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Dow Corning® LDC 2577 D – Silicone Conformal Coating for moisture-resistant protection of PCBs

  • Item Name: Dow Corning® LDC 2577 D

  • Manufacturer: Dow Corning

  • Technologies: One-part RTV silicone resin

  • Color: Translucent, Yellow-green

  • Cure Type: Room temperature cure (moisture-activated) or heat cure

  • Package Size: 1 kg Bottle

  • Shelf Life: 6 months

1. Product Overview

Dow Corning® LDC 2577 D is a one-part, RTV silicone resin conformal coating designed for electrical and electronic assemblies. It provides excellent dielectric strength, flame resistance, flexibility across a wide temperature range, and enhanced moisture resistance. The material cures at room temperature upon exposure to atmospheric moisture, with optional accelerated heat cure. The coating is UV-detectable, easily repairable, and offers transparent protection suitable for both standard and solar applications.


2. Applications

  • Protective coating for rigid and flexible PCBs.

  • Thick film circuitry requiring high dielectric properties.

  • Impregnation of porous materials (e.g., ceramics) to improve moisture resistance.

  • Electronic devices exposed to broad thermal cycling (–65 to 200 °C).

  • Environments requiring easy inspection and repairability.

3. Typical Properties

Property Unit Value
Still Not Mixed (As Supplied)
Appearance Translucent, yellow-green
Nonvolatile Content % 61
Viscosity @ 25 °C cps 175
Tack-Free Time min 50
After Cured
Hardness Shore D 30
Tensile Strength psi 300
Elongation % 30
Dielectric Strength volts/mil 1100
Dielectric Constant @ 100 Hz 2.54
Dielectric Constant @ 100 kHz 2.51
Dissipation Factor @ 100 Hz 0.00220
Dissipation Factor @ 100 kHz 0.00097
Volume Resistivity ohm·cm 1.0 × 10¹³
Usable Temperature Range °C –65 to 200
Cure Time (0.5 mm, RT) min ~70 (40 min with DC-176 additive)
Heat Cure 15 min RT + 10 min at 70–80 °C
Shelf Life months 6 (≤25 °C, unopened)

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