SYLGARD 184 Hermetic silicone filler

1.474,13 zl PLN 1.551,72 zl PLN Save 77,59 zl PLN

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Cechy szczególne: Dobra przyczepność do wielu podłoży, Dobra wodoodporność, Dobra wytrzymałość dielektryczna, Klej/uszczelniacz dwuskładnikowy, Utwardzanie Acetoxy (Octowy), Wydajność w niskich temperaturach, Wydajność w wysokich temperatur., Wysoka przyczepność i adhezja

Niska temperatura: od -31°C do -50°C

Przemysł: Elektronika, Energetyczny,

Wysoka temperatura: +151°C do 200°C

SYLGARD™ 184 Silicone Elastomer

Seal made of silicone elastomer

Transparent Hermetic silicone potting fluid for electronics with good fire resistance, Two-component kit

Application:

  • Encapsulation of LED lighting
  • Power supplies
  • Connectors
  • Sensors
  • Industrial control
  • Transformers
  • Amplifiers
  • High voltage resistor kits
  • Relays
  • Glue/capsule for solar cells
  • glue of the guide beam to integrated circuits during processing

Features and Benefits:

  • Liquid
  • Cure at room temperature or hot
  • Good dielectric properties
  • Fast, versatile temperature-controlled curing processing
  • High transparency allows easy inspection of components
  • Flammability rating UL 94 V-1
  • UL 746C Recognition

Composition

  • two-piece
  • 10 to 1 mixing ratio
  • Polydimethylsiloxane elastomer

Description

Dow Silicone Sealant is supplied as two-part kits of 10 to 1 liquid components. When the liquid components are thoroughly mixed, the mixture cures to a flexible elastomer that is ideal for protecting electrical/PCB assembly applications. Dow silicone capsules cure without exotherm at a constant rate, regardless of section thickness or degree of closure.

Typical Properties

    Characteristic Unit Result
    One or two parts Two
    Color Colorless
    Viscosity (base) cP 5100
    Hardness medium stiffness 20A-50A
    PA 5.1
    Viscosity (mixed) cP 3500
    PA 3.5
    Thermal conductivity btu/hour foot °F 0.15
    W/m °K 0.27
    Specific gravity (cured) 1.03
    Working time at 25°C (life - hours) hours 1.5
    Curing time at 25°C hours 48
    Curing time at 100°C minutes 35
    Curing time at 125°C minutes 20
    Curing time at 150°C minutes 10
    Edge of hardness 43
    dielectric strength volts/miles 500
    kV/mm 19
    volume resistance ohm*cm 2.9E+14
    Dissipation factor at 100 Hz 0.00257
    Dissipation factor at 100kHz 0.00133
    Dielectric constant at 100 Hz 2.72
    Dielectric constant at 100 kHz 2.68
    Linear CTE (according to DMA) ppm/°C 340
    Tensile strength PSI 980
    MPa 6.7
    kg/cm2 69
    Refractive index @ 589nm 1.4118
    Refractive index @ 632.8nm 1.4225
    Refractive index @1321nm 1.4028
    Refractive index @ 1554nm 1.3997
    UL RTI rating °C 150

    Certifications and standards

    • MIL specification,
    • UL recognition


      How to use

      Application Methods

      • Automatic mixing and dispensing dosing
      • Manual mixing

      Mixing and venting

      The 10 to 1 mix ratio in which these products are supplied gives you one leeway to tailor modulus and hardness to your specific application and production line needs. Venting is not required in most cases.

      Substrate preparation

      In applications requiring adhesion, priming will be required for many silicone casings. For best results, the primer should be applied in a very thin, uniform layer and then wiped off after application. Once applied, it must be thoroughly cured before applying the silicone elastomer.

      Processing / Curing

      The thoroughly mixed Dow silicone capsule can be poured/dispensed directly into the container where it is to be cured. Where possible, pouring/dispensing should be done under vacuum, especially if the poured or encapsulated component has many small voids. If this technique cannot be used, the device should be emptied after pouring/dispensing the silicone capsule. Dow silicone casings can be cured at room temperature (25°C/77°F) or heat cured. Room temperature curing encapsulants can also be heat accelerated for faster curing.

      Lifetime and curing speed

      The curing reaction starts with the mixing process. Initially, curing is indicated by a gradual increase in viscosity, followed by gelation and conversion to a solid elastomer. Pot life is defined as the time required for the viscosity to double after mixing base and curing agent and is highly dependent on temperature and application. Please refer to the data table.

      Useful temperature ranges

      For most applications, silicone elastomers should operate in a temperature range of -45 to 200°C (-49 to 392°F) for long periods of time. However, at the ends of the spectrum, they should be properly tested for the specific end-use environment. For low temperature performance, thermal cycling to conditions such as -55°C (-67°F) may be possible, but performance of parts or assemblies should be verified.

      Compatibility

      Certain materials, chemicals, hardeners, and plasticizers may inhibit the curing of addition-curing gels. The most important are: organotin and other organometallic compounds, silicone rubber containing an organotin catalyst, sulphur, polysulfides, polysulphones or other sulfur-containing materials, unsaturated hydrocarbon plasticizers and some solder flux residues. If the substrate or material is in doubt as to its potential to inhibit curing, a small scale compatibility test is recommended to determine suitability for the application. The presence of a liquid or uncured product at the interface between the questionable substrate and the cured gel indicates non-compliance.

      Repair and removal

      In the manufacture of electrical devices and PCB layout assemblies, it is often desirable to salvage or salvage damaged or defective units.
      Dow silicone capsules can be selectively removed with relative ease. To remove silicone elastomers, simply cut with a sharp blade or knife and peel away and remove unwanted material from the area to be repaired. Sections of adhered elastomer are best removed from substrates and circuits by mechanical means such as scraping or rubbing and can be helped by using DOWSIL™ OS Fluids to swell the elastomer.