Surface Preparation
Substrates should be clean and dry, with oil, dust, and surface contamination removed before bonding.
Adhesive 01
DPA-8800 Structural Silicone Adhesive
DPA-8800 is a two-component room-temperature-curing silicone rubber designed for spacecraft solar-wing bonding, space structural bonding, and sealing.
| Item | Value |
|---|---|
| Appearance | Colorless to pale-yellow viscous liquid |
| Viscosity at 25°C | 10,000–30,000 mPa·s |
| Volatile content | ≤ 3.0% |
| Mixing ratio A:B | 100:5 by weight |
| Cure mode | Room-temperature cure |
| Pot life | ≥ 2 h |
| Surface cure time | ≤ 24 h |
| Full cure time | ≤ 48 h |
| Best performance | After 7 days |
Suggested process note: surfaces should be clean, dry, and free of oil or dust. Mix A:B at 100:5 by weight and degas before use. Apply evenly, position the bonded parts, and allow curing under clean conditions.
DPA-8800 Processing
Use, storage, and precautions.
Mixing
Mix A:B at 100:5 by weight. Degassing is recommended. The curing agent may be adjusted according to customer gel-time requirements.
Application
Apply evenly, assemble the bonded parts, and position appropriately to maintain interface contact.
Room-Temperature Cure
Initial loading is possible after 24 hours, basic cure occurs after 48 hours, and best performance is reached after 7 days.
Storage / Packaging
Store sealed in a cool, dry place away from direct sunlight. Shelf life is 6 months unopened at room temperature. A and B components are separately packaged and supplied as a kit.
Precautions
Use mixed material within the pot life. Do not load, move, or expose the part to harsh environments before full cure. Avoid skin and eye contact. Users must validate suitability under actual working conditions.
Adhesive 02
GPA-8811 Cover-Glass Bonding Silicone
GPA-8811 is an addition-cure, two-component transparent silicone designed for bonding cover glass to solar cells.
| Item | Value |
|---|---|
| Appearance | Transparent liquid |
| Viscosity | ≤ 5,000 mPa·s |
| Mixing ratio A:B | 9:1 by weight |
| Pot life | ≥ 2 h |
| Cure time | ≤ 2 h at 80°C |
| Use temperature | −165°C to 150°C |
Suggested process note: mix A:B at 9:1 by weight, degas, and apply to cleaned substrates. Room-temperature pot life is not less than 2 hours. The material can cure within 2 hours at 80°C; curing temperature should not exceed 150°C.
GPA-8811 Processing
Use, storage, and precautions.
Mixing
Mix A:B at 9:1 by weight until uniform, then degas before bonding.
Pot Life / Cure
At room temperature, pot life is not less than 2 hours. The material can cure within 2 hours at 80°C. Higher temperature accelerates cure.
Temperature Limit
The TDS recommends that curing temperature should not exceed 150°C.
Surface Preparation
Clean substrate surfaces with solvent before bonding and allow them to dry before adhesive application.
Clean Process Environment
Keep the work environment clean and avoid catalyst poisoning, which can cause no cure or incomplete cure.
Storage / Precautions
Store sealed in a cool, dry, ventilated place away from sunlight, ignition sources, and heat. Shelf life is 6 months unopened at room temperature. Use mixed material within the pot life and validate suitability under actual conditions.
Discuss Your Solar Cell Protection Stack
Tell us your orbit, cell type, required thickness, optical target, thermal range, and integration route. Heliofold can provide SCPI film, compatible silicone adhesives, and selected cover glass materials for evaluation.