1.1 This standard is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products.
It specifies a method for determining the film hardness by pushing pencils of known hardness over the film.
The 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, inexpensive test method has been found to be useful in comparing the pencil hardness of different coatings.
It is more useful in providing relative ratings for a series of coated panels exhibiting significant differences in pencil hardness.
The method is applicable only to smooth surfaces.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the latest editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes C Sampling (GB/T 3186-2006, ISO 15528:2000, IDT)
GB/T 9271 Paints and varnishes - standard panels for testing (GB/T 9271-1988, eqv ISO 1514:1984)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T 13452.2-1992, eqv ISO 2808:1974)
GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing (GB/T 20777-2006, ISO 1513:1992, IDT)
