Coatings, ASTM Procedures

ASTM D 822 describes a standard procedure for operating light- and water-exposure apparatus (carbon-arc type) for testing coatings. ASTM G53 and DIN 53384 describe similar standard procedures for the light exposure or light and water exposure (fluorescent UV type) of nonmetallic materials [9.54]. 

In ASTM procedure," a glass panel is coated with a wet film of lacquer having a thickness of 63 pm (diy thickness minimum of 25 pm), dried according to lacquer specifi-... 

ASTM Procedures - The following is a list of recognized ASTM Procedures used primarily for the evaluation of coatings formulations and determination of coating characteristics. 

Test Procedures. Coatings were tested by the following procedures. For crosshatch adhesion, ASTM-D3359, a special scribe was employed which had 11 sharp points spaced approximately 1 mm apart. The film was scored twice with this tool so that scratches were perpendicular. Special tape was then placed firmly over the scored area and pulled off. The number of squares of film coating remaining were counted, and this provided a numerical basis for measuring surface adhesion. No squares are removed for a satisfactory coating. 

Biocide release rate methods were first developed for TBT-containing compounds in an effort to establish limits on their release from AF into marine bodies (Haslbeck and Holm, 2005). The core idea of this kind of methods is to develop standardised procedures which can tell, after as short an experimental time as possible, whether an AF coating will be leaching environmentally acceptable amounts of biocide into sea water. Two such methods are available to measure the release rate of copper, namely the ASTM D6442 and ISO 15181 -... 

Table 1 Comparison between the new, unified ASTM and ISO standard test methods for copper release rates of AF coating systems in sea water (to be implemented during 2005 Arias, personal communication). The description of the original procedures (ASTM D6442-99 and ISO/DIS 15181-1,2) can be found in Arias (1999) and Haslbeck and Holm (2005).

Maple Block Screening Method. A series of experimental procedures were performed on bonding maple block wood (Cook, P. M., Eastman Kodak at Kingsport, TN, personal communications, 1987). The procedure adopted was the ASTM D 905 standard, modified as follows Sugar maple (Acer saccharum) wood, 76 by 25 by 5.7 mm in size (3 inches long, 1 inch wide, and 0.25 inch thick), with 6% moisture content was planed to obtain fresh surfaces for bonding. The desired amount of resin (with no mix additives) was weighed (58.6 g/m2, 12 lb/1000 ft2, resin solids basis) and applied to one block surface and then a second clean block was overlapped so that 25 square mm (1 square inch) surface area common to each block was coated. The resin coated blocks were placed directly in the hot press (no clamp time). The blocks were hot pressed at 177°C (350°F) for 4 to 6 minutes at 3.44 MPa (500 psi). All bonded blocks were allowed to... 

The Gehman test is also standardised in BS903 Part A1318 and ASTM D105319. The British Standard is identical to the international method but the ASTM has a rather different layout as it covers coated fabrics as well as rubbers and a single point procedure is added for routine inspection. It only specifies a step temperature change procedure. 

ASTM B380, Std Method of Corrosion Testing of Decorative TLlectrodeposited Coatings bj the Corrodkote Procedure, American Society for Testing and Materials, Philadelphia, Pa., 1990. 

Mixing time for a particular mix can be established by trial and error, and the procedure described in ASTM D 2489 (2008) or AASHTO T 195 (2011) may be used it is based on estimating the percentage of coated aggregates, which should always be 100%. 

---