1、ASTM D3927 87=0759530 0032898=d-j-o?.-0 1 Designation:D 3927-87 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.19103 Reprinted from the Annual Book of ASTM Standards,Copyright ASTM If not listed In the current combined index,will appear in the next edition.Standard Guide fo
2、r State and institutional Purchasing of Paint This standard i s issued under the k e d designation D 3927;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicafes the year of lastre
3、approval.A superscript epsilon(e)indicates an editoriai change since the l a s t revision or reapproval.1.Scope 1.1 This guide aids state and local governments to make logical decisions in purchasing architectural paints on the basis of both quality and cost.1.2 This guide concerns itself primarily
4、with architectural trade sales paints as listed in Annex A2.2 especially whites and tints.Emphasis on this group of products is justified by their preeminence in usage and the difficulty in describing in simple terms requirements applicable to them.NOTE l-With experience much of the logic and many o
5、f the techniques described herein can be found applicable to a broad range of architectural coatings.1.3 Many different methods can be used to select coatings.Three methods are presented in this guide and the user may choose the method or combination of methods best suited to his needs.The three met
6、hods are:Active Ingredients/Cost Ratio Method 4 Performance/Cost Ratio Method 5 Specification Method 6 Sections D 2 197 Test Methods for Adhesion of Organic Coatings by Scrape Adhesion D 2243 Test Method for Freeze-Thaw Resistance of latex and Emulsion Paints D 2244 Method for Calculation of Color D
7、ifferences from Instrumentally Measured Color Coordinates D 2366 Test Method or Accelerated Testing of Moisture Blister Resistance of Exterior House Paints on Wood D 2486 Test Method for Scrub Resistance of Interior Latex Hat Wau Paints D2805 Test Method for Hiding-Power of Paints by Reflectometry D
8、 3258 Test Method for Porosity of Paint Films D 3359 Methods for Measuring Adhesion by Tape Test D 37 19 Test Method for Dirt Collection on Coated Exte-D3928 Method for Visual Evaluation of Gloss or Sheen D 4062 Test Method for Leveling of Paints by Draw-Down D4400 Test Method of Sag Resistance of P
9、aints Using a rior Panels Uniformity Method Multinotch Applicato?2.Referenced Documents 2.1 ASTM Standards:D 344 Test Method for Relative Hidin Power of Paints by the Visual Evaluation of Brushouts D 523 Test Method for.Specular Gloss D562 Test for Consistency of Paints Using the Stormer Viscomete?D
10、659 Method of Evaluating Degree of Chaiking of Exterior Paints D660 Method of Evaluating Degree of Checking of Exterior Paints D661 Test Method of Evaluating Degree of Cracking of Exterior Paints D662 Test Method of Evaluating Degree of Erosion of Exterior Paints D772 Test Method of Evaluating Degre
11、e of Flaking(Scaling)of Exterior Paints D 1475 Test Method for Density of Paint,Varnish,lac-quer,and Related Products D 1640 Test Methods for Drying,Curing,or Film Forma-tion of Organic Coatings at Room Temperature f This guide i s under the jurisdiction of ASTM Commitfee D-1 on Paint and Related Co
12、atings and Materiais and is the direct responsibility of Subcommittee DO1.41 on Government Procurement Criteria for Commercial Paint and Coatings.Current edition approved Aug.28,1987.Published October 1987.Originally published as D 3927-80.Last previous edition D 3927-80.Annual Book ofASTM Standards
13、,Vol 06.01.3.Products 3.1 It is recommended that standard commercial products offered to the general public for a period of 2 years or produced and sold in accordance with applicable govern-ment specifications be considered for purchase by the methods described in Sections 4,5,or 6.4.Active Ingredie
14、nts/Cost Ratio Method 4.1 This method utilizes,as an indication of quality,the coating composition provided by the manufacturer and is limited to interior and exterior wall paints listed in Annex A2.2.4.2 Only those ingredients considered to contribute di-rectly to quality are considered.The major a
15、ctive ingredients in most paints are vehicle solids or binder and primary hiding pigments.4.2.1 The weight percent of vehicle solids may help to predict the scrubbability or cleanability of a paint,but the quantity of pigment must also be considered.In general,the greater the ratio of vehicle solids
16、 to pigment,the better the scrubbability and cleanability WU be.The ratio of vehicle solids volume to pigment volume is a more useful parameter but is not readily available.Moreover,each type of vehicle solids,such as alkyd in solvent-borne paints and vinyl or acrylic latex in waterborne paints,has i t s own properties and there are many other additives not shown that can affect scrubbability,cleanability,and other properties.I NOTICE:This standard has either been superseded and replaced by a ne
