T-88® is a high performance, non-brittle, two-part epoxy adhesive designed to give superior results under adverse conditions. These include woods such as oak, teak, maple, mahogany, apetong, araki, pau lope, ipe, and other difficult to bond woods. T-88 is also a great all purpose adhesive for other woods, metal, ceramic, glass and many non-polyethylene based plastics.
T-88 has exceptional adhesion to most clean surfaces. However, it does not bond well to tin, zinc or waxy thermoplastics such as polyethylene. When fully cured, it is unaffected by water, oil, gasoline, and virtually all chemicals. It will not stain wood and is immune to fungus and rot.
The adhesive may be used as is, in normally fitted joints, and will cure in any thickness without shrinkage. T-88 is clear amber and becomes virtually invisible when varnished.
T-88 is unique in that it may be applied to damp wood, provided the adhesive is worked well into the surface. Glue line thickness is not critical and clamping is not necessary if the joint is undisturbed during set-up of the adhesive. However, when bonding wood where end-grain is exposed T-88 may be thickened slightly to prevent excessive absorption. Coverage in average bond joints is 50–100 sq. ft. per gal. See special instructions below for bonding oak, teak, and other hard to bond woods.
T-88’s part A and B are mixed 1:1 by volume using a graduated measuring cup. Weight ratio is 100 parts of A to 83 parts of B. Excessive Part B will degrade, rather than expedite cure and should be avoided. Care should be taken that mixing is thorough and streaks can not be seen. The most common error is incomplete mixing. Please mix thoroughly, being sure to scrape the sides and bottom well while mixing.
Pot life of the mixed adhesive is approximately 45 minutes at 70°F. However, a coated joint may still be pulled up tight (clamped) for up to two hours after application, even though the product has started to cure. Both surfaces MUST be coated for this to work. It is much simpler to make sure both surfaces are in contact before the pot life has expired. Cap containers promptly after use. Mixing in small lots or with large surface area exposure will extend pot life.
At 70°F, T-88 will harden in 6–8 hours and will reach functional strength in 24 hours. T-88 has been specifically formulated to cure as low as 35°F without reduction in strength; this cure will require approximately one week. At 150°F, T-88 will set within 30 minutes and develop maximum bond strength and impact resistance after 2 hours. If excessive flow-out occurs, allow 2–4 hours at room temperature before heat cure.
NOTE: If you want to use a penetrating epoxy sealer, please do so AFTER bonding with T-88, or lightly sand or scuff the epoxy-treated surface if the penetrating epoxy sealer has been applied.
White oak is a highly porous wood with a strong tendency to absorb resin and yield starved joints of substandard strength. Preferred practice is to apply a liberal coat of T-88 to both surfaces, and without mating allow the separate parts to stand open for 30–45 minutes. Dull spots indicate complete absorption and should be touched up with more T-88, after which the structure should be assembled and clamped with minimal pressure, just enough to ensure contact. Alternatively, oak can be pre-sealed with a thin coat of T-88 on both mating surfaces and cured separately; then sand each surface lightly to level, apply fresh T-88 and join lightly.
Teak, being an oily wood, must be freed of surface oil to achieve optimum adhesion. With a clean cotton rag liberally moistened with lacquer thinner, vigorously wipe area to be bonded. While surface is still moist with solvent, wipe with a dry rag and allow to dry. If necessary, repeat wiping until surface dries to a whitish color indicating extraction of surface oil. Bond within eight hours of cleaning.
Because of its resinous nature, Douglas fir tends to exude minute amounts of material which may act as a weak interlayer when adhesive is applied. To prevent difficulties of this type, sand the wood with 60 to 120 grit abrasive and thoroughly remove sanding debris. Apply adhesive within 48 hours.
Method One (Recommended)
Method One (Recommended)
Method One (Recommended)
Stir at room temperature until powder dissolves.
Wear disposable gloves or barrier skin creams when working with epoxy resins. Never use solvents to remove epoxies from your skin. Some solvents present hazards worse than epoxies and can actually be absorbed into the body. Use a good waterless hand soap and plenty of paper towels to remove epoxy from your skin. Then apply a good medicated skin cream to replace the natural oils removed by the hand soap. If you get gummy, half-cured material on your skin, let it cure and peel it off the next day. Cured epoxy doesn’t stick well to skin or hair.
Separate resin and hardener components will have a storage life in excess of one year if containers are kept well closed and stored below 90°F. Allow cold containers to reach room temperature before opening.
|Mix Ratio by Volume||100:100|
|Mix Ratio by Weight||100:83|
|Mixed Viscosity||20,000 cps|
|Tensile Strength||7,000 psi|
|Flexural Strength||11,500 psi|
Polyester Laminate: 2,800 psi
Concrete: 1,100 psi
Wood (Maple): 1,800 psi
Aluminum: 2,000 psi
Galvanized Steel: 1,800 psi
Copper: 1,650 psi
|Lap-Shear Strength vs. Temperature (Aluminum Tensile Shear)||
67°F: 2,500 psi
75°F: 2,000 psi
150°F: 1,300 psi
180°F: 1,000 psi
|Heat Deflection Temperature||119°F (49°C)|
|Maximum Service Temperature||160°F (71°C)|
|Minimum Application Temperature||35°F (2°C)|
|Gel Time @ 77°F (25°C)||60 Minutes (100g mixture)|
|Full Cure @ 77°F (25°C)||72 Hours|
|Adhesive Glue Lines
Mixed adhesive coverage in square feet per gallon
|Clamped Joints||3–4 mils||400||500|
|Vacuum Bagging||8 mils||200||200|
|Stapled Veneer||20 mils||80||80|
ALWAYS MIX THOROUGHLY!
IMPROPER MIXING IS THE GREATEST CAUSE OF EPOXY SYSTEMS FAILURE.