Key Technical Specifications

• Product Type: One-part moisture cure silicone electrical sealant
• Base Chemistry: Polydimethylsiloxane (PDMS) sealant
• Cure System: Room temperature moisture cure (RTV)
• Application Form: 300 ml cartridge
• Working Time: Approximately minutes to 1 hour before skin formation
• Full Cure: ~90% properties achieved within 24–72 hours (depending on conditions)
• Cure Depth: Approximately 0.25 inch per 7 days (surface-to-inward cure)
• Operating Conditions: Cures at 30–80% relative humidity

Approvals & Specifications

• UL Recognition: Underwriters Laboratories UL 94 (at specified thickness)
• Electrical Applications: Designed for PCB and electronic assembly protection
• Industry Standard: Dow silicone RTV electrical sealant platform

Typical Aircraft MRO & AOG Applications

• Sealing and protection of electronic assemblies and PCBs
• Vibration and stress relief in avionics components
• Moisture protection for electrical enclosures
• Rapid in-field repair of electrical systems during AOG events
• Component bonding and encapsulation in maintenance operations

Compatibility & Safety Notes

• Compatibility: Compatible with a wide range of electronic and aerospace materials
• Curing Environment: Requires atmospheric moisture (do not fully seal during cure)
• Handling: Avoid contamination with moisture before application
• Thermal Assistance: Mild heat below 60°C (140°F) may accelerate cure
• Safety: Use in well-ventilated areas and follow standard silicone handling procedures

Packaging & Procurement

• Supplied in 300 ml cartridge format
• Single-component system—no mixing required
• Designed for standard dispensing equipment
• Shelf life dependent on storage conditions and “Use Before” date
• Must be stored tightly sealed to prevent moisture contamination

Why DOWSIL™ 738 Is Chosen for MRO & AOG

• No mixing required—reduces preparation time in urgent maintenance scenarios
• Room-temperature cure eliminates need for ovens or external curing equipment
• High elongation provides superior stress relief in dynamic assemblies
• Fast handling strength improves turnaround time in AOG situations
• Reliable electrical insulation enhances long-term avionics performance

Alternative Names

• RTV Electrical Silicone Sealant
• Moisture Cure Electronic Encapsulant
• One-Part Silicone PCB Sealant
• Room Temperature Vulcanizing Electrical Adhesive

Product Overview

DOWSIL™ 738 Electrical Sealant is a high-performance, one-part room-temperature vulcanizing (RTV) silicone adhesive designed for electrical and electronic protection applications. Engineered with a polydimethylsiloxane (PDMS) base, it cures via atmospheric moisture, eliminating the need for ovens or complex curing systems.

This advanced sealant delivers excellent flexibility, high elongation, and reliable stress relief, making it ideal for protecting sensitive electronic components in demanding aerospace and industrial environments. Its fast handling time and room-temperature cure significantly improve manufacturing and maintenance efficiency.

Call to Action

Enhance the reliability and performance of your electronic assemblies with DOWSIL™ 738 Electrical Sealant. Designed for speed, durability, and ease of use, it is the trusted solution for critical aerospace and MRO applications.

Contact us today to request pricing, technical datasheets, or to place an order for fast delivery and AOG support.