This guide covers the proper selection and use of procedures for testing varnishes. Properties of liquid varnishes that may be tested are as follows: appearance; color (Gardner, tristimulus, and Platinum-Cobalt scale); viscosity (Gardner-Holdt bubble time, Ford cup efflux, and high precision kinematic viscosity); specific gravity; volatile content; nonvolatile matter; flash point (tag closed-cup, Pensky Martens, tag open-cup, and Setaflash closed tester); skinning; acid value; reactivity of paint liquids; quantitative rosin content; and qualitative rosin content (Lieberman-Storch and Halphen-Hicks). Drying and curing properties that may be tested are drying and print free time. Finally, properties of dry varnish that may be tested are as follows: gloss (specular gloss and reflective haze); resistance of dried films to water and alkali; abrasion resistance by carborundum air blast, falling abrasive, and Taber abraser; exterior durability; color of dried film; and clear floor sealers.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This guide covers the selection and use of procedures for testing varnishes. Some test methods are included, but most sections refer to specific ASTM test methods.

1.2 Varnishes may be applied under such diverse conditions to so many different surfaces and their dried films may be subjected to so many kinds of wear and exposure, that it is not possible to assure desired performance from a single selection of test methods and numerical results. Those skilled in varnish technology may find partial assurance of obtaining desired qualities in various types of varnishes through careful selection of the methods covered and intelligent interpretation of results.

1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

Keywords

drying and curing properties; varnish acid value; varnish flash point; varnish nonvolatile contents; varnish physical properties; varnish specific gravity; varnish volatile contents; varnish viscosity; Testing methods--paints/related coatings; Varnishes;

ICS Code

ICS Number Code 87.040 (Paints and varnishes)

Citing ASTM Standards

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