ASTM D868-10(R2020) pdf free download
ASTM D868-10(R2020) pdf free download.Standard Practice for Determination of Degree of Bleeding of Traffic Paint
1. Scope
1.1 This practice describes test procedures for determining the degree of bleeding of traffic or pavement marking paints. A specific formulation for a solventborne traffic paint formulation is included as a potential bleeding reference control. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 bleeding characteristic, n—that condition of discolor- ation manifested in traffic paint when applied to tar or asphaltic-type substrates. 3.1.1.1 Discussion—The amount of discoloration can be comparing the color of the test coating and a specific reference coating using colorimetric measurements or by visual compari- son to the amount of bleeding in a reference photograph.
4. Significance and Use
4.1 Solvents in a traffic paint may cause bleeding of pavement constituents into the traffic marking, thereby render- ing the traffic marking less effective as a lane or directional indicator. This practice describes how to prepare a panel of the coating to be tested and a reference panel coated with a specific solventborne traffic paint to be used as a control for evaluation. 4.2 This practice can be particularly useful for evaluation of solventborne traffic paints, but it may also be used for other types of traffic markings including waterborne traffic paints. 4.3 Two basic procedures are described for measuring the amount of bleeding. The procedure used shall be agreed upon by the purchaser and seller.
5. Apparatus
5.1 Film Applicator—A conventional type drawdown gage that casts a film having a minimum width of 50 mm (2 in.) and an approximate wet thickness of 380 µm (15 mils) (using an applicator clearance of approximately 760 µm (30 mils)). 5.2 Test Panel for Coal-Tar Substrate—A 127 by 254-mm (5 by 10-in.) piece cut from a standard roll ofso-called “6.8-kg (15-lb) coal-tar saturated heat resistant or rag felt.” Unless otherwise specified, use a Specification D227 coal tar saturated felt. 5.3 Test Panel for Asphalt Substrate—A 127 by 254-mm (5 by 10-in.) piece cut from a standard roll of 6.8-kg (15-lb) asphalt-saturated felt. Unless otherwise specified, use a Speci- fication D226 (Type 1) asphalt saturated felt.5.4 Paint Composition for Use as a Control—The paint composition shown in Table 1 can be used as a control when applied to 6.8 kg (15 lb) felt. This formulation will show severe bleeding when applied on a coal tar substrate and a somewhat lower degree of bleeding when applied on the asphalt felt substrate.
6. Preparation of Test Panels
6.1 Cut 125 by 255 mm (5 by 10 in.) pieces from a roll of coal tar or asphalt substrate. The specimens shall be cut at least 127 mm (5 in.) in from the edge. 6.2 Prepare the non-bleeding contrast surface by attaching a 25 mm (1 in.) of cellophane tape to the coal tar or asphalt substrate piece using firm pressure. The tape shall be posi- tioned so that the outside edge is at least 25 mm (1 in.) from the edge and parallel to the edge of the substrate piece.
7. Procedure
7.1 Place the test panel on a smooth flat surface (such as a glass panel), with the tape side up on the left, and hold in a flat position by weighting down the edges. 7.2 Draw the paint under test down over the specimen panel in such a manner that the entire width of the tape is covered, leaving the remainder of the film to the right of the tape in direct contact with the test panels. Apply the paint under test at a thickness to ensure complete hiding. 7.3 Keep the coated panel in a flat position until the film is set (after which the weights may be removed) and allow the coated panel to dry for 48 h at 21 to 27°C (70 to 80°F).
