EN ISO 12137:2011
Paints and varnishes - Determination of mar resistance (ISO 12137:2011)
Paints and varnishes - Determination of mar resistance (ISO 12137:2011)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 13
- Дата публикации:
- 15 октября 2011 г.
- Издание:
- CEN EN 12137 edition 2 version 1
- ICS:
- 87.040
ISO 12137:2011 specifies a method for determining, using a curved (loop-shaped or ring-shaped) stylus, the mar resistance of a single coating of a paint, varnish or related product, or the upper layer of a multicoat system. This test has been found to be useful in comparing the mar resistance of different coatings. It is most useful in providing relative ratings for a series of coated panels exhibiting significant differences in mar resistance. ISO 12137 does not specify a method using a pointed stylus, two of which are specified in ISO 1528‑1 and ISO 1528‑2, respectively. The choice between the three methods will depend on the particular practical problem.
Abstract
Overview
EN ISO 12137:2011 - Paints and varnishes: Determination of mar resistance specifies a laboratory method to determine the mar resistance of a single coating or the top layer of a multi‑coat system using a curved (loop‑shaped or ring‑shaped) stylus. The standard is intended for comparative testing and provides relative ratings to distinguish coatings that show significant differences in resistance to surface blemishing (mar). It is the consolidated European adoption of ISO 12137:2011.
Key topics and technical requirements
- Scope & purpose
- Measures mar resistance by pressing a curved stylus on a coated panel while moving the panel beneath it; identifies the minimum load that causes marring.
- Best used for relative comparisons of coatings rather than absolute performance in all service conditions.
- Apparatus
- Balanced‑beam mar‑resistance instrument with a stylus holder and sliding table; designed for loads up to 5 kg.
- Load increments: typically 0.5 kg; 0.25 kg or 0.1 kg permitted for greater accuracy near the critical load.
- Stylus specifications
- Loop‑shaped stylus: chromium‑plated steel rod, 1.6 mm diameter, U‑bend with outside radius (3.25 ± 0.05) mm.
- Stylus hardness: Rockwell HRC56–HRC58; surface roughness
Технические детали
- Технический комитет
- CEN/TC 139 - Paints and varnishes
- SKU
- EN ISO 12137:2011
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