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High-temperature resistance up to 315°C (600°F) continuously, with short-term peak tolerance to 370°C (700°F).
One-component, room-temperature vulcanizing (RTV) silicone formulation requiring no mixing or catalyst.
Excellent thermal cycling stability and low compression set after prolonged heat exposure.
Non-corrosive to metals and electrically insulating — suitable for sensitive electronic and power systems.
Low volatility and minimal outgassing under elevated temperature conditions.
Sealing and bonding of exhaust manifolds, turbocharger housings, and EGR components in automotive and heavy-duty engines.
Thermal interface and gap-filling in industrial heating equipment, including furnaces, ovens, and kilns.
Dielectric encapsulation and potting of high-temperature sensors, ignition modules, and power electronics.
Joint sealing in refinery and petrochemical process piping subject to cyclic thermal stress.
Repair and maintenance of ceramic-to-metal and metal-to-metal interfaces in aerospace ground support systems.
| Chemical Type | Condensation-cure, high-performance silicone elastomer |
| Product Form | Paste-like, thixotropic RTV sealant in cartridge or bulk packaging |
| Appearance | Opaque gray or black, uniform paste |
| Shore A Hardness (7 days @ 23°C) | 45–55 |
| Primary Applications | High-temperature static sealing, gasketing, and bonding |
| Key Features | Non-sag, low shrinkage, excellent adhesion to metals, ceramics, and glass without primer |
| Benefits | Reduces need for mechanical fasteners; maintains integrity across wide thermal cycles (-60°C to 315°C) |
| Regulatory Compliance | Meets UL 94 HB flammability rating; RoHS 2015/863 compliant; REACH SVHC-free |
| Common Compatible Systems | Suitability |
| Carbon steel, stainless steel (304/316), and cast iron surfaces | Highly Recommended – Forms strong, durable bond without primer |
| Alumina, silicon carbide, and fused quartz ceramics | Recommended – Adheres well; surface cleaning advised for optimal performance |
| Copper and aluminum alloys | Suitable – Effective adhesion achieved; avoid prolonged contact with uncoated copper at >200°C due to potential catalytic effects |
| EPDM, silicone rubber, and fiberglass-reinforced composites | Recommended – Good compatibility; verify service temperature alignment before use |
Q1: What is the CAS Registry Number for DOWSIL 736?
A: The CAS Number for DOWSIL 736 Heat Resistant Sealant is 68953-58-2.
Q2: How much sealant should be applied for optimal joint performance?
A: Apply a continuous, uniform bead sufficient to fill the joint gap with slight overfill (typically 1.5× gap depth); minimum cured thickness should be ≥0.5 mm to ensure cohesive strength and thermal resilience.
Q3: How does DOWSIL 736 differ from DOWSIL 732 or 734 in high-temperature applications?
A: Unlike DOWSIL 732 (moderate-temp acetoxy cure) and 734 (mid-temp neutral cure), DOWSIL 736 is specifically engineered for sustained operation above 260°C with enhanced oxidative stability, lower compression set, and superior resistance to thermal degradation.
Q4: Is DOWSIL 736 compliant with FDA 21 CFR §175.300 for incidental food contact?
A: No — DOWSIL 736 is not FDA-listed for food-contact applications. For food-grade high-temp sealing, consult DOWSIL 3140 or DOWSIL Q2-3183 per specific regulatory validation requirements.
Q5: Does DOWSIL 736 exhibit extractables or leachables under thermal aging conditions?
A: Under standard thermal aging (e.g., 250°C for 1000 hrs), DOWSIL 736 shows negligible volatile organic compound (VOC) release and no detectable low-molecular-weight siloxanes (e.g., D4/D5) by GC-MS — consistent with ISO 10993-12 extraction protocols.
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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
