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HM-NA790
Howell
NA790 occupies the high grade end of the general purpose neutral curing silicone sealants for home decoration: one-component, and pairing good weather resistance with low odor, fast curing, small curing shrinkage, excellent elasticity, an anti-mildew function and great adhesion to varied substrates.
small curing shrinkage；
low odor；
excellent elasticity；
Before sealing, prepare the surface. Oil, dust, damaged areas and the loose natural oxide film from production and transportation are taken off so the substrate is coarsened into a surface profile that takes the embedding mechanism, with improved surface chemical properties and improved durability against stress and environmental factors. Isopropanol, methyl ethyl ketone and xylene go on with a white, clean, soft, non-dehairing cotton cloth, the standard solvents.
Apply them with the double cloth technique: one pass in a single direction with the soaked cloth, then a second dry clean cloth immediately, before the solvent volatilizes. The infiltrating cloth is not put into the container for infiltration, or the clean solvent is spoiled and cleaning effectiveness falls off. Complete cleaning of only the section being bonded and sealed within each 1 hour period, so the cleaned surface is not exposed to air for too long.
Tape the area beside the interface so the sealing work line stays perfect and neat. Cut open the hose mouth, mount the needle-nosed tube, cutting it to a 45° angle that matches the caulking size, then take up the sealant gun and follow the gap at the same angle so the rubber sits tight against the substrate surface; a seam wider than 15 mm needs several applications. Finish the bead with a knife, clear the excess rubber, remove the tape and wipe marks off with a damp cloth.
Advice on padding: a polyolefin, or filler rods of the open-type polyurethane or closed-cell polyethylene foam kind, keeps the sealant off three sides.
Skin forming takes 10 minutes (tested at 23 °C | 50 % r.h) and curing advances 3 mm/day; these figures are indicative and are not to be used in preparing specifications.
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