HUMISEAL HumiSeal 1C49 (1-LTR-CAN)

HumiSeal® 1C49 Silicone Conformal Coating

Overview

HumiSeal® 1C49 is a high-build, moisture-curing silicone conformal coating designed to provide excellent environmental and moisture protection for printed circuit assemblies (PCAs). The solvent-free, VOC-free silicone formulation delivers outstanding flexibility, electrical insulation performance, and long-term protection in demanding aerospace, electronics, and industrial environments. The coating fluoresces under UV light for easy inspection and can be repaired when required.

Key Technical Specs

• Product Type: Single-component silicone conformal coating
• Cure Mechanism: Moisture curing
• VOC Content: 0 g/L
• Solids Content: Minimum 95% by weight
• Density: 0.97 ± 0.03 g/cm³
• Viscosity: 9000 ± 1500 cP
• Recommended Coating Thickness: 50-200 microns
• Finish: Transparent silicone coating with UV fluorescence
• Recommended Cure: 24 hours at room temperature or 20 minutes at 76°C
• Optimum Properties Achieved: 7 days

Approvals & Specifications

• MIL-I-46058C qualified
• IPC-CC-830 compliant
• RoHS Directive 2011/65/EU compliant
• UL Recognized - File Number E105698

Mechanical Properties

• Glass Transition Temperature: < -65°C
• Coefficient of Thermal Expansion: 367 ppm/°C
• Tensile Strength: 30-50 psi
• Elongation: 80-120%
• Flammability Rating: UL94 V-1
• Storage Modulus:
  • 408 MPa at -40°C
  • 1.6 MPa at 25°C
  • 1.4 MPa at 80°C

Typical Applications

• Protection of printed circuit assemblies
• Aerospace electronic systems
• Avionics and high-reliability electronics
• Industrial control equipment
• Electronics exposed to moisture, temperature cycling, and harsh environments

Application Methods

• Brushing: Suitable for manual application; film uniformity depends on technique and component density
• Dipping: Controlled immersion and withdrawal speed of 5-15 cm/min recommended for consistent coating thickness
• Spraying: Requires equipment suitable for high-viscosity coatings; conventional spray equipment may introduce bubbles
• No thinner required or recommended

Compatibility & Safety Notes

• Apply only to clean substrates or assemblies processed with compatible low-residue materials
• Conduct compatibility testing with specific assembly materials and processes
• Use in well-ventilated areas
• Avoid contact with skin and eyes
• Refer to Safety Data Sheet before use

Storage & Shelf Life

• Store at 27°C or below
• Keep containers tightly closed and protected from direct sunlight
• If partially used, purge container with dry nitrogen before resealing
• Allow product to equilibrate for 24 hours at room temperature before use
• Shelf Life: 12 months at room temperature

Packaging & Procurement

• Available as a single-component ready-to-use coating
• Recommended stripper: HumiSeal® Stripper 1091

Why This Product is Chosen for Aerospace / Electronics MRO

• Provides durable moisture and environmental protection
• VOC-free formulation supports controlled manufacturing environments
• Excellent flexibility prevents cracking during thermal cycling
• UV fluorescence allows rapid inspection and quality control
• Repairable coating simplifies maintenance activities

Practical Suggestions for Your Team (AOG / MRO Mindset)

• Ensure assemblies are fully clean and dry before coating
• Control coating thickness within the recommended 50-200 micron range
• Use suitable high-viscosity spray equipment to avoid coating defects
• Allow full cure time before returning electronic assemblies to service
• Maintain dry storage conditions to maximise product life

Manufacturer / Aviation Specification Codes

• Product Name: HumiSeal® 1C49 Silicone Conformal Coating
• Product Type: Moisture-curing silicone conformal coating
• Specification: MIL-I-46058C / IPC-CC-830
• Application: Printed circuit assembly protection