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Epoxy Adhesive 

Description
9739 is a two part epoxy adhesive which provides excellent temperature resistance and good adhesion to a variety of substrates. It is readily mixed and dispensed in assembly operations.

Features
High Temperature Resistance                                     Black Color                                       Thixotropic Paste
Good Chemical Resistance                                          Heat or RT Cure

Typical Properties
                                                                                  Part A                  Part B                    Mixed
Color                                                                        Black                     White                    Black
Viscosity @ 77°F, poise                                          8,000-20,000        15,000-30,000
Specific Gravity @ 77°F                                           1.47                      1.201.41
Density, Lbs/Gal                                                     12.2                      10.0                        11.7
Shelf Life @ 77°F                                                     24 months           24 months

Handling
Mixing : This product requires mixing two components together just prior to application to the parts to be bonded. Complete mixing is necessary.

Mix Ratio                            Part A                                 Part B
By Weight                           100                                      25
By Volume                          3.3                                       1
Pot Life, 50 grams              90 minutes

Application
Mixing: Combine Part A and Part B in the correct ratio and mix thoroughly. THIS IS IMPORTANT! Heat buildup during or after mixing is normal. Do not mix quantities greater than one pound (1 lb.), as excessive heat buildup can occur.  Mixing smaller quantities will minimize the heat buildup.

Applying: Bonding surfaces should be clean and dry. For optimum surface preparation, consult Dexter's Bulletin " Preparing the Surface for Adhesive Bonding". Hysol 9739 can be applied with a spatula, brush or dispensing machine. Once the adhesive is dispensed, the bonded parts should be held in contact until the part has developed handling strength. Fixturing can be removed at this point. Since full bond strength has not yet been attained, load application should be small at this time.

Curing: Hysol 9739 will cure to ultimate properties in 3 days at room temperature. Oven temperatures up to 300°F can be used. At 300°F complete cure will take place in 15-20 minutes.  Lower temperatures can also be used.

Cleanup: It is important to remove excess adhesive from the work area and application equipment before it hardens. Denatured alcohol and many common solvents are suitable for removing uncured adhesive. Consult with your supplier's information pertaining to the safe and proper use of solvents.

Bond Strength Performance
Tensile Lap Shear Strength
Tensile lap shear strength was tested on etched aluminum per ASTM D1002 after curing for 20 minutes at 300°F.

Substrate                                    Test Temp. °F                                  Typical Results, psi
Etched Aluminum                   77                                                       2500
                                                   300                                                     1000
                                                   -20                                                      2500
Vinyl Ester BMC                      77                                                        850
                                                   300450

Environmental Exposure
Tensile lap shear strength bonds on etched aluminum were exposed to various conditions then allowed to recover for 24 hours and tested at  75°F per ASTM D1002.

Exposure                                                                                              Typical Results, psi
14 days @ 190°F                                                                                  2500
14 days @ 100°F and 100% Relative Humidity                                2500
14 days Immersion in 300°F Motor Oil                                            2500
10 Thermal Cycles:                                                                               2300
16 hours @ 100°F/100% RH
4 hours @ -40°F
4 hours @ 190°F

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