Features Of Dow DOWSIL 737 Neutral Cure Silicone Sealant
Neutral-cure chemistry eliminates corrosive by-products, making it safe for sensitive substrates including metals, glass, and coated surfaces.
Excellent adhesion to common construction materials without primer, including aluminum, anodized aluminum, glass, ceramics, and many plastics.
High movement capability (±25% joint movement) ensures long-term performance in dynamic joints subject to thermal expansion and contraction.
Superior weather resistance — UV stable, rain-resistant, and maintains elasticity across wide temperature ranges (–40 °C to +150 °C).
Low VOC formulation complies with stringent global environmental regulations, including ASTM C1184 and ISO 11600 Class 25LM.
Typical Applications Of Dow DOWSIL 737 Neutral Cure Silicone Sealant
Structural and perimeter glazing for commercial curtain walls and storefront systems.
Sealing of insulating glass (IG) units, especially where neutral cure is required to protect edge seals and spacers.
Weatherproofing of aluminum composite panels (ACP), metal cladding, and architectural precast concrete façades.
Joint sealing in cleanroom environments and pharmaceutical facilities where low-emission, non-corrosive sealants are mandated.
Interior and exterior expansion joints in high-rise buildings and infrastructure projects requiring durable, maintenance-free performance.
Specifications Of Dow DOWSIL 737 Neutral Cure Silicone Sealant
| Chemical Type | Acetoxy-neutral silicone polymer |
| Product Form | Thixotropic paste, single-component |
| Appearance | Opaque white or translucent beige, smooth uniform consistency |
| Primary Applications | Architectural glazing, IG unit secondary seal, metal and glass façade sealing |
| Key Features | Neutral cure, primerless adhesion, high movement capability, UV resistant |
| Benefits | No substrate corrosion, reduced labor cost (no priming), long service life, low maintenance |
| Curing Mechanism | Moisture-cured at ambient temperature and humidity |
| Shelf Life | 12 months from date of manufacture when stored unopened at ≤25 °C |
Dow DOWSIL 737 Neutral Cure Silicone Sealant – Frequently Asked Questions (FAQ)
Q1: What substrates is DOWSIL 737 compatible with?
A: DOWSIL 737 adheres well to a broad range of non-porous and low-energy substrates including glass, aluminum, anodized metals, painted surfaces, ceramics, and many plastics—without requiring a primer. It is not recommended for use on unprimed polyethylene, polypropylene, or Teflon® without prior adhesion testing.
Q2: Does DOWSIL 737 release acetic acid during cure?
A: No. As a neutral-cure silicone, DOWSIL 737 releases methanol or other non-corrosive alcohols upon curing—making it safe for use with sensitive metals, electronics, and architectural components where acid-cure sealants could cause corrosion or discoloration.
Q3: How does temperature affect the cure speed of DOWSIL 737?
A: Cure rate increases with higher ambient temperature and humidity, and slows significantly below 10°C or in low-humidity environments. For optimal performance, application is recommended between 10°C and 40°C with relative humidity above 40%.
Q4: Can DOWSIL 737 be overpainted?
A: Yes, once fully cured—typically after 7 days under standard conditions—DOWSIL 737 can accept most water-based and solvent-based paints. However, compatibility should be verified with a small test area, as paint adhesion and appearance may vary depending on formulation and surface preparation.
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