HUMISEAL HumiSeal 1C51 (1-LTR-CAN)

HumiSeal® 1C51 Silicone Conformal Coating

Overview

HumiSeal® 1C51 is a single-component, VOC-free, fast thermal curing silicone conformal coating designed to provide reliable environmental protection for electronic assemblies. Its low viscosity and extended pot life make it suitable for both dipping and spraying applications. The coating offers excellent flexibility, high dielectric performance, and includes an optical brightener for inspection under black light.

Key Technical Specs

• Product Type: Single-component silicone conformal coating
• Curing Method: Thermal cure
• VOC Content: 0 g/L
• Density: 0.99 ± 0.01 g/cm³
• Solids Content: 98% by weight
• Viscosity: 630 ± 150 centipoise
• Recommended Coating Thickness: 50-200 microns
• Recommended Cure: 10-15 minutes at 105-130°C
• Optimum Properties Time: Approximately 15 minutes
• Flammability Rating: UL 94 V-0

Approvals & Specifications

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

Electrical & Thermal Performance

• Thermal Shock Resistance: 50 cycles from -65°C to 200°C (MIL-I-46058C)
• Glass Transition Temperature: Below -65°C
• Coefficient of Thermal Expansion: 296 ppm/°C
• Dielectric Withstand Voltage: >1500 volts
• Dielectric Breakdown Voltage: 7000 volts
• Dielectric Constant: 2.4 at 1MHz and 25°C
• Dissipation Factor: 0.01 at 1MHz and 25°C
• Insulation Resistance: 5.0 � 10�? ohms
• Moisture Insulation Resistance: 1.0 � 10¹? ohms
• Fungus Resistance: Passes ASTM G21

Typical Applications

• Protection of electronic circuit assemblies
• Aerospace and defence electronics
• High reliability electrical systems
• PCB environmental protection
• Applications requiring flexible silicone protection

Application Methods

• Dipping: Controlled immersion and withdrawal speed of 5-15 cm/min recommended for uniform coating thickness
• Brushing: Suitable for manual application; coating uniformity depends on operator technique
• Spraying: Compatible with conventional spray equipment; adequate ventilation required
• No thinner required or recommended

Curing & Processing Notes

• Thermal curing performance depends on oven type, loading conditions, and component heat sink characteristics
• Cure inhibition may occur with certain materials including amines, acrylates, and some latex rubber compounds
• Material compatibility testing is recommended before production use
• Cotton gloves are recommended when handling assemblies before coating

Compatibility & Safety Notes

• Apply only in well-ventilated areas
• Avoid inhalation of vapours or spray mist
• Avoid skin and eye contact
• Refer to Safety Data Sheet before use
• Follow local and national health and safety regulations

Storage & Shelf Life

• Shelf Life: 12 months under recommended storage conditions
• Store at 25°C or below in tightly closed containers
• Protect from direct sunlight
• Cold storage (-15°C to 4°C) can extend shelf life
• If refrigerated, allow product to equilibrate for 24 hours before use

Packaging & Procurement

• Available through HumiSeal global supply network
• Recommended stripper: HumiSeal® Stripper 1091

Why This Product is Chosen for Aerospace / Electronics MRO

• VOC-free formulation supports controlled manufacturing environments
• Excellent flexibility for thermal cycling applications
• High dielectric strength for electronic protection
• Fast thermal cure reduces processing time
• Black-light inspection capability improves quality control

Practical Suggestions for Your Team

• Ensure assemblies are properly cleaned before coating
• Validate compatibility with existing PCB materials and processes
• Maintain controlled coating thickness between 50-200 microns
• Use adequate ventilation during spraying operations
• Allow refrigerated material to return to room temperature before application

Manufacturer / Aviation & Electronics Spec Codes

• Product Name: HumiSeal® 1C51 Silicone Conformal Coating
• Product Type: Silicone protective conformal coating
• Specifications: MIL-I-46058C / IPC-CC-830
• Compliance: RoHS 2011/65/EU
• UL Recognition: E105698