C.G.Edwards & Co.Inc.
272 Dorchester Ave, P.O.Box 358
Boston, MA 02127
Phone: (617)268-4111-4112 * Fax:617-268-8845
PPG Dimetcote 21-5 quick reference guide
|Mixing ratio||as supplied, only mix full kits|
|Curing mechanism||Water evaporation and chemical reaction between components|
|1 mil (25 microns)||1010||24.8|
|3 mil (75 microns)||336||8.3|
|Air||40 to 120||4 to 49|
|Surface||40 to 130||4 to 54|
|Relative humidity during application and initial drying|
|Maximum||85% at 70°F|
|Surface temperatures must be at least 5°F (3°C) above dew point to prevent condensation.|
|Thinner||do not thin|
|Equipment Cleaner||Fresh Water|
|Application Procedure||1.||Flush all equipment with fresh water before use.||2.||Stir liquid with a power mixer. Dimetcote 21-5 standard liquid is clear.
The light gray liquid is cloudy when stirred (white pigment).
|3.||Discard desiccant bag from powder and gradually stir powder into liquid. Continue stirring until powder is well dispersed and mixture free of lumps. Do not mix more material than will be used within 8 hours at 70°F. Do not reverse order nor vary proportions.
|4.||Do not thin for any reason.||5.||Strain mixture through 30 mesh screen to prevent possible clogging of equipment.||6.||Continue slow stirring during application to maintain material uniformity.||7.||Apply a wet coat in even parallel passes, overlap each pass 50 percent to avoid pinholes, holidays or bare areas.||8.||Insure proper thickness on welds, cutouts, sharp edges, rivets, bolts and corners as cracking may occur with excessive thickness.||9.||Keep pressure pot at approximately same elevation as spray gun for proper material delivery to gun.||10.||When dry through, check film thickness with a non destructive dry film thickness gauge. Recoat when dry to handle if greater thickness is required. Normal recommended thickness is 3 mils (75 microns). Allowable range is 2 to 12 mils (50 to 300 microns).|
|11.||Touch up random pinholes, holidays, small damaged or bare areas by brush when film is dry to handle. Larger areas should be sprayed.||12.||Ventilate with clean air during the application and curing following final coat. Ventilating air temperature and relative humidity between coats must be such that condensation will not form on the surface between coats. The surface must be free of moisture when the next coat is applied.||Caution - In confined areas or under stagnant air conditions, glazing of the Dimetcote 21-5 surface may occur. Lightly blast to roughen the surface before top coating.||13.||Clean equipment immediately after use with fresh water.|
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