ISO 8361-2-1991 PDF

Full title and description

St ISO 8361-2-1991 — Thermoplastics pipes and fittings — Water absorption — Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings. This part of ISO 8361 specifies the particular test conditions, conditioning, immersion and measurement steps to determine water absorption of PVC‑U pipes and fittings, and gives a preferred maximum value for use in product specifications and quality control.

Abstract

Specifies the test conditions for determining the water absorption of unplasticized poly(vinyl chloride) (PVC‑U) pipes and fittings, describes the principle and test procedure and indicates a preferred maximum absorption value. Annex A is informative; absorption values appropriate for specific applications are given in the relevant product standards.

General information

• Status: Published (International Standard, confirmed following periodic review).
• Publication date: September 1991 (1991-09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.20; 23.040.45.
• Edition / version: Edition 1 (1991).
• Number of pages: 3.

Technical committee: ISO/TC 138/SC 5. The standard was last reviewed and confirmed in 2023.

Scope

Defines the specific conditioning, immersion media, temperatures, durations and measurement steps used to determine water absorption of PVC‑U pipes and fittings. It supplements the general test method given in ISO 8361‑1 by prescribing the exact test conditions appropriate to unplasticized PVC; it also gives a preferred maximum water‑absorption value for specification purposes while noting that final application‑specific limits are set in relevant product standards.

Key topics and requirements

• Test principle: prepare and condition test pieces, determine initial mass and surface area, immerse under prescribed conditions and determine mass gain to calculate water absorption per unit area.
• Conditioning and pre‑measurement procedures (as referenced to ISO 8361‑1).
• Specified immersion regime for PVC‑U (including boiling/near‑boiling distilled water immersion and specified times) and controlled cooling before final measurement.
• Expression of results: water absorption reported as mass gain per unit surface area and presented in the test report per ISO 8361‑1.
• Preferred maximum value provided (informative) to assist product specifications — commonly cited guidance value in the standard for acceptance criteria.
• Annex A is informative and provides supplementary guidance; product standards define the absorption values appropriate to specific end uses.

Typical use and users

Used by materials and product engineers, quality control and testing laboratories, manufacturers of PVC‑U pipes and fittings, standards developers, and procurement/specification teams who require a repeatable, internationally agreed method to assess water absorption for conformity assessment, material selection and product development.

Related standards

ISO 8361‑1:1991 — Thermoplastics pipes and fittings — Water absorption — Part 1: General test method (reference method). ISO 8361‑3:1991 — Part 3: Test conditions for ABS pipes and fittings. Other related product and material standards for PVC and thermoplastics (material specifications and product application standards) should be consulted for application‑specific acceptance criteria.

Keywords

water absorption, PVC‑U, unplasticized poly(vinyl chloride), thermoplastics pipes, fittings, test method, immersion test, conditioning, ISO 8361, material testing, quality control.

FAQ

Q: What is this standard?

A: ISO 8361‑2:1991 is Part 2 of the ISO 8361 series; it gives the specific test conditions to determine water absorption of unplasticized poly(vinyl chloride) (PVC‑U) pipes and fittings.

Q: What does it cover?

A: It covers specimen preparation/conditioning, immersion media and temperatures, immersion duration, cooling and measurement procedures, and the calculation and reporting of water absorption for PVC‑U pipes and fittings; Annex A provides informative guidance and a preferred maximum absorption value.

Q: Who typically uses it?

A: Manufacturers, test laboratories, materials engineers, standards writers and procurement/specification teams involved with PVC‑U piping systems and conformity testing.

Q: Is it current or superseded?

A: The 1991 edition (Edition 1) is published and — following ISO's periodic review — was confirmed as current in 2023; users should check applicable product standards for any application‑specific updates.

Q: Is it part of a series?

A: Yes — ISO 8361 is a multipart series. Part 1 is the general test method (ISO 8361‑1:1991) and Part 3 covers ABS (ISO 8361‑3:1991); other parts address other materials as needed.

Q: What are the key keywords?

A: Water absorption, PVC‑U, thermoplastics pipes, fittings, immersion test, conditioning, ISO 8361, test conditions, material testing.