Dow Sylgard 528 Firm Gel Parts A & B

Dow Sylgard 528 Firm Gel Parts A & B Datasheet
  • Description for Dow Sylgard 528 Firm Gel Parts A & B

    Firm or tough, thermal/mechanical shock and vibration damping, primerless chemical adhesion at room temperature (except 3-4237 Dielectric Firm Gel, which requires heat to develop chemical adhesion), excellent dielectric properties, flexible cure schedule, reversion resistant, thick section cure, compatible with automated dispensing equipment, and physical and electrical stability over a wide temperature range.

    *See Terms of Use Below

    Brand Sylgard
    Application Type Seal
    1 Part or 2 Part 2 Part
    Material Form Gel
    Industry Circuits, E-Mobility Solutions, Smart Meters, Smart Home Devices, Electronics, Optoelectronics
    Manufacturer Dow
    Chemistry Silicone, Solvent-free
    Cure Method Part A/Part B, Heat
    Cure Temperature (°C) 20 to 25, 120
    Cure Time (min) 80
    Viscosity (cPs) Low, 400
    Color Clear
    High Temperature Resistance (°C) 150
    Low Temperature Resistance (°C) -45, -55
    Durability Tough
    Light Refractive Index (RI) High
  • Technical Data for Dow Sylgard 528 Firm Gel Parts A & B

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
    • Material Form
      • Gel
    • Industry
      • E-Mobility Solutions
      • Electronics - Circuits, Optoelectronics
      • Smart Meters
      • Smart Home Devices
    • Application Method
      • Dispenser - Automated dispensing equipment
    • Cure Method
      • Heat
      • 2-Part Cure - Part A/Part B
    • Color
      • Clear / Transparent - Clear
    • Brand
      • Sylgard
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 120
    Cure Time (min) 80
    Viscosity (cPs) Low, 400
    Work / Pot Time (min) 360, Long Test Method
    Mix Ratio 1:1 (by volume)
    Material Resistance
    High Temperature Resistance (°C) 150
    Low Temperature Resistance (°C) -45, -55
    Moisture/Humidity Resistance Moisture/humidity resistance
    Conductivity
    Dielectric Strength (V/mil) Excellent
    Hardness
    Durability Tough
    Flexibility Firm, Resilient, Flexible
    Other Properties
    Light Refractive Index (RI) High
    Specific Gravity 0.970 Test Method
    Business Information
    Shelf Life Details Storage conditions and shelf life (“Use By” date) are indicated on the product label.
    Shelf Life Temperature (°F) 77
    Shelf Life (mon) 9
  • Best Practices for Dow Sylgard 528 Firm Gel Parts A & B

    *See Terms of Use Below

    1. Mixing

      Some gels are supplied in bladder packs that avoid direct air contact with the liquid gel components, allowing use of air pressure over the pack in a pressure pot for dispensing. Do not apply air pressure directly to the liquid gel surface (without the bladder pack) as the gel can become supersaturated with air and bubbling can occur when the material is dispensed and cured. Use of bladder packs prevents bubbling, maintains cleanliness and avoids gel contamination. In general, gels are supplied as two-part products that are mixed in a 1:1 ratio (Parts A and B)

      one-part gels are available that eliminate the need for mixing. Gels can be dispensed manually or by using one of the available types of meter mix equipment. Typically, the two components are of matched viscosities and are readily mixed with static or dynamic mixers, with automated meter-mix normally used for high volume processes. For low-volume applications, manual weighing and simple hand mixing may be appropriate. Inaccurate proportioning or inadequate mixing may cause localized or widespread problems affecting the gel properties or cure characteristics. If possible, the potential for entrapment and incorporation of gas (typically air) should be considered during design of the part and selection of a process to mix and dispense the gel. This is especially important with higher-viscosity and faster-curing gels. Degassing at >28 inches (10-20 mm) Hg vacuum may be necessary to ensure a void-free, protective layer.

    2. Testing

      If a substrate or material is questionable with respect to potentially causing inhibition of cure, it is recommended that a small scale compatibility test be run to ascertain suitability in a given application. The presence of liquid or uncured product at the interface between the questionable substrate and the cured gel indicates incompatibility and inhibition of cure.

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Work / Pot Time Test Methods
Work / Pot Time Temperature
360 min 25°C
Long
Specific Gravity Test Methods
Specific Gravity Test Method
0.970 Cured or uncured A & B.