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One-component, solvent-based silicone primer for enhanced adhesion to low-surface-energy substrates.
Fast-drying formulation enables rapid handling and short production cycle times.
Excellent compatibility with Dow SILASTIC™ and DOWSIL™ liquid silicone rubbers (LSRs) and RTVs.
Improves bond strength and long-term durability on challenging surfaces including polyolefins, fluoropolymers, and filled plastics.
Low VOC content supports industrial compliance with common environmental and safety regulations.
Priming polypropylene (PP) and polyethylene (PE) parts prior to silicone overmolding.
Surface preparation for silicone bonding in automotive interior trim and fluid system components.
Adhesion promotion in medical device assembly involving silicone-to-plastic interfaces.
Pre-treatment of fluoropolymer (e.g., PTFE, FEP) substrates in sealing and gasketing applications.
| Chemical Type | Solvent-based silane-modified silicone primer |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow, low-viscosity solution |
| Primary Applications | Adhesion promotion for silicone elastomers on low-energy plastics and fluoropolymers |
| Key Features | One-component, air-dry, no mixing required |
| Benefits | Improved bond reliability, reduced delamination risk, simplified process integration |
| VOC Content | Approx. 65–70 wt% (typical) |
| Recommended Cure Conditions | Air dry at ambient temperature for ≥15 minutes prior to silicone application |
Q1: What is the primary function of DOWSIL 1200 OS Primer in silicone-based systems?
A: DOWSIL 1200 OS Primer is an organosilicon adhesion promoter designed to enhance interfacial bonding between silicone elastomers or sealants and challenging substrates such as metals, plastics, glass, and painted surfaces. It improves cohesive strength and long-term durability of the bonded assembly under thermal, mechanical, and environmental stress.
Q2: How should DOWSIL 1200 OS Primer be applied for optimal performance?
A: The primer is typically applied as a thin, uniform coat—by wiping, spraying, or dipping—onto the substrate surface prior to silicone application. Surfaces must be clean, dry, and free of oils or contaminants. Allow brief flash-off time (usually seconds to minutes) before applying the silicone material; full cure of the silicone system completes the bond development.
Q3: Is DOWSIL 1200 OS Primer compatible with both addition-cure and condensation-cure silicones?
A: Yes, it is broadly compatible with common platinum-catalyzed (addition-cure) and tin-catalyzed (condensation-cure) silicone formulations. However, compatibility should always be verified experimentally within the specific end-use formulation and processing conditions, as performance may vary depending on catalyst type, inhibitors, and filler systems.
Q4: Can DOWSIL 1200 OS Primer be used in high-temperature or outdoor applications?
A: Yes—it supports reliable adhesion across extended temperature ranges and contributes to improved resistance against UV exposure, humidity, and thermal cycling when used with appropriately formulated silicone materials. Its effectiveness in demanding environments depends on proper substrate preparation and full integration into a validated system design.
Q5: What safety and handling precautions should be observed?
A: As with all volatile organic compounds, use in well-ventilated areas and avoid prolonged skin contact or inhalation of vapors. Wear appropriate personal protective equipment—including nitrile gloves and safety glasses—and consult the Safety Data Sheet (SDS) for detailed handling, storage, and first-aid information.
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E-mail: wangxingqiang@ericwchem.com
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