Dow Silastic 3498 Base / 98 Curing Agent

Dow Silastic 3498 Base / 98 Curing Agent Datasheet
  • Description for Dow Silastic 3498 Base / 98 Curing Agent

    High tear strength, low durometer, very good resistance to polyester resin.

    *See Terms of Use Below

    Brand Silastic
    Application Type Mold-Making
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate Polyester resins, Rubber, Porous substrates
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Curing Agent
    Cure Temperature (°C) 20 to 25, 23, 23
    Cure Time (min) 10,080, 1,440
    Viscosity (cPs) 12,400
    Chemical Resistance Excellent
    High Temperature Resistance (°C) Excellent
  • Technical Data for Dow Silastic 3498 Base / 98 Curing Agent

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
      • Part A Name - Base
      • Part B Name - Curing Agent
    • Material Form
      • Liquid
    • Substrate
    • Industry
    • Chemistry
    • Cure Method
      • 2-Part Cure - Curing Agent
    • Brand
      • Silastic
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 23, 23
    Cure Time (min) 10,080, 1,440
    Viscosity (cPs) 12,400
    Linear Shrinkage (%) 0.70 Test Method
    Work / Pot Time (min) Long, 122
    Thixotropic High
    Mix Ratio 10:1 (by volume), 100:10 (by weight)
    Bond Strength
    General Bond Strength (psi) High
    Tear Strength (piw) 145 (ppi), High, Tear Resistance Test Method
    Tensile Strength (psi) 536 (Cp) Test Method
    Material Resistance
    Chemical Resistance Excellent
    High Temperature Resistance (°C) Excellent
    Hardness
    Shore A Hardness 27 Test Method
    Elongation (%) 310, 316 Test Method
    Flexibility Flexible
    Other Properties
    Specific Gravity 1.240, 0.970 Test Method
    Flash Point (°F) 107.6
    Business Information
    Shelf Life Details When stored at or below 32°C (89.6°F) in the original unopened containers, SILASTIC 3496, 3497 or 3498 have a usable life of 12 months from the date of production., SILASTIC 96 and 98 have a usable life of 12 months from the date of production.
    Shelf Life Type from the date of production
    Shelf Life (mon) 12
  • Best Practices for Dow Silastic 3498 Base / 98 Curing Agent

    *See Terms of Use Below

    1. Surface Preparation

      The surface of the original should be clean and free of loose material. If necessary, and in particular with porous substrates, use a suitable release agent such as petroleum jelly or soap solution.

    2. Mixing

      Thoroughly stir SILASTIC 3496, 3497 or 3498 Base before use, as filler separation may occur upon prolonged storage. Weigh 100 parts of SILASTIC 3496 or 3497 Base and 10 parts SILASTIC 96 Curing Agent into a clean container. Likewise weigh 100 parts of SILASTIC 3498 and 10 parts SILASTIC 98 Curing Agent into a clean container. Mix together until the curing agent is completely dispersed in the base. Hand or mechanical mixing can be used, but do not mix for an extended period of time or allow the temperature to exceed 35°C (95°F). Mix suitable small quantities to ensure thorough mixing of base and curing agent.

    3. Deairing/Degassing

      It is strongly recommended that entrapped air be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. After a further 1-2 minutes under vacuum, the mix should be inspected and if free of air bubbles, can then be used. A volume increase of 3-5 times will occur on vacuum de-airing the mixture, so a suitably large container should be chosen.

      Caution: prolonged vacuum will remove volatile components from the mix and may result in poor thick section cure and non-typical properties.

      Note: If no vacuum de-airing equipment is available, air entrapment can be minimized by mixing a small quantity of base and curing agent, then using a brush, painting the original with a thin layer. Leave at room temperature until the surface is bubble free and the layer has begun to cure. Mix a further quantity of base and curing agent and proceed as follows to produce a final mold.

    4. Curing

      Pour the mixed base and curing agent as soon as possible onto the original, avoiding air entrapment. The catalyzed material will cure to a flexible rubber and the mold can then be removed. If the working temperature is significantly lower than 23°C(73.4°F), the cure time will be longer. If the room temperature or humidity is very high, the working time of the catalyzed mixture will be reduced. The final mechanical properties will be reached within 7 days.

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    *See Terms of Use Below

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Linear Shrinkage Test Methods
Linear Shrinkage Test Method Temp
0.70 % Cured for 7 days at 23°C (73°F) 23°C
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature
145 (ppi) 10,080 min 23°C
High
Tear Resistance
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature
536 (Cp) 10,080 min 23°C
Elongation Test Methods
Elongation Test Method
310 % Elongation Test Method
316 % Elongation at break, Cured for 7 days at 23°C (73°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
27 Cured for 7 days at 23°C (73°F) 23°C
Specific Gravity Test Methods
Specific Gravity Temperature
1.240 25°C
0.970 25°C