 (1980).
• Number of pages: 4.

Key bibliographic and status details are taken from the ISO record for ISO 4451:1980.

Scope

The standard covers the determination of a laboratory reference density value for polyethylene materials used in pipes and fittings. It applies to both uncoloured polyethylene and polyethylene containing carbon black (commonly used as UV stabiliser for black PE). The procedure is intended for use by test laboratories, manufacturers and conformity assessment bodies to establish a reference density for product specifications and material comparison. Note: the published ISO record shows this standard has been withdrawn and is not listed with a direct replacement.

Key topics and requirements

• Definition and purpose of a reference density for PE pipe materials.
• Applicability to uncoloured and carbon‑black (black) polyethylene grades.
• Basic test apparatus and conditioning requirements (general laboratory practice for density measurement).
• Procedure outline for obtaining a repeatable reference density value and rounding/reporting conventions.
• Instructions for reporting results and for inclusion of reference density in material certificates and product specifications.

Typical use and users

Typical users include materials laboratories, manufacturers of polyethylene pipes and fittings, quality / conformity assessment personnel, standards committees preparing product specifications, and regulators or purchasers specifying PE piping materials. The method is used for material characterization, quality control and for comparing batches or formulations against specification limits.

Related standards

Related standards concern test methods and property requirements for thermoplastic pipes and fittings (examples include other ISO standards in the plastics pipes ICS groups such as methods for melt flow, tensile properties and related PE pipe specifications). Regional or national documents providing current test methods and material specifications (for example, standards catalogs and similar-method standards) may be referenced as updated alternatives since ISO 4451:1980 has been withdrawn.

Keywords

polyethylene; PE; pipes; fittings; reference density; density determination; uncoloured polyethylene; black polyethylene; test method; ISO 4451:1980.

FAQ

Q: What is this standard?

A: ISO 4451:1980 is an International Standard titled "Polyethylene (PE) pipes and fittings — Determination of reference density of uncoloured and black polyethylenes", providing a laboratory procedure to determine a reference density value for PE materials used in pipes and fittings.

Q: What does it cover?

A: It covers the method for obtaining a reference (bulk) density for uncoloured and carbon‑black filled polyethylene grades used in pipe and fitting manufacture, and guidance on reporting the result for specification and conformity purposes.

Q: Who typically uses it?

A: Materials test laboratories, pipe and fitting manufacturers, quality-control personnel, standards developers and purchasers who need a reproducible reference density for material specification and comparison.

Q: Is it current or superseded?

A: ISO 4451:1980 is listed as Withdrawn in the ISO bibliographic record. Available catalog records indicate it was withdrawn and that users should consult more recent, current standards or regional equivalents for up‑to‑date test methods; some catalog entries state the standard was withdrawn without direct replacement.

Q: Is it part of a series?

A: It belongs conceptually to the body of ISO standards addressing plastics piping systems and test methods (ISO/TC 138 work). Related ISO documents address other test methods (melt flow, tensile properties, etc.) within the plastics pipes and fittings subject area.

Q: What are the key keywords?

A: Polyethylene, PE pipes, fittings, reference density, density determination, uncoloured PE, black PE, ISO 4451.