Dow Silastic 591

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Description for Dow Silastic 591

Fast heat cure; low shrinkage; no cure by-products; low compression set.

Brand	Silastic
Application Type	Mold-Making
1 Part or 2 Part	2 Part
Material Form	Liquid
Manufacturer	Dow
Chemistry	Silicone rubber
Cure Method	Heat, Part A/Part B
Cure Temperature (°C)	171, 200
Cure Time (min)	Fast, 5.00, 0.13 to 0.23
Color	Off White
Key Specifications	UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1

Best Practices for Dow Silastic 591

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Technical Data for Dow Silastic 591

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Overview

Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Part A Name - Part A
- Part B Name - Part B
Material Form
- Liquid
Industry
- Textiles - Fabric coating
- Industrial - Business machine rollers, Sleeving
Chemistry
- Silicone - Silicone rubber
Application Method
- Dispenser - Meter mix equipment
Cure Method
- Heat
- 2-Part Cure - Part A/Part B
Color
- Off-White - Off White
Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: V-1 - UL 94 V-1
Brand
- Silastic

Specifications

Cure Specs

Cure Temperature (°C)	171, 200	Test Method
Cure Time (min)	Fast, 5.00, 0.13 to 0.23	Test Method
Linear Shrinkage (%)	Low
Mix Ratio	1:1 (by volume)

Bond Strength

Tear Strength (piw)	73 (ppi)	Test Method
Tensile Strength (psi)	485	Test Method

Hardness

Shore A Hardness	51	Test Method
Elongation (%)	4	Test Method

Other Properties

Specific Gravity	1.540	Test Method
Flash Point (°F)	212.0
% Solids (%)	100

Business Information

Shelf Life Details	When stored at or below 32°C (90°F) in the original, unopened containers this product has a usable life of 18 months from the date of production.
Shelf Life Type	from the date of production.
Shelf Life (mon)	18

Best Practices for Dow Silastic 591

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1. Mixing
  
  The A and B components are supplied strained and de-aired to be used as lot matched kits. Mix parts A and B in a 1:1 ratio. Meter mix equipment which pumps, meters and mixes the two components without the incorporation of air is strongly recommended for production.
2. Deairing/Degassing
  
  If air bubbles are entrapped during mixing the mixture must be thoroughly de-gassed under vacuum.
3. Curing
  
  SILASTIC 591 cures rapidly at elevated temperatures. A 2mm cross-section requires 8-14 seconds at 200°C (392°F). The cure time depends on the thickness and the cure temperature used. Cure can be inhibited by contact with certain materials such as amines, sulphur and tin complexes.
4. Clean-Up
  
  The uncured silicone can readily be removed by most hydrocarbon solvents. Polar solvents, such as ketones and alcohols, are not suitable.
Comparable Materials for Dow Silastic 591

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Spec Engine^® Results
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