Master Bond Polymer System EP37-3FLFAO is a two component system for high performance potting, bonding, sealing and coating formulated to cure at room temperature or more rapidly at elevated temperatures with a convenient one-to-one (1:1) mix ratio by weight or volume. It has an unusual blend of properties including high thermal conductivity, excellent electrical insulation properties, good physical strength properties and a high degree of flexibility. EP37-3FLFAO has low viscosity with excellent flow characteristics making it ideal as a thermally conductive potting epoxy. EP37-3FLFAO is also an excellent adhesive/sealant forming tough bonds that are resistant to shock, impact and thermal cycling and chemicals including water, oil and most organic solvents, over the wide temperature range of 4K to 250°F . Parts A and B are off white in color. Master Bond EP37-3FLFAO is widely used in the electronic, electrical, computer, metalworking, appliance, automotive and chemical industries where electrical insulation and heat transfer are required. The uniqueness of EP37-3FLFAO lies in the fact that this thermally conductive system retains a high level of flexibility while having the desirable physical characteristics inherent in epoxies. EP37-3FLFAO has been certified by NASA as a low outgassing epoxy.

产品优点 ：

•  Convenient mixing: easy-to-use non critical 1:1 mix ratio by weight or volume.

•  Exceptionally long working life.

•  Cures readily accelerated by heat.

•  High thermal conductivity with exceptional electrical insulation properties.

•  High bond strength to a wide variety of substrates; excellent adhesive properties.

•  Low viscosity with excellent flowability; ideal for potting and casting.

•  Resists severe thermal and mechanical shocks.

•  Good overall physical strength properties and chemical resistance.

产品属性 :

•  Mixing ratio, by weight or volume, part A to B ........................................................................... 1/1

•  Viscosity, mixed compound, 75°F , cps ..................................................................... 18,000-22,000

Working life after mixing, 75°F 200 grams, minutes ........................................................... 75-90min

•  Cure schedule 75°F ....................................................................................................... 4-5 days
200°F ................................................................................................................... 3-5 hours

•  Bond strength, shear, aluminum/aluminum

Room temperature cure, 75°F , psi ........................................................................... >1,500

•  T-peel, aluminum to aluminum, 75°F , pli ................................................................................... >15

•  Thermal conductivity, 75°F , BTU-in/ft 2 -hr-°F ............................................................................ 9-10

•  Coefficient of thermal expansion, in/in x 10 -6 /°C ...................................................................... 60-65

•  Volume resistivity, ohm-cm 77°F ....................................................................................... 1 x 10 14

•  Dielectric constant, 77°F 60Hz ............................................................................................... 6.6

1 KHz .......................................................................................................................... 6.4

•  Dielectric strength, 77°F , volts/mil (1/ 8” thick test specimen) ...................................................... 400

•  Tensile strength, 77°F , psi .................................................................................................... 3,000

•  Hardness, Shore D ................................................................................................................. 45

•  Service temperature range, °F ..................................................................................... 4°K -275°F

•  Shelf life at 75°F , in unopened containers ....................................................................... 6 months

•  Parts A and B available in pint, quart, gallon and 5 gallon containers.

Preparation of Adhesive and Bonding Surfaces

Master Bond Polymer System EP37-3FLFAO is prepared for use by thoroughly mixing part A with part B in a one-to-one mix ratio by weight or volume. Mixing should be done slowly to avoid entrapping air. It can be substantially lengthened by using shallower mixing vessels or mixing smaller size batches. All bonding surfaces should be carefully cleaned, degreased and dried to obtain maximum bond strength. When bonding to metal surfaces, chemical etching should be employed when the bonded joints are to exhibit optimal environmental durability. Non-porous surfaces should be roughened with sandpaper or emery paper for hard materials.

Adhesive Application and Assembly

Master Bond Polymer System EP37-3FLFAO can be conveniently applied with a spatula, knife, trowel, brush. paint roller, etc. Enough mixed adhesive should be applied to obtain a final adhesive bond line thickness of 4-6 mils thick or by coating the two surfaces, each with a 2-3 mil thick layer of adhesive. Porous surfaces may require somewhat more adhesive to fill the voids than non-porous ones. Thicker glue lines do not increase the strength of a joint but do not necessarily give lower results as the EP37-3FLFAO system does not contain any volatiles. The parts to be bonded should then be pressed together with just enough pressure to maintain intimate contact during cure. In casting applications, it may be necessary to vacuum degas in order to remove the relatively few air bubbles that may have been formed when mixing.

Cure

Master Bond Polymer System EP37-3FLFAO can be cured at room temperature or at elevated temperatures as desired. At room temperature the Master Bond Polymer System EP37-3FLFAO develops 90% of its maximum bond strength within 5-7 days. The bond strength then increases continuously for 1-2 days. Faster cures can be realized at elevated temperatures, e.g., 3-5 hours at 200°F to obtain about 90% of ultimate strength. At room temperature, bonds then continue to gain in strength with the maximum reached within 1-2 days. Remove any excess adhesive promptly before it hardens with a spatula. Then wipe with a rag or solvent such as MEK, toluene or acetone. The thinner the section of epoxy, the slower the rate of cure.

Handling and Storage

All epoxy resins should be used with good ventilation taking care to minimize skin contact. EP37-3FLFAO employs a low toxicity hardener. To remove resin or hardener from skin, use solvent, then wash with mild soap and water. If material enters the eyes, flood with water and consult a physician. Optimum storage is at or below 75°F in closed containers. No special storage conditions are necessary. Containers should however be kept closed when not in use to avoid contamination. Cleanup of spills and equipment is readily achieved with aromatic or ketone solvents employing proper precautions of ventilation and flammability.