Heat Vulcanization Adhesive 823 Equivalent to Chemlok 220/6125

Product Specification

Heat Vulcanization Adhesive 823 Equivalent to Chemlok 220/6125

Application

Heat Vulcanization Adhesive 823 serves as a secondary adhesive specifically intended for application over 815 primer. This adhesive system is designed to bond uncured elastomers to metals and other rigid substrates during the vulcanization process of the elastomer. It is formulated without heavy metals and consists of a blend of polymers, organic compounds, and mineral fillers dissolved or dispersed in an organic solvent system.The 815 primer enhances environmental resistance for the bonded assembly and promotes strong adhesion to the substrate.

Characteristics

1. Versatile Application: When used with 815 primer, it effectively bonds a diverse range of rubbers including natural rubber, SBR, neoprene, polyisoprene, and polybutadiene to various metals and other rigid substrates.
2. Environmentally Friendly: Formulated without the use of heavy metals.
3. Superior Performance: Provides a smooth, continuous film appearance for excellent results.

Typical Properties

Applying Heat Vulcanization Adhesive 823

Surface Preparation Guidelines:

Initial Cleaning: Ensure thorough cleaning of metal surfaces before applying primer. Remove protective oils, cutting oils, and greases using solvent degreasing or alkaline cleaning methods. Eliminate rust, scale, or oxide coatings using appropriate chemical or mechanical cleaning techniques.

Chemical Cleaning: Chemical treatments are suitable for automated metal treatment and adhesive application lines. They are preferred for metal parts sensitive to distortion from blast cleaning or where precise tolerances must be maintained. Steel commonly undergoes phosphatizing, while aluminum typically receives conversion coatings.

Mechanical Cleaning: Grit blasting is widely used for mechanical cleaning. Alternatively, machining, grinding, or wire brushing may be employed. Steel grit is recommended for blast cleaning steel, cast iron, and other ferrous metals. For stainless steel, aluminum, brass, zinc, and other nonferrous metals, use aluminum oxide, sand, or nonferrous grit.

For further detailed information on surface preparation of specific substrates, refer to our adhesive application guide. Handle clean metal surfaces with clean gloves to avoid contamination with skin oils.

For most consistent bonding results, apply the Heat Vulcanization Adhesive 823 to 815 primed stainless steel, aluminum, brass or other nonferrous substrates. Allow primer to thoroughly dry before applying Heat Vulcanization Adhesive 823. For further details on the use of 815 primer, refer to the 815 primer data sheet.

4. Mixing: Thoroughly stir Heat Vulcanization Adhesive 823 before applying adhesive over primer. Agitate sufficiently during use to keep dispersed solids uniformly suspended.

--Depending on container, use the following recommended mixing method and duration:

--1/2 pint Hand stir, paint shaker 5-10 minutes

--1-5 gallon Hand stir and air powered mixer 15-60 minutes

--55 gallon Hand crank and air motor agitator 8 hours-new drum; continuous-opened drum

5. Applying: Apply Heat Vulcanization Adhesive 823 by spray, dip, brush or roll coat methods. Heat Vulcanization Adhesive 823 is normally used full strength for brush, roll coat and dip application. For spray application, dilute adhesive with xylene or toluene to a Zahn Cup #2 viscosity of 25-28 seconds. Dilution of 25-50% is typical.

Optimal film thickness for a particular bonded part is dependent on the rubber formulation and the level of adhesion required. Regardless of application method, use the following recommended dry film thicknesses:

815: 5.1-10.5 micron (0.2-0.4 mil)

823: 12.7-25.4 micron (0.5-1.0 mil)

6. Drying/Curing: Allow applied adhesive to air-dry for 30-60 minutes at 15-32°C (60-90°F). If humidity is high, drying times may take longer. Drying time can be shortened by either preheating the metal inserts or oven drying after application. Metal parts may be preheated to a maximum of 60°C (140°F) prior to adhesive application. If dry spray or cobwebbing occurs, lower the metal preheat temperature. For coated parts, moderate drying temperatures should be used, but temperatures as high as 93°C (200°F) can be used for short periods of time. Maximum air flow at minimum temperatures will give the best results.

Dried films of Heat Vulcanization Adhesive 823 are non-tacky; therefore, coated parts can be piled into tote pans for subsequent processing. Wear clean gloves when handling cemented parts and cover the tote pans to prevent contamination by dirt, grease, oil, etc. Limit layover times to less than 30 days.

Heat Vulcanization Adhesive 823 cures during the rubber vulcanization process.

7. Cleanup–Clean liquid spills with rags. Remove dried material from surfaces with spark-proof equipment and dilution solvents.

Packing

3.5kg/drum; 18kg/drum