AASHTO M 248-91:2012 Standard Specification for Ready-Mixed White and Yellow Traffic Paints.
1.1. This specification covers alkyd resin type, ready-mixed white and yellow traffic paints for use on
bituminous and portland cement concrete pavements.
1.2. Intended use of the traffic paint.
1 .2.1. These paints may be rellectorized for night visibility by adding reflective spheres before the paint film dries or sets, using the drop-on or pressurized methods. Generally, the reflective spheres are evenly dispersed to a wet film of 0.38 mm (15 mils) at a rate of 600 to 720 kg/rn (5 to 6 lb/gal) of paint. The amount may be altered by the purchaser.
1.3. Tipes:
1.3.1. Tipe S Traffic Paint—This type is a slow drying paint that shall be used in areas where coning is acceptable for 1 h or more.
1 .3.2. Type N Traffic Paint—This type has immediate drying properties and shall be used in areas where coning of roadway is acceptable for 15 to 30 mm.
1.3.3. Tipe F TraffIc Paint—This type shall be used where faster drying time is required with a minimum of coning. With good drying conditions, this paint should dry in 3 to 6 miii if heated to 51.5 ± 2.5°C (125 ± 5°F) in the applicator.
1 .4. The values stated in SI units are to be regarded as the standard.
Note I -It is advisable to consult local air pollution regulations regarding solvents prior to selecting the type of paint to be used.
2.1. ASTM Standards:
• D 79, Standard Specification for Zinc Oxide Pigments
• D 211, Standard Specification for Chrome Yellow and Chrome Orange Pigments
• D 362, Specification for Industrial Grade Toluene (Withdrawn 1989)
• D 476. Standard Classification for Dry Pigmentary Titanium Dioxide Products
• D 600, Standard Specification for Liquid Paint Driers
• D 605, Standard Specification for Magnesium Silicate Pigment (Talc)
• D 711, Standard Test Method for No-Pick-Up Time of Traffic Paint
4.1.7. Alkyd Resin, Type N—The resin shall he supplied as a 60 mass percent solution in toluene. The resin solids shall be a medium oil soya-modified pentaetythritol resin. No rosin shall be permitted. The oil fatty acids shall be either alkali-refined soya oil or the fatty acids of soya oil having an iodine number of 115 to 130. No recovered oil, marine, or soya food fatty acid derivatives shall be used. The resin shall comply with the requirements in Table 1.
4.1.8. Alkyd Resin, Type F—The resin shall be supplied at 60 mass percent solids in VM&P Naphtha. The resin solids shall be either alkali-refined soya oil or linseed oil or a mixture of’ the two, having an iodine number of’ I 1 5 minimum. The solution must tolerate a 500 mass percent dilution with VM&P Naphtha. A solution containing 100 g of 20 MPas (20 cP) chlorinated rubber, 130 got resin solution, and 290 g of’ methyl ethyl ketone shall be clear, transparent. and show no separation after 24 h of storage at 27 ± 3°C (80 ± 5°F) in a three-quarters-full test tube. The alkyd resin, reduced to 45 percent solids with VM&P Naphtha, shall have a viscosity of D to G. The resin shall comply with the requirements in Table 1.
4.1.9. chlorinated Rubber—The rubber shall have a fixed chlorine content of 65.0 percent minimum when previously dried at 100 ± 5°C (212 ± 9°F) for 24 h. A 20 mass percent solution in toluene shall have a maximum color of 4 (Gardner) and a Brookfield viscosity of 9 to 25 MPas (9 to 25 cP).AASHTO M 248-91 pdf download.