Dow Silastic 3498 Base / 98 Curing Agent

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Description for Dow Silastic 3498 Base / 98 Curing Agent

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

Brand	Silastic
Chemical Resistance	Excellent
Application Type	Mold-Making
1 Part or 2 Part	2-Part
Material Form	Liquid
Substrate	Porous substrates, Polyester resins, Rubber
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
High Temperature Resistance (°C)	Excellent

Best Practices for Dow Silastic 3498 Base / 98 Curing Agent

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Technical Data for Dow Silastic 3498 Base / 98 Curing Agent

*See Terms of Use Below

Overview

Chemical Resistance
- Chemical Resistance - Excellent
Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 2-Part
Material Form
- Liquid
Substrate
- Porous Substrates
- Rubber
- Polyester - Polyester resins
Industry
- Industrial - Art objects, Figurines
Chemistry
- Silicone
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

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.
Comparable Materials for Dow Silastic 3498 Base / 98 Curing Agent

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