BS 3900-A5:1991

This Part of BS 3900 describes a method for assessing the brushing and flow characteristics of paints and varnishes when applied to large areas of closely defined substrates. It can also be used to observe other properties, such as the tendency of the paint or varnish to retract from sharp edges and protuberances, e.g. mouldings, rivet heads, weld seams, etc. with consequent loss of opacity and protective power.

NOTE 1 As an adequate wet edge time is important for brush application to large areas, it is recommended that the wet edge time test in accordance with BS 3900-C1 be carried out in conjunction with this test.

NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.

Method primarily intended to assess brushing and flow characteristics of paints and varnishes when applied to large areas of closely defined substrates. Also used to assess other properties, e.g. the tendancy of the paint or varnish to retract from sharp edges and protuberances.