GB/T 6739-2006: Paints and varnishes -- Determination of film hardness by pencil test

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Scope

1.1 This Standard is one of series-standards of sampling and test that are related to paints,
varnishes and related products.
This Standard specifies a method for determining the film hardness by pushing pencils of
known hardness over the film.
This test can be performed on a single coating of a paint, varnish or related product, or on
the upper layer of a multi-coat system.
1.2 This rapid and economic test method is effective in comparing the pencil hardness of
different coatings.
It is more effective in providing relative ratings for a series of coated panels exhibiting
significant differences in pencil hardness.
This method is applicable only to smooth surfaces.

Basic Data

Standard ID	GB/T 6739-2006 (GB/T6739-2006)
Description (Translated English)	Paints and varnishes -- Determination of film hardness by pencil test
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G50
Classification of International Standard	87.040
Word Count Estimation	12,148
Date of Issue	2006-12-29
Date of Implementation	2007-06-01
Older Standard (superseded by this standard)	GB/T 6739-1996
Quoted Standard	GB/T 3186; GB/T 9271; GB/T 13452.2; GB/T 20777
Adopted Standard	ISO 15184-1998, IDT
Regulation (derived from)	Announcement of Newly Approved National Standards No. 13 of 2006 (No. 100 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard applies to paint, varnish or related product sampling and testing. This standard specifies a push on the film by a known label pencil hardness measured film hardness approach. This test can Paints, varnishes and related products on a single coat, multi- coating system can also be layered on top. This fast, economical test method used to compare different pencil hardness of the coating is effective. This method is a significant difference for the pencil hardness of the series has been painted to provide a relatively grading test plate is more effective. This method applies only to smooth surfaces.