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NA500: low odor, non-corrosive neutral curing sealant for home decoration caulking and sealing
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HM-NA500
Howell
3506100010
NA500 handles general purpose neutral silicone sealing for home decoration. One-component and neutrally curing, it carries no irritating odor and corrodes neither metal, coated glass, mirror glass, concrete, marble nor granite, so the acid sealant drawbacks of smell and corrosion simply do not apply.
Neutral curing,
Fast curing
Good adhesion
High density
Sealant grade: 20HM
Begin with a clean substrate: the oil, dust and surface damage picked up in transit from production, and the loose natural oxide film, all have to come off, which roughens the surface so the mechanism can bed into it and also raises surface chemistry together with how well the bond resists the stress and environmental factors it meets. Isopropanol, methyl ethyl ketone or xylene, carried on a lint-free white cotton cloth that is clean and soft, are the usual solvents.
Work the double cloth method - one directional pass with the wetted cloth, then the second dry clean cloth lifts the solvent immediately, before it volatilizes. The soaked rag stays out of the soaking container, otherwise the clean solvent is contaminated and cleaning suffers. Clean only the bonding and sealing zone that will be worked inside the next 1 hour, and do not leave the cleaned surface open to the air for long.
Sealing opens with plastic tape laid beside the interface, so the working line stays straight and clean. Open the hose mouth, seat the pointed nozzle and cut it to a 45° angle matching the caulking size. The sealant gun then runs down the gap at that angle, pressing the rubber against the substrate surface, and a seam wider than 15 mm gets several passes. Finally knife the surface flat, lift the surplus rubber, pull the tape and wipe marks with a damp cloth.
Recommended padding: filler rods made of open-type polyurethane, of closed-cell polyethylene foam or of a polyolefin, which keep the sealant away from three-sided adhesion.
Curing data belong to 23 °C | 50 % r.h: skin forming 10 minutes, a non-sag consistency and 3 mm/day of cure, offered as a guide and not as a specification basis.
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