Bostik Offers New Material On Marine Grade Sealants

Bostik Division, Emhard Chemical Group, Middleton, Mass., is offering new free literature on its marine grade sealants—Bostik 320 Polysulfide/Sealant, Bostik 620 Silicone Sealant/Adhesive, and Bostik 920 Urethane Sealant/Adhesive.

The explanatory text of the literature, which also contains color photos of the sealants along with drawings illustrating their use, describes Bostik 320 as a one component marine grade polysulfide sealant that chemically cures to form tough, low modulus, elastomeric seals. It is said to stay flexible even in joints subjected to considerable movement and to be particularly effective for applications below the waterline where disassembly may later be necessary.

It should be considered for portholes, keel plates, keel seams, depth finders, instruments, and encapsulated nuts and bolts.

Bostik 620 is listed as a one part silicone sealant that cures to form extremely flexible seals to a wide variety of boatbuilding materials. It is specifically recommended for joints above the water line that may later need to be disassembled, and it should be considered for grip rails, lights, horns, portholes and mountings for antennas.

Bostik 920 is described as a one compound marine grade urethane sealant that is said to provide exceptional adhesion to most boatbuilding materials. It is recommended for any marine application, above or below the waterline, where a permanent seal is desired and should be considered for deck to hull assembly, hull seams, keel joints and undermoldings.

In addition to product description, the literature gives the physical properties, product characteristics, and features and uses, as well as terms and conditions of sale.

A comparative data chart in the brochure lists such information as product data, container sizes, colors, application method, extrudability, track free time, and shore hardness; a performance data chart lists the type of material each sealant is recommended for, as well as environmental resistance in water, salt water, oil, gasoline, and outdoor weathering.

For free copies of the literature on marine grade sealants from Bostik, Circle 31 on Reader Service Card

Maritime Reporter Magazine, page 39,  Mar 1985 Rhode Island

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.