TT-P-28H
TABLE III. Hazardous metal content - Continued.
Metal and/or its compound in each coating dry film |
Soluble metal, maximum, mg/L |
Total metals content, maximum, %WT |
Thallium |
7 |
0.007 |
Tungsten |
100 |
0.100 |
Vanadium |
24 |
0.01 |
Zinc |
250 |
0.25 |
NOTE:
1/ Total cobalt content may exceed 0.005 %WT (up to 0.2 %WT) only if a cobalt drier is used to effect proper drying. Regardless of whether a cobalt drier is used, soluble cobalt content may not exceed Table III requirements.
3.4 Qualitative requirements. The following qualitative requirements apply equally to Type I and Type II products unless specifically modified for Type I liquid or Type II powder coatings.
3.4.1 Condition in container (type I). The unopened can shall show no evidence of gas build-up, such as bulging of can. When tested in accordance with 4.5.7, a freshly opened full container of the paint shall be free from grit, seeds, skins, lumps, abnormal thickening or livering and shall show no more pigment settling or caking than can be readily reincorporated to a smooth uniform state.
3.4.2 Storage stability.
3.4.2.1 Partially full container (type I). When tested in accordance with 4.5.8.1, a three-quarter filled, closed 8- ounce glass jar of the paint shall show no skinning. At the end of the 7-day heat test, the treated sample shall be cooled to room temperature and it shall show no pressure build-up; also, no livering, curdling, hardcaking or gummed sediment shall be observed. The paint shall mix readily to a smooth uniform state, and any skin formed shall be continuous and easily removed. The aged paint after the 7-day heat test shall be suitable for the purpose intended.
3.4.2.2 Full container (type I). When tested in accordance with 4.5.8.2, a full quart can of the paint shall show no "gas" pressure in the can, no skinning, livering, curdling, hard dry caking, or tough gummy sediment. The paint shall mix readily to a smooth uniform state and shall be suitable for the purpose intended.
3.4.2.3 Type II storage stability. Type II powder coatings shall meet the requirements of this specification for one year from the date of manufacture when stored in the original unopened container when tested in accordance with
4.5.8.3.
3.4.3 Brushing properties (type I only). When tested in accordance with 4.5.9, the paint shall brush easily with good flow and leveling properties and shall dry to a smooth uniform film free from seeds, runs, sags, or streaks.
3.4.4 Spraying properties (type I). When tested in accordance with 4.5.10, the paint shall spray satisfactorily in all respects and shall show no running, sagging, or streaking. The dried film shall show no dusting or mottling and shall present a smooth uniform finish free from seeds.
3.4.4.1 Spraying properties (type II). When applied by established powder coating application methods (see
4.5.10.1), the film produced shall melt, fuse and cure to a film thickness of 2 to 4 mils (nominal 3 mils). The cured film shall be uniform, smooth, even, free of runs, sags, and streaks and meet the applicable requirements of this specification.
3.4.5 Heat resistance testing. Type I and Type II heat resistance test panel preparation and testing shall be in accordance with 4.5.11.
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