Chemlok 238(NW) Non-Polar Rubber Bonding Covercoat
Covercoat adhesive for butyl, EPDM and other elastomers, used in rubber-to-rubber bonding or over Chemlok 205-primed rigid substrates.
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Product overview
Chemlok 238(NW) is a solvent-based covercoat adhesive for bonding non-polar elastomers to one another or to metals and other rigid substrates primed with Chemlok 205.
Elastomers and bonding arrangements
Applications include butyl and EPDM compounds. The elastomer range also includes NR, IR, SBR, BR, CR, NBR and CSM. It can bond uncured rubber to cured rubber and cured elastomers to one another, including similar or different compositions.
When a primer is used, allow it to dry thoroughly before applying Chemlok 238(NW).
Mixing and coating
Clean and prepare the substrate to remove oil, grease, rust and oxide layers. Mix the adhesive to a uniform consistency. If dilution is required, xylene or toluene can be used; dilution increases settling, so agitation remains important.
Apply a uniform film by brush, dip or spray. The general dry-film thickness is 10.2–25.4 μm. For bonding cured rubber, 25.4–38.1 μm is normally used.
Typical properties
| Property | Typical value |
|---|---|
| Appearance | Black liquid |
| Viscosity at 25°C | 150–800 cps, Brookfield LVT, spindle 2, 30 rpm |
| Density | 881.52–928.5 kg/m³ |
| Solids by weight | 12–15% |
Typical values are for reference, not product specifications.
Supply and technical enquiries
Hongtu Chemical supplies Chemlok 238(NW) as an authorized distributor. Contact our team to discuss the materials, process and technical documents for your application.
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