Grade: 630

Single Coat Adhesive for bonding Nitrile (NBR) to Metals.
Outstanding Petrol, Chemical and Heat Resistance.

Introduction

Polyloc 630 is a single coat adhesive system for bonding unvulcanised Nitrile Rubber (NBR) compounds to metals during the vulcanisation of the elastomer. This adhesive system produces bonds that are outstandingly resistant to all kinds of environmental conditions and corrosion, and capable of withstanding extreme static and dynamic stresses.

Polyloc 630 is used in the manufacture of various industrial items used in the automobile, railway and machine industry like Oil Seals, Vibration Isolators, and other rubber to metal bonded products.

Properties of Polyloc 630

Composition	Mixture of phenolic resin and dispersed fillers in organic solvents
Color	Brown
Solid Contents	28 ~ 32%
Diluents	MEK, MIBK
Specific Gravity	0.90 ~ 0.97
Viscosity (20oC)	10 ~ 30 cps
Shelf Life	6 months
Flash Point	-1 dC

Preparation of Metal Surface

This is the most critical step for any rubber to metal bonding process. The metal surface should be cleaned of all contaminants such as oil, rust, dirt, etc. by suitable mechanical and/or chemical methods.

Grit/sand blasting, and wire cloth abrading are commonly established mechanical methods of metal preparation for most metals, and give excellent results. Chemical treatment of the metal surface by phosphatising results in a highly corrosion resistant and bondable surface. The general steps are: Water rinse - Acid pickle - Water rinse - Phosphatise - Water rinse - Chromate rinse.

Application of the Adhesive

Polyloc 630 has to be stirred thoroughly for 15 minutes before use. The adhesive may be applied by dip, spray or brush. The application of a thin and uniform coating of the bonding agent, free from excessive runs, tears or fatty edges is an essential condition for optimum bonding results.

Dilution of the adhesive should be done just before application. It takes 30 minutes for Polyloc 630 to dry at room temperature. For faster drying, drying ovens can be used. The coated part should be used within 72 hours of adhesive application. They should be given another coat of the adhesive if they are not used within this period of time.

Vulcanisation / Bonding

Polyloc Adhesives allow good bonds to be obtained by various curing methods. All normal vulcanising methods including press curing, autoclave, and continuous vulcanisation techniques can be used to get excellent bond results.

Best results are obtained at curing temperatures between 130oC and 200oC. With short vulcanising cycles like injection molding processes, higher temperatures may be used.

Basic care should be taken in removing the hot bonded parts from the molds so as to prevent any damage to the bond. The bonds will gain their full strength after cooling and maturing for 10-12 hours.

Cautionary Information

This product is meant for industrial use only. It contains highly volatile solvents; keep product away from heat, direct sunlight and open flame. Vapors may be harmful and prolonged breathing should be avoided. May be harmful or fatal if swallowed