High-performance silicone-based pressure-sensitive adhesive offering excellent adhesion to low-surface-energy substrates including fluoropolymers and siliconized release liners.
Outstanding thermal stability with continuous service capability up to 200 °C and short-term resistance to 250 °C.
Consistent peel adhesion and shear holding power across wide temperature and humidity ranges.
Low extractables and high purity—suitable for demanding applications in medical device assembly and electronics manufacturing.
Easy solvent-based coating process compatibility with standard gravure, reverse-roll, or slot-die application equipment.
High-temperature masking tapes for aerospace composite curing and paint-bake operations.
Release liner–backed labels and functional tapes in medical diagnostics and wearable sensor assemblies.
Bonding of silicone elastomers and polyimide films in flexible printed circuit (FPC) fabrication.
Thermal interface tapes for power electronics requiring long-term reliability under thermal cycling.
Die-cut gasketing and sealing components for LED lighting and automotive EV battery modules.
| Chemical Type | Platinum-cured silicone pressure-sensitive adhesive |
| Product Form | Solvent-based liquid (toluene/acetone/isopropanol blend) |
| Appearance | Clear, viscous liquid; slight amber tint |
| Primary Applications | High-temperature industrial tapes, medical device assembly, electronics bonding |
| Key Features | Low surface energy adhesion, thermal stability, low extractables, coating versatility |
| Benefits | Reliable performance in harsh environments, regulatory support for medical use, consistent processability |
| Storage Conditions | Store at 15–25 °C in sealed containers; protect from moisture and direct sunlight |
| Curing Method | Heat-activated platinum catalysis (typical cure: 120–150 °C for 2–5 minutes) |
Q1: What substrates does DOWSIL 7645 PSA bond well to?
A: DOWSIL 7645 demonstrates strong adhesion to a broad range of low-surface-energy substrates—including polyolefins (e.g., PP, PE), silicone rubber, fluoropolymers, and coated papers—as well as many high-energy surfaces like metals, glass, and PET, especially after appropriate surface preparation.
Q2: Is DOWSIL 7645 suitable for high-temperature applications?
A: Yes—DOWSIL 7645 retains cohesive strength and shear resistance at elevated temperatures, typically performing reliably in continuous service up to approximately 150 °C, with short-term exposure tolerance up to 200 °C depending on substrate and stress conditions.
Q3: How is DOWSIL 7645 typically applied in manufacturing?
A: It is commonly applied via roll coating, slot-die coating, or screen printing onto release liners or directly onto substrates, followed by drying/curing under controlled heat and dwell time to optimize tack, peel, and shear performance.
Q4: Does DOWSIL 7645 require a primer or surface treatment for optimal bonding?
A: While it exhibits excellent inherent adhesion to many challenging surfaces, performance on ultra-low-energy plastics or heavily contaminated substrates may be enhanced by corona, plasma, or flame treatment—or by applying a compatible priming layer, depending on the specific assembly requirements.
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E-mail: wangxingqiang@ericwchem.com
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