Product

Wholesale Electrical Industrial Silicone Sealant CL221C-L

Product Overview:

CL221C-L is a single-component, alcohol-based, neutral-cure, non-corrosive, room-temperature-curing silicone sealant. It complies with RoHS and REACH requirements and offers excellent waterproofing, dustproofing, moisture resistance, salt spray resistance, and aging resistance. It provides strong adhesion to various substrates, including metals, glass, and most plastics. Widely used for conformal coating and insulation protection of electronic circuit boards and components (e.g., moisture, dust, and corrosion resistance), as well as flowable transparent bonding applications.

Product Characteristics:

  • Eco-friendly formulation, solvent-free; complies with RoHS Directive, REACH Regulation, and FDA certification.
  • Single-component, neutral-curing at room temperature—no heating required, fast curing speed.
  • Excellent transparency, allowing clear visibility of PCB components after coating.
  • Superior self-leveling properties for easy application.
  • Strong adhesion to glass, metals, PC, PCB, and other substrates.
  • Outstanding protective properties:
    • Waterproof, moisture-proof, dustproof.
    • Resistant to salt spray, aging, shock, leakage, corrosion, mold, and loosening of components.
    • Excellent electrical insulation.
  • Exceptional temperature resistance:
    • Remains flexible at -50°C (no brittleness, hardening, or cracking).
    • Stable at 150°C (no softening or degradation), maintaining long-term elasticity.

Primary Applications:

  • Widely used for insulation protection of circuit boards and electronic components.
  • Ideal for:
    • Hybrid ICs, automotive ECU boards, electronic PCBs.
    • Aviation instruments, flexible printed circuits (FPCs).
    • Computer control boards, industrial PCBs.
    • Semiconductor circuit protection, home appliance controllers.
    • Outdoor LED displays.
  • Customizable: Can be formulated into colored coating adhesives with bonding or confidentiality functions per customer requirements.
  • Transparent flowable bonding & sealing:
    • Bonding glass kettles to stainless steel heating bases.
    • Other transparent self-leveling adhesive/sealing applications.

Key Features:

  • Eco-friendly formulation, solvent-free; complies with RoHS Directive, REACH Regulation, and FDA certification.
  • Single-component, neutral-curing at room temperature—no heating required, fast curing speed.
  • Excellent transparency, allowing clear visibility of PCB components after coating.
  • Superior self-leveling properties for easy application.
  • Strong adhesion to glass, metals, PC, PCB, and other substrates.
  • Outstanding protective properties:
    • Waterproof, moisture-proof, dustproof.
    • Resistant to salt spray, aging, shock, leakage, corrosion, mold, and loosening of components.
    • Excellent electrical insulation.
  • Exceptional temperature resistance:
    • Remains flexible at -50°C (no brittleness, hardening, or cracking).
    • Stable at 150°C (no softening or degradation), maintaining long-term elasticity.
  •  

Primary Applications:

  • Widely used for insulation protection of circuit boards and electronic components.
  • Ideal for:
    • Hybrid ICs, automotive ECU boards, electronic PCBs.
    • Aviation instruments, flexible printed circuits (FPCs).
    • Computer control boards, industrial PCBs.
    • Semiconductor circuit protection, home appliance controllers.
    • Outdoor LED displays.
  • Customizable: Can be formulated into colored coating adhesives with bonding or confidentiality functions per customer requirements.
  • Transparent flowable bonding & sealing:
    • Bonding glass kettles to stainless steel heating bases.
    • Other transparent self-leveling adhesive/sealing applications.
  •  

Technical Specifications

PropertyTest ValueTest Method
AppearanceTranslucent fluidVisual Inspection
Tack-free Time10-20 minsGB/T13477.5-2002
Density1.02g/cm3GB/T13477.2-2002
Hardness (Shore A)30±5GB/T 531.1-2008
Tensile Strength0.56 MPaGB/T 528-2009
Elongation at break100%GB/T 528-2009
Volume resistivity1.0×1015 ,,W.cmGB/T 1692-2008
Dielectric strength18KV/mmGB/T 1695-2005

Note:Testing conditions: 23±2°C, 50±5% RH.

Application Guidelines

Optimal Conditions: Temperature 4°C–40°C, relative humidity 40%–80%.

1.Surface Preparation

  • Clean substrates thoroughly using solvents such as anhydrous ethanol, isopropanol, or acetone to remove rust, dust, grease, and moisture.

2.Application

  • Cut the nozzle with a utility knife and dispense the adhesive evenly onto the prepared surface.
  • Align and fix the bonded surfaces within the tack-free time (6 minutes).
  • Allow curing at room temperature for 24 hours before use.

3.Storage After Use

  • Tighten the cap immediately after use.
  • If a skin forms at the nozzle, remove it before reuse.

Packaging Specifications:

  • 300 mL/cartridge: 24 cartridges per box.
  • 2.6 L/sausage: 4 sausages per box.
  • Steel drums: 200 kg net weight per drum.

Storage

  • Store in a cool, dry place below 27°
  • Shelf life: 12 months from the production date.
  • Handle and transport as general chemicals.

Safety&Precaution

  • Keep out of reach of children.
  • Skin contact: Wipe off immediately and rinse with water.
  • Eye contact: Flush with water for 15 minutes and seek medical attention.
  • Use in well-ventilated areas.

Important Notes

  • Users must thoroughly understand product properties and perform compatibility tests prior to application.
  • Due to the diversity of real-world applications, our company does not guarantee performance under specific conditions and assumes no liability for direct, indirect, or incidental damages.
  • For technical support, contact our engineers for tailored solutions.

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