ISO 7784-2-2023 PDF

Full title and description

Paints and varnishes — Determination of resistance to abrasion — Part 2: Method with abrasive rubber wheels and rotating test specimen. This international standard specifies a laboratory test method in which two loaded, freely rotatable but eccentrically arranged abrasive rubber wheels act on a rotating specimen to produce a reproducible wear zone for quantifying coating abrasion resistance.

Abstract

ISO 7784-2:2023 defines a repeatable procedure to evaluate the resistance to abrasion of dry coatings using abrasive rubber wheels on a rotating test specimen; results are typically expressed as mass loss or other agreed metrics after a defined number of cycles. The method is intended for development, quality control and specification of paints and varnishes.

General information

• Status: Published.
• Publication date: 3 February 2023 (ISO publication, Edition 3).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 87.040 (Paints and varnishes).
• Edition / version: Edition 3 (2023).
• Number of pages: 8 pages.

Scope

This document specifies a laboratory method for determining the resistance to abrasion of coatings where two loaded, freely rotatable, eccentrically mounted abrasive rubber wheels contact a rotating specimen, producing an annular wear zone. The standard covers specimen preparation, apparatus, test procedure, conditioning, number of cycles, measurement (commonly mass loss) and reporting. It is intended for paints, varnishes and related coating systems.

Key topics and requirements

• Test principle: two abrasive rubber wheels press eccentrically onto a rotating specimen and abrade the coating; abrasion quantified by mass loss or agreed parameter after specified cycles.
• Apparatus and key settings: turntable speed typically (60 ± 2) min⁻¹; eccentric offset ≈ (19.05 ± 0.3) mm; wear zone width about 13 mm; wheel bore and diameter tolerances specified. Dust extraction positioning and wheel mounting details are included.
• Abrasive wheels: rubber discs with abrasive granulate; wheel dimensions, hardness and dressing procedure (initial dressing cycles and periodic re-dressing) are specified to ensure reproducibility.
• Specimen preparation and conditioning: film thickness measurement and substrate preparation requirements are referenced to related ISO methods and included in the procedure.
• Reporting and precision: the standard specifies how to report test conditions, number of cycles, measured loss and any deviations; precision and repeatability notes are provided.

Typical use and users

Used by coating manufacturers, quality laboratories, independent test houses, specification authors and R&D groups to compare abrasion resistance, support product development, verify conformance to specifications, and assist in material selection for wear-prone applications (industrial coatings, protective finishes, automotive and marine coatings, etc.). Test houses use this method when a standardized, repeatable rotating-wheel abrasion result is required.

Related standards

ISO 7784 is a multipart series covering wheel-based abrasion tests; notable related parts include ISO 7784-1 (abrasive paper on rubber wheel, rotating) and ISO 7784-3 (abrasive-paper covered wheel with linearly reciprocating specimen). The 2023 Part 2 replaces the 2016 edition. Other complementary standards referenced for film thickness and conditioning include ISO 2808 and ISO 3270 (as cited within the procedure).

Keywords

abrasion resistance; paints and varnishes; abrasive rubber wheel; rotating specimen; turntable abrasion tester; mass loss; coating durability; ISO 7784-2; test method.

FAQ

Q: What is this standard?

A: ISO 7784-2:2023 is the international standard that specifies a laboratory method for determining the abrasion resistance of coatings using abrasive rubber wheels on a rotating specimen.

Q: What does it cover?

A: It covers the test principle, required apparatus and dimensions, abrasive wheel characteristics, specimen preparation and conditioning, test procedure (including cycles and speeds), measurement (commonly mass loss) and reporting to produce reproducible abrasion-resistance data.

Q: Who typically uses it?

A: Coating manufacturers, independent test laboratories, QC and R&D teams, and specification writers who need standardized, comparable abrasion-resistance data.

Q: Is it current or superseded?

A: Current — ISO 7784-2:2023 (Edition 3) was published in February 2023 and supersedes the previous ISO 7784-2:2016 edition.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 7784 series of abrasion-resistance tests (other parts cover variants using abrasive paper on rubber wheels and linear reciprocation).

Q: What are the key keywords?

A: Abrasion resistance, paints and varnishes, abrasive rubber wheel, rotating test specimen, turntable abrasion tester, mass loss, coating durability, ISO 7784-2.