Secondary BA 223 Rubber To Metal Bonding Adhesive

Rubber to Metal Adhesive BA-223
(Equivalent to Chemlok 220, Chemosil 225, Rohm Haas 520/526)

Description

BA-223 adhesive is a secondary adhesive designed for use over BA-213 primer. It is more competitive than Chemlok 220, Chemosil 225, Rohm Haas 520/526.

This adhesive system will bond uncured elastomers to metals and other rigid substrates during vulcanization of the elastomer. It is formulated without heavy metals and composed of a mixture of polymers, organic compounds and mineral fillers dissolved or dispersed in an organic solvent system.

BA-213 primer helps to ensure environmental resistance of the bonded assembly and adhesion to the substrate.

Features And Benefits

Wide Application Range–when used in combination with BA-213 primer, it bonds a wide variety of rubbers such as natural rubber, SBR, neoprene, polyisoprene and polybutadiene to various metals and other rigid substrates.

Environmental Friendly–formulated without heavy metals.

Excellent Effect–provides a continuous film appearance.

Typical Properties:

• Color: BlackLiquid
• Viscosity@25℃, 77 ℉(Brookfield LVT Spindle 2, 30 rpm ): 70-300 cps
• Density:975.0-1000.0kg/m3
• Solid contentby weight: 23-27%
• Flash Point(seta): 25-28℃
• Solvent: Xylene
• Shelf life: 12 months in unopened containers (21-27°C (70-80°F))

Application And Handling

• Surface Preparation: Thoroughly clean metal surfaces prior to primer application. Remove protective oils, cutting oils and greases by solvent degreasing or alkaline cleaning. Remove rust, scale or oxide coatings by suitable chemical or mechanical cleaning methods.
• Chemical Cleaning: Chemical treatments are readily adapted to automated metal treatment and adhesive application lines. Chemical treatments are also used on metal parts that would be distorted by blast cleaning or where tight tolerances must be maintained. Phosphatizing is a commonly used chemical treatment for steel, while conversion coatings are commonly used for aluminum.
• Mechanical Cleaning: Grit blasting is the most widely used method of mechanical cleaning. However machining, grinding or wire brushing canalso be used. Use steel grit to blast clean steel, cast iron and other ferrous metals. Use aluminum oxide, sand or other nonferrous grit to blast clean stainless steel, aluminum, brass, zinc and other nonferrous metals.
• 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 BA-223 adhesive to BA-213 primed stainless steel, aluminum, brass or other nonferrous substrates. Allow primer to thoroughly dry before applying BA-223 adhesive. For further details on the use of BA-213 primer, refer to the BA-213 primer data sheet.
• Mixing: Thoroughly stir BA-223 adhesive 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

• Applying: Apply BA-223 adhesive by spray, dip, brush or roll coat methods. BA-223 adhesive 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:

BA-213: 5.1-10.5 micron (0.2-0.4 mil)

BA-223: 12.7-25.4 micron (0.5-1.0 mil)

• 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 BA-223 adhesive are non-tacky; therefore, coated parts can be piled intotote 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.
• BA-223 adhesive cures during the rubber vulcanization process.
• Cleanup–Clean liquid spills with rags. Remove dried material from surfaces with spark-proof equipment and dilution solvents.