Features Of Dow DOWSIL 65 Additive
Enhances adhesion between silicone elastomers and challenging substrates including plastics, metals, and painted surfaces.
Improves thermal stability of silicone-based formulations up to 200 °C during cure and service life.
Enables low-temperature vulcanization without compromising crosslink density or mechanical integrity.
Reduces interfacial stress and minimizes delamination in multi-material assemblies.
Compatible with both platinum-cure and peroxide-cure silicone systems without inducing inhibition.
Typical Applications Of Dow DOWSIL 65 Additive
Automotive lighting assemblies requiring durable silicone-to-PC or silicone-to-aluminum bonding.
Medical device encapsulation where silicone seals must adhere reliably to thermoplastic housings.
Consumer electronics gasketing for water-resistant enclosures combining silicone with ABS or polycarbonate.
Industrial sensors with hybrid construction needing long-term adhesion under thermal cycling conditions.
LED module potting applications demanding optical clarity and substrate compatibility.
Specifications Of Dow DOWSIL 65 Additive
| Chemical Type | Silane-modified organosilicon additive |
| Product Form | Low-viscosity clear liquid |
| Appearance | Colorless to pale yellow, transparent liquid |
| Primary Applications | Adhesion promoter for high-performance silicone elastomers |
| Key Features | Platinum-cure compatible, non-volatile, hydrolytically stable |
| Benefits | Improved bond durability, reduced surface preparation, extended service life |
| Storage Conditions | Store in original sealed container at 15–25 °C; protect from moisture |
| Shelf Life | 12 months from date of manufacture when stored properly |
Dow DOWSIL 65 Additive – Frequently Asked Questions (FAQ)
Q1: What is the primary function of DOWSIL 65 Additive in silicone formulations?
A: DOWSIL 65 Additive is a specialty silicone-based additive designed to enhance surface slip, reduce coefficient of friction, and improve release performance in high-temperature cured silicone elastomers and RTV systems.
Q2: Is DOWSIL 65 Additive compatible with platinum-cure (addition-cure) silicone systems?
A: Yes, DOWSIL 65 Additive is formulated to be compatible with both platinum-cure and peroxide-cure silicone systems, and it does not inhibit catalytic activity when used at recommended dosage levels.
Q3: How should DOWSIL 65 Additive be incorporated into a silicone compound?
A: It is typically added during the mixing stage—either before or after filler incorporation—and thoroughly dispersed using standard high-shear mixing equipment. Pre-dilution in a low-viscosity silicone fluid may aid uniform distribution in viscous systems.
Q4: Does DOWSIL 65 Additive affect the mechanical properties of the final cured silicone?
A: At typical use levels, it generally maintains key mechanical properties such as tensile strength and elongation. However, excessive loading may reduce tear resistance or modulus; formulation optimization is recommended for critical performance requirements.
Q5: Can DOWSIL 65 Additive be used in applications requiring FDA compliance for food contact?
A: DOWSIL 65 Additive is not pre-approved for direct food-contact applications under FDA 21 CFR. Formulators must conduct full regulatory evaluation—including extractables testing and migration assessment—as part of their finished product’s compliance strategy.
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