LORD CoolTherm® SC-305 thermally conductive silicone encapsulant is a two-component system designed for encapsulation applications. It is suited for a variety of electronics applications where high heat dissipation isrequired.

CoolTherm SC-305 encapsulant can be either room temperature cured or heat cured for maximum adhesion.
 

Features and Benefits
Low Stress – exhibits low shrinkage and stress on components as it cures.
High Thermal Conductivity – provides high thermal conductivity for applications where superior heat dissipation is required.
Durable – composed of an addition-curing polymer that will not depolymerize when heated in confined spaces.
Environmentally Resistant – provides excellent thermal shock resistance and flame retardancy.
UL Rated – provides excellent flame retardancy; UL 94 V-0 certified.
 

Application
Mixing – Thoroughly mix each component prior to combining resin and hardener. Mix CoolTherm SC-305 resin with CoolTherm SC-305 hardener at a 1:1 ratio, by weight or volume, until uniform in color. Automatic meter/mix/dispense equipment may be used for high volume production. Unless a closed-chamber mechanical mixer is used, air may be introduced into the encapsulant system either during mixing or when catalyzing the mixture. Electrical properties of the silicone encapsulant are best when air bubbles and voids are minimized. Therefore, in extremely high voltage or other critical applications, vacuuming may be appropriate.
Applying – Apply silicone encapsulant using handheld cartridges or automatic meter/mix/dispense equipment. Avoid applying encapsulant 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 encapsulant to the surface and allow it to set for the normal cure time.
Curing – Allow encapsulant to cure for 24 hours at room temperature (25°C), for 30 minutes at 60°C, or for 10 minutes at 100°C. This time-at-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 of each component is nine months when stored at 25°C in original, unopened container.
CoolTherm SC-305 encapsulant 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.