CoolTherm^® SC-3500 Thermally Conductive Silicone Gap Filler
 

CoolTherm^® SC-3500 thermally conductive, low volatile silicone gap filler is a two-component system designed to provide excellent thermal conductivity for electronic applications, while retaining desirable properties associated with silicones.

Features and Benefits:

Low Stress – exhibits low shrinkage and stress on components as it cures.

Durable – composed of an addition-curing polydimethyl siloxane polymer that will not depolymerize when heated in confined spaces.

Environmentally Resistant – provides excellent thermal shock resistance.

UL Rated – provides excellent flame retardancy; UL 94 V-0 certified.

Application:

Mixing – Mix CoolTherm SC-3500 resin with CoolTherm SC-3500 hardener at a 1:1 ratio, by weight or volume. Handheld cartridges or automatic meter/mix/dispense equipment should be used to avoid any air entrapment in the material. Manual mixing is not recommended.

Applying – Apply material using handheld cartridges or automatic meter/mix/dispense equipment.

• Handheld Cartridges

1. Load the cartridge into the applicator gun and remove the end caps.

2. Level the plungers by expelling a small amount of material to ensure both sides are level.

3. Attach mixing tip and expel a mixer’s length of material.

4. Apply material to substrate and mate the parts within the working time of the gap filler. Clamp in position until material reaches handling strength.

• Meter/Mix/Dispense Equipment

Contact your LORD representative if assistance is needed using this equipment.

Avoid applying CoolTherm SC-3500 gap filler to surfaces that contain cure inhibiting ingredients, such as amines, sulfur, or tin salts. If bonding surface is in question, apply a test patch of gap filler to the surface and allow it to set for the normal cure time. A liquid layer of silicone will remain on the surface if an inhibitor is present.

Curing – Allow material to cure for 24 hours at room temperature (25°C) or for 60 minutes at 80°C. This timeat-temperature profile refers to the time the material should be allowed to cure once it reaches the target temperature. Allowance should be made for oven ramp rates, parts with large thermal mass and other circumstances that may delay material reaching the target temperature.

Shelf Life/Storage:

Shelf life is nine months for CoolTherm SC-3500 resin and five months for CoolTherm SC-3500 hardener when stored upon receipt at 30°C or lower in original, unopened container. Cartridges should be stored tip down.

CoolTherm SC-3500 gap filler evolves minute quantities of hydrogen gas. Do not repackage or store material in unvented containers. Adequately ventilate work area to prevent the accumulation of gas.