Chemlok 603 Vulcanized MH-NBR Bonding Treatment

Bonding applications

Chemlok 603 is a solvent-based, one-coat surface treatment for the following material combinations:

• Vulcanized medium-high-acrylonitrile nitrile rubber (MH-NBR) to vulcanized MH-NBR.
• Vulcanized MH-NBR to metal.
• Aluminum to nylon resin.

It supports room-temperature bonding, with heat available to accelerate curing. Most applications require a single coat. Confirm the joining and curing conditions for the actual materials.

Application and drying

Clean metal surfaces to remove oils, grease, rust and oxide layers. Stir thoroughly before use and maintain agitation to keep solids suspended. If dilution is necessary, use methyl ethyl ketone (MEK) or methyl isobutyl ketone (MIBK); dilution accelerates settling.

Apply by brush, dip or spray to a dry-film thickness of 6–20 μm. Allow at least 30 minutes at room temperature for drying, ensuring that all solvent has evaporated. Hot-air ovens or tunnels can shorten drying time. This drying period is not a specified full-cure time.

Typical properties

Property	Typical value
Appearance	Black liquid
Viscosity at 25°C	30–50 cps, Brookfield LVT, spindle 2, 30 rpm
Density	0.85–0.95 g/cm³
Solids by weight	18.5–21.5%
Solvent system	MEK, MIBK, ethyl acetate

Typical values are for reference, not product specifications. Verify the rubber formulation, substrate and bonding process for the intended component.

Supply and technical enquiries

Hongtu Chemical supplies Chemlok 603 as an authorized distributor. Contact our team for product information, quotations or advice on the bonding process.