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High-performance, one-component, room-temperature vulcanizing (RTV) silicone adhesive sealant with excellent adhesion to glass, aluminum, stainless steel, and many plastics.
Offers superior resistance to weathering, UV exposure, ozone, and extreme temperatures ranging from –60 °C to +200 °C.
Low modulus formulation provides high flexibility and stress relief in dynamic joints and thermally cycling assemblies.
Non-corrosive, acetoxy-cure chemistry with rapid surface cure and consistent deep-section cure performance.
Meets UL 94 HB flammability rating and complies with RoHS and REACH directives for restricted substances.
Automotive lighting assemblies — bonding and sealing of headlamp, tail lamp, and LED modules.
Electronic enclosures and power supply housings requiring environmental protection and thermal management.
Architectural glazing systems — structural and perimeter sealing of insulating glass units (IGUs).
Industrial control panels and sensor housings exposed to outdoor or harsh industrial environments.
White goods and HVAC components where long-term reliability under thermal cycling is critical.
| Chemical Type | Acetoxy-cure, condensation-curing silicone polymer |
| Product Form | Paste, thixotropic, single-component |
| Appearance | Opaque white or translucent gel |
| Primary Applications | Adhesive bonding, sealing, and potting in automotive, electronics, and construction |
| Key Features | RTV cure, low modulus, non-corrosive, UV stable |
| Shore A Hardness (7 days, 23°C/50% RH) | 25–35 |
| Tensile Strength (ASTM D412) | ≈ 1.8 MPa |
| Service Temperature Range | –60 °C to +200 °C (continuous) |
Q1: What are the primary curing mechanisms and typical cure times for DOWSIL 3145?
A: DOWSIL 3145 is a one-component, moisture-curing RTV silicone that crosslinks upon exposure to atmospheric humidity. Initial skin formation typically occurs within 15–30 minutes under standard conditions (23°C, 50% RH), while full cure to handling strength may require 24–72 hours depending on joint thickness, temperature, and humidity.
Q2: Is DOWSIL 3145 suitable for bonding dissimilar substrates such as glass, aluminum, and painted surfaces?
A: Yes — DOWSIL 3145 offers strong adhesion to a broad range of substrates including glass, anodized and bare aluminum, stainless steel, and many coated or painted surfaces, without requiring primers in most cases. Surface cleanliness and compatibility testing under end-use conditions are recommended prior to full-scale implementation.
Q3: How does DOWSIL 3145 perform under thermal cycling and long-term UV exposure?
A: As a high-performance silicone elastomer, DOWSIL 3145 maintains flexibility and seal integrity across a wide service temperature range (typically −55°C to +200°C) and exhibits excellent resistance to weathering, ozone, and prolonged UV radiation — making it well-suited for outdoor and demanding industrial applications.
Q4: Can DOWSIL 3145 be over-painted, and what considerations apply?
A: DOWSIL 3145 is generally not recommended for over-painting, as most conventional paints and coatings do not adhere reliably to fully cured silicone surfaces. If painting is required, alternative non-silicone sealants or specialized silicone-compatible topcoats should be evaluated with thorough adhesion testing.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
