Technical Data Sheet

Magna-Tac M777 A/B

Non sag epoxy adhesive

 

 

 

 

Viscosity (cps)

at 77F

Color

Base

Wgt/Gal

Solids

Diluant

Shelf Life

Part A

Part B

920,00

300,000

Red

Yellow

Modified epoxy

9 lbs.

8.6 lbs.

100 %

100%

Do not dilute

1 year

1 year

 

 

Magna-Tac M777 is a thixotropic "non-sag", high strength, 100% reactive, room temperature curing formulated epoxy adhesive for:

 

Fully cured bonds attain tensile shear strengths in the neighborhood of 3,000 psi when tested at room temperature using MMM-A-132 procedure. Fully curedbonds exhibit minimal shrinkage, are electrical insulators and provide excellent resistance to weather, galvanic action and most chemical, acids and alkalis.

 

Characteristics

 When Mixed, Magna-Tac M777 is soft and buttery, making it extremely easy to spread smoothly and evenly. Once it is applied it maintains its form and does not flow during the cure cycle. It is excellent for "poor fit" and similar void-filling applications as well as where dripping or running of adhesive must be controlled.

 

 

Mixing Ratio (by weight)

Properties

Pot Life

@ 77 F

Average Tensile Strength

Part A

Part B

100 PARTS

100 PARTS

For best balance of properties. 45 minutes

( 1 qt)

2200 psi

 

Surface Preparation

 All bonding surfaces must be thoroughly cleaned, degreased and dried. For plastic surfaces, remove mold release if any.

 Preparation of adhesive

 

Always stir each part thoroughly first. Proportion accurately and mix slowly to avoid entrapping air.

Magna-Tac M777 Part A is colored red; Part B is colored Amber. Mix equal amounts (by volume) and stir until the color of the mixture is uniform.

Note: Pot life can be lengthened substantially if shallow mixing vessels are used or smaller batches are mixed. Cover mixed material to prevent water absorption.

Mixed adhesive may be applied with paint roller, brush or conventional spray equipment, etc. Apply enough mixed adhesive to leave about 4-6 mils in the final glue line. This may be accomplished by coating 4-6 mils on one surface only or by coating 2-3 mils on each surface.

If one surface is porous, more adhesive must be applied to fill the voids and yet produce a final glue line thickness of 4-6 mils.

 

  Cure Time

 

Room Temperature

At room temperature, assemblies can be handled in approximately 8-14 hours. Magna-Tac M777 develops 85% of its maximum strength in 24-48 hours.

NOTE: The bond continues to advance in strength for approximately one week.

 

 

Elevated Temperature Cure Schedule

Temperature

Cure Time

150 F

120 minutes

200 F

45 minutes

250 F

30 minutes

300 F

10 minutes

 

Bonds will continue to improve in strength at room temperature until optimum is reached, usually within 3-4 days.

 

Properties

 

Hardness Shore D 76 .02

Volume Resistivity @ 25C 3C Min. 100 x 1014 ohm-cm

Dielectric Constant @ 105 cps 2.98 .1

Shrinkage Linear, percent 0.7 % Max.

Typical lap shear values obtained when Magna-Tac 777 is used to bond 0.064" etched 2024T3 aluminum alloy to itself in a 1/2 overlap are as follows:

 

Test Temperature

Tensile Shear, psi

-67 F

2000

77F

2200

120F

1200

180F

400

200F

200

 

 

Beacon Chemical Company

For Ordering & Technical Assistance

Tel: 914-699-3400

Fax: 914-699-2783

e-mail   davidmesh@cs.com

 

 

The information given and the recommendations made herein are based on our research and believed to be accurate but no guaranty of their accurate is made. The products discussed herein are sold without any warranty as to merchantability or fitness for a particular purpose or any other warranty, express or implied

 

CLICK HERE TO RETURN TO BEACON EPOXIES

CLICK HERE TO RETURN TO MAIN WEB SITE .

BEACON ADHESIVES, Inc., 125 MacQuesten Parkway South, Mount Vernon, NY 10550, Tel: (914) 699-3405
E-mail: davidmesh@cs.com