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Thermal Management

Arathane 5750-A/B (LV) urethane conformal coating for insulating printed circuit boards and electronics, providing low outgassing performance.

  • Item Name: Arathane® 5750-A/B (LV)

  • Manufacturer: Huntsman Advanced Materials

  • Technologies: Two-component urethane conformal coating

  • Color: Part A – Amber liquid; Part B – Translucent liquid

  • Cure Type: Room or heat curing (25–125 °C)

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: 6 months

1. Product Overview

Arathane® 5750-A/B (LV) is a two-component, translucent, soft, repairable urethane conformal coating designed to insulate printed circuit boards (PCBs) and electronic components.

  • Low outgassing: suitable for outer space and high-vacuum environments.

  • Excellent reversion resistance under heat and humidity.

  • Complies with MIL-I-46058C and IPC CC 830 Amendment 1 Type UR Class 3.

  • Flammable, moisture-sensitive; requires careful handling and storage.


2. Applications

  • Protective conformal coating for PCBs and electronic assemblies.

  • Application methods: dip, spray, spread.

  • Suitable for environments requiring:

    • Low modulus and repairability.

    • Resistance to humidity, heat, and fungus.

    • Long-term insulation with minimal outgassing (space, high-vacuum systems).

3. Typical Properties

A. Before Mixing

Property Arathane 5750-A Arathane 5750-B (LV)
Appearance Amber liquid Translucent liquid
Viscosity (cPs) 50 600
Specific gravity (g/cm³) 1.21 0.92
Flash point (°C) 7 17
Percent solids (%) 90 ± 3 82 ± 3

B. Mixed System

Property Value
Mix ratio (by weight) 18 (Part A) : 100 (Part B)
Initial viscosity (cPs) ~550
Pot life at 25°C (100g) ~2 hours

C. Cure Schedules (for thin coatings on PCBs)

Temp (°C) Gelation (min) Tack-free (h) Full cure
25 120 24 h 7 days
65 45 2 h 9 h
100 25 1.5 h 4 h
125 15 1 h 2 h

D. Physical Properties

Property Value
Hardness Shore A 50
Tensile strength 350 psi (2.4 N/mm²)
Elongation 150%
Glass transition (Tg) < -70°C
Max continuous use temp 130°C
Flame resistance Self-extinguishing
Fungus resistance Non-nutrient
Flexibility No cracking/crazing

E. Outgassing Properties (10⁻⁶ Torr)

Property Value
Total mass loss (%) 0.41
Collected volatile condensable materials (%) 0.03

F. Electrical Properties

Property Value
Insulation resistance > 1 × 10¹⁵ Ω
Volume resistivity (25°C) 9.3 × 10¹⁵ Ω·cm
Volume resistivity (95°C) 2.0 × 10¹³ Ω·cm
Dielectric strength (3 mil / 0.075 mm) > 1,500 V/mil
Dielectric constant (25°C, 1 kHz) 2.5 (3.0 @100 kHz)
Dielectric constant (100°C, 1 kHz) 3.6 (3.2 @100 kHz)
Dissipation factor (25°C, 1 kHz) 0.022 (0.025 @100 kHz)
Dissipation factor (100°C, 1 kHz) 0.024 (0.027 @100 kHz)
Moisture resistance 8.2 × 10¹¹ Ω

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BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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