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MT-6000WB Waterbased MaskantDESCRIPTION: MT-6000WB is a hand strippable waterbased coating which provides protection to steel, aluminum and other metals as well as plastics during plating cycles and chemical milling operations. This product contains no VOC’s and is considered nonhazardous. MT-6000WB can be applied by dipping, spraying or brushing. This maskant exhibits very good adhesion to highly polished surfaces.
PHYSICAL PROPERTIES:Solids Content: 50-55% by weightViscosity: 3,200 – 4,000 cps (#4 Spindle at 20 RPM) Color: Light green Coverage: 230 sq.ft./gal. 6-7 mil wet coat Weight per Gallon: Approximately 9 pounds pH: 8.8-9.0 Storage: Store above 40 F (4C) and below 100 F (38C) Keep out of direct sunlight. Keep containers closed when not in use.
APPLICATION PROCEDURESBRUSHING: The part must be physically clean and dry prior to applying the maskant. At a minimum, a wipe with a clean solvent is needed to remove greases, oils and other contaminants. Always wear lint free gloves when handling clean parts. Use a foam brush or other good quality brush to apply the maskant to the surface of the metal or plastic part. Do not brush the maskant as you would with a typical latex paint. Flow the maskant onto the surface and level it as much as possible with the brush. Level out the maskant to the line where the plating is not desired. At a minimum, each coat should be 7-8 mils wet to achieve a 6 mil dry film thickness. Allow each coat to dry thoroughly before applying additional coats. Dry time will vary depending upon relative humidity and temperature. Parts can be placed in a warm oven, 130 F (54 C) for forty-five minutes to one hour to accelerate drying. Two to three coats are generally sufficient for most plating cycles or chemical milling. Always test the metal surface of the metal for adhesion with a small amount of maskant prior to applying full coats. NOTE: THE FIRST COAT OF MASKANT MUST BE FULLY DRIED BEFORE APPLYING ADDITIONAL COATS. NOTE: MAKE SURE THE MASKANT IS FULLY DRIED BEFORE PLACING PARTS INTO ANY SOLUTION. AN OVERNIGHT DRY IS PREFERABLE.
DIPPING: As with brushing, make sure the part is physically clean prior to immersing into the maskant. Slowly immerse the part into the maskant and allow maskant to come to the line where plating is not desired. Allow the part to drip as much as possible, usually about 10 minutes, then place in warm area with good air circulation or into a warm oven with good air circulation. The temperature of the oven should not exceed 130 F or 54 C. Depending upon the thickness of the initial wet coating, the coating should be fully cured in about 45 minutes in a warm oven. WB-6000WB should be fully cured in about 90 minutes with air drying depending upon air circulation and relative humidity. Apply the second coat in the same manner making certain that the demarcation line has sufficient thickness so the plating solution will not cause lifting during processing. If the entire part is to be dipped, rotate the part 180 degrees for the second coat. If drying in an oven, allow the parts to completely cool before applying additional coats. Parts should be dipped at a rate of 1-2 feet per minute. Two dip applications are normally required to build sufficient thickness. At a minimum, 12-16 mils dry film will be required for most metal processing operations. Edges of parts should be inspected to make sure sufficient film thickness has been built up.
SPRAYING: A Graco 30:1 Bulldog with heavy duty internal components should be used. The following Graco components should be used: Model 167-0250 60 mesh filter screen; Model 220-955 “Contractor” Series airless spray gun with Model 218-133 spray gun filter; FFR-412 green spray tip with black washer or a FFR-310 tip if smaller parts are to be sprayed; Model 210-500 in line spacing filter. Always check with spray gun manufacturers to request their recommendations as to the gun to be used. A recommended gun along with components does not imply other alternatives that would work as well or better.
SCRIBING LINES: Even though MT-6000WB exhibits very good adhesion to metal surfaces, cutting a line will break the adhesion along the cut edge. Use a very sharp knife to cut all edges and avoid lifting the maskant as much as possible. Press the edges of the maskant down along the cut edges and use a line sealer to seal the cut edges allowing some overlap of the cut edges. Use MT-1024 for sealing the cut edges. Apply a bead along the cut edges and allow the line sealer to dry thoroughly between coats. As a general rule, two coats of line sealer should be sufficient for most applications. Silicone sealant can be applied to parts that will be chemical milled. Always visually inspect the parts prior to placing into the metal finishing process. It may be necessary to use a spark tester to check for metal areas that may exposed. MT-1024 can be used to repair these areas or because of the fast drying nature of MT-6000WB, it may also be used to repair these areas. NOTE: MT-6000WB TENDS TO DRY SLIGHTLY TACKY SO AVOID PLACING THE DRIED FILM AGAINST ITSELF, PAPER OR OTHER SURFACES THAT COULD CAUSE STICKING.
REMOVAL: Given sufficient thickness, MT-6000WB should peel readily from the part. After the part has been processed in any plating or other cycle and especially in chemical milling, make sure the coating has completely dried before attempting to peel it from the part. If the coating is a bit hard to peel, a short soak in very warm water will aid in the removal process.
STORAGE AND HANDLING: MT-6000WB should be stored below 100 F (38 C) and above 40 F (4 C). Always store MT-6000WB away from direct sunlight and away from heat sources. While not flammable, heat sources may cause the maskant to become viscous and gel inside the container. KEEP CONTAINERS CLOSED WHEN NOT IN USE TO AVOID CONTAMINATION AND SKINNING OF THE SURFACE. A slight stir may be required before using if MT-6000WB has been sitting for more than two days. Stir only slightly to make the mixture homogeneous and avoid entrapping air. A propeller type mixer can be used for stirring large amounts and should be placed near the bottom of the container. Increase the speed of the blade until the surface begins to move and the maskant is a creamy consistency. Five minutes should be more than adequate. Thin with deionized water to the desired consistency for your application. For extended storage, mist deionized water over the maskant and place a sheet of plastic over the maskant. This will help prevent skinning of the surface. Seal the container and place in a cool area. KEEP FROM FREEZING KEEP OUT OF DIRECT SUNLIGHT
TERMS, CONDITIONS AND WARRANTY
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