PU to Metal Bonding Adhesive 840

(Equivalent to Chemlok 218)

Rubber to metal bonding adhesive 840 is a one-coat surface treatment used to affix castable and millable polyurethane elastomers to metals and other rigid substrates. It is composed of a mixture of polymers and resins dissolved in an organic solvent system.

Technical Specifications

Item	Key Characteristics
Appearance	Clear to Slightly Hazy Amber Liquid
Viscosity @25℃, 77 ℉(Brookfield LVT Spindle 2, 30 rpm )	400-1000 cps
Density	950.0 – 990.0kg/m³
Solids Content by Weight	18-21%
Flash Point (Seta)	2-15°C
Solvent	Toluene, Trichloroethylene, Isopropanol, Ethanol

Applicable Range

Used as a cover coat adhesive and in combination with a primer adhesive, suitable for the following types of rubber: Natural rubber (NR), Natural & butadiene rubber (NR+BR), Polyisoprene rubber (IR), Butadiene rubber (BR), Chloroprene rubber (CR), Styrene butadiene rubber (SBR), Nitrile butadiene rubber (NBR), Butyl rubber (IIR), EPDM, etc.

Primary Applications

Flexible Foams: Furniture cushioning, bedding, and automotive seating.
Rigid Foams: Energy-efficient insulation boards and cold chain panels.
Elastomers & Coatings: High-durability coatings, synthetic leather, and industrial seals.

Shelf Life/Storage

Shelf life is 12 months from date of shipment when stored at ＜ 37℃ in original, unopened container. Do not store or use near heat, sparks or open flame.

Precautions

This product is volatile, please close the container after use.
Solvent steam is harmful, pay attention to fire prevention in the workplace, pay attention to low ventilation, prevent long-term inhalation or long-term skin contact.
Please refer to SDS for more safety information.

Frequently Asked Questions (FAQ)

Q1: What is Polyton 840 used for?
A: It is a one-coat bonding agent that bonds castable and millable polyurethane elastomers to metals and other rigid substrates.

Q2: Does 840 require a primer?
A: No. It is a one-coat system that needs no primer, saving labor and cost.

Q3: Is 840 equivalent to Chemlok 218?
A: Yes. It is equivalent to Chemlok 218 and can be used as a direct replacement in the same process.

Q4: What is the shelf life and storage?
A: One year from shipment when stored at 21-27°C in original, unopened containers.