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Highly efficient platinum-based catalyst for rapid cure acceleration in addition-cure silicone sealants.
Excellent thermal stability enabling consistent performance across wide processing temperature ranges.
Low volatility formulation minimizes outgassing and supports high-reliability applications.
Precise reactivity control ensures reproducible pot life and cure profile in automated dispensing systems.
Compatible with standard DOWSIL™ EA-series base polymers and fillers without compromising adhesion or flexibility.
Automotive lighting assemblies requiring optical clarity and long-term UV resistance.
Electronics encapsulation and conformal coating for power modules and sensors.
LED packaging where low ionic contamination and thermal cycling durability are critical.
Aerospace interior sealing components exposed to stringent outgassing and flammability requirements.
Medical device housings demanding ISO 10993-compliant material compatibility and biostability.
| Chemical Type | Platinum complex (divinyltetramethyldisiloxane complex) |
| Product Form | Clear, low-viscosity liquid |
| Appearance | Colorless to pale yellow liquid |
| Primary Applications | Addition-cure silicone sealants and encapsulants |
| Key Features | Cure accelerator, thermally stable, low-volatility, precision dosing compatible |
| Benefits | Improved production throughput, enhanced bond reliability, reduced post-cure aging effects |
| Storage Conditions | Store at 2–8 °C in original sealed container; protect from moisture and direct sunlight |
| Shelf Life | 24 months from date of manufacture when stored as specified |
Q1: What is the primary function of DOWSIL EA 3500G in silicone sealant formulations?
A: DOWSIL EA 3500G is a platinum-based catalyst designed to accelerate the hydrosilylation curing reaction in addition-cure (platinum-cure) silicone elastomers and sealants. It enables rapid, low-temperature crosslinking with excellent control over pot life and cure profile.
Q2: Is DOWSIL EA 3500G compatible with common silicone base polymers and fillers?
A: Yes — it is formulated for compatibility with standard vinyl-functional polydimethylsiloxane (PDMS) gums and resins, as well as common reinforcing and non-reinforcing fillers (e.g., fumed silica, calcium carbonate). Compatibility with specific additives should be verified experimentally due to potential inhibition by certain heteroatom-containing compounds.
Q3: How should DOWSIL EA 3500G be handled and stored to maintain activity?
A: Store in original sealed containers under cool, dry conditions, protected from moisture, direct sunlight, and ambient contaminants. Avoid prolonged exposure to air or elevated temperatures during handling, as platinum catalysts can be deactivated by sulfur-, nitrogen-, phosphorus-, or tin-containing substances.
Q4: Can DOWSIL EA 3500G be used in food-contact or medical-grade silicone sealants?
A: While DOWSIL EA 3500G is intended for industrial and technical applications, its suitability for regulated end uses depends on full formulation compliance, processing conditions, and final product testing. Dow does not make blanket regulatory claims for this catalyst — formulators must validate conformance with applicable food contact, medical, or other jurisdictional requirements.
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