META-LINK™ 361: SHOCK RESISTANT, HIGH TEMPERATURE EPOXY ADHESIVE

SHOCK RESISTANT, HIGH TEMPERATURE EPOXY ADHESIVE FOR SAMARIUM-COBALT MAGNETS FOR DIESEL INJECTOR SPRING SEATS 

INTRODUCTION:

META-LINK™ 361 is a shock-resistant epoxy adhesive system specifically designed to chemically ” weld” diverse hard-to-bond substrates to withstand the thermal and mechanical shock of high temperature corrosive environments.

META-LINK™ 361 couples superior chemical resistance to diesel fuels and hydrocarbon solvents with good thermal conductivity and high temperature adhesive strength.

META-LINK™ 361 is especially suitable for bonding a fragile pressed powder samarium-cobalt magnet to the steel spring seat of an oscillating diesel fuel injector. These magnets function as the central “sensor-link” of a newly developed operational magneto-static Hall-Effect magnetic field sensor. This unique sensor now provides a practical economical method for the precision control of the fuel , supply of a diesel engine by microprocessor.*

PRODUCT DATA:**

TYPICAL GENERAL PROPERTIES BASE ACTIVATOR MIXED
Appearance and Form Tan thick paste Beige thick liquid Lt. Tan soft paste
Specific Gravity (25°C/25°C) 1.48 1.39 1.42
Density (l bs/gal ) 12.25 11.6 11.8
Viscosity (l 03·cps, 25°C) 200 45 180
Shelf Life 6 months 6 months ——
Working Life (mixed 25°C) —— —— 4 Hours

*Full information on the installation of samarium-cobalt magnets with META-LI NK™ 361 and the installation of diesel fuel injector magnetic microprocessor sensor controls is available from the manufacturer, Wolff Control s, 1 800 Executive Road , Winter Haven, Florida 33880.

**Properties listed are typical values and are not intended for specifications.

INSTRUCTIONS FOR USE:

Surface Preparation –No special surface preparation is required. Lightly abraded steel and degrease both surfaces of steel and magnet and taking care that surfaces are free of particles of metal. Insure that no free particles remain on surface of the magnet by testing with transparent pressure sensitive tape.

Adhesive Preparation –Mix equal parts, by weight, of META-LINK™ 361 adhesive. Pre-warming is permissible up to 65°C to facilitate application by automatic dispensers.

CURING INSTRUCTIONS:

After mixed adhesive is applied, cure the assemblies for 2 hours at 120°C. A post cure of one hour at l50°C is recommended to maximize properties.

APPLICATION INSTRUCTIONS FOR MAGNETS TO INJECTOR SPRING SEATS:

Apply META-LINK™ 361 mixture in a mound to magnet or steel injector spring seat so that the material partially covers the side of the magnet when the magnet is pressed in place (see diagram). This protects the magnet and prevents crumbling or shattering of the somewhat fragile magnetics. Cure the adhesive as directed in “Curing Instructions” above.

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META-LINK™ 361 is also supplied in pre-weighed Metre-Mix™ Duo packs for easy mixing and dispensing.

TYPICAL PROPERTIES (CURED ADHESIVE)*

BOND STRENGTHS* 25°C 85°C 150°C
Tensile shear, psi at test temperature
Aluminum to Aluminum 1450 1425 1390
Aluminum to Steel (cold rolled) 1360 1340 1280
Steel to Steel 1225 1210 1150


MECHANICAL PROPERTIES**

Tensile Strength, psi -25°C 1.3 x 104
25°C 1.2 x 104
l00°C 6.0 x 103
Ultimate Elongation, % -25°C 3.8
25°C 5.0
100°C 9.0


ELECTRICAL PROPERTIES**

Dielectric Constant (60 Hz) 20°C 3.8
60°C 4.4
100°C 4.9
Dissipation Factor (60 Hz) 20°c 20°C 0.040
60°C 0.042
100°C 0.053
Volume Resistivity (60 Hz) 20°C 2.1 x 1015
60°C 9.2 x 1014
100°C 3.9 x 1014
Dielectric Strength, volts/mil 430


STORAGE REQUIREMENTS:

Store in tightly sealed containers in a dry location at or below normal room temperature. Do not store at temperatures over 37°C. Do not leave containers open. The shelf life is six months only when stored in unopened containers at 25°C.

PRODUCTION AIDS:

For cleaning uncured epoxy resins and equipment refer to Data Bulletin for Metaterge 1405 entitled, ”Uncured Epoxy Remover and Clean-up Detergent for Resins”.

For a special hand cleaner strong enough to remove epoxy compounds yet mild without abrasives to use on hands refer to Data Bulletin for Metaterge 1421 entitled, “Power Hand Cleaner”.

*Properties listed are typical values and are not intended for specifications.
**Properties listed for META-LINK™ 361 cast into specimens of 1/8″ thickness.

Fully cured META-LINK™ 361 may be dissolved with Metastrip DP-705 or Metastrip 701. Refer to Data Bulletin for Metastrip DP-705 entitled, “Powerful Epoxy Stripper for Removal of Cured Epoxy Resins” and Data Bulletin for Metastrip 701 entitled, “Powerful, Non-Corrosive Stripping Solvent for Cured Epoxy, Polyester, Polyurethane and Similar Resins”.

HANDLING PRECAUTIONS:

Prolonged or frequent skin contact with uncured META-LINK™ 361 may cause dermatitis. Good industrial hygiene practices should be observed when working with this system. In case of accidental skin contact, wash affected area with soap and water. In case of eye contact, flush eyes thoroughly with water. Contaminated clothing should not be worn until it has been thoroughly cleaned.

For more detailed information about the proper handling of epoxy resin compounds and hardeners in the workplace, the following publications are recommended:

1. Epoxy Wise is Health Wise –Publication of the U.S. Department of Health and Human Services which can be obtained through the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C.

2. Epoxies How to Handle Them Safely –Published by the Society of Plastics Industry, Inc., 355 Lexington Avenue, NY, NY 10017.

3. Epoxy Resin Systems, Data Sheet 533 –Published by the National Safety Council, 425 North Michigan Avenue, Chicago, IL 60611.

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