Silpak RU-420

Silpak RU-420 is a two-component, 100% solids Urethane Elastomer RTV developed for its Softness (Low Durometer), High Flexibility and Elongation properties. This softer RTV provides High Stretch and High Tear Resistant properties that can be used for making molds or rubber parts. Molds are used to cast concrete, plaster and wax parts.

Polymer Name: Polyurethane Thermoset Elastomer (unspecified)

Processing Methods: Casting

End Uses: Industrial Castings, Molds/Dies/Tools, Power/Other Tools

Features: Enhanced Tear Resistant, Excellent Flexibility, Good Elongation, Low Viscosity, Soft

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Technologies

Features & Benefits

Unique Characteristics
  • High Stretch and Tear Resistance Properties
  • Low Viscosity for Improved Detail Definition
  • Low Durometer for easier demolding of highly undercut parts

Applications & Uses

Plastics & Elastomers Processing Methods

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Color (Comp A)Yellow/Clear
Color (Comp B)White
De-mold Time (Reactivity)16 – 24 hrs
Gel Time (Reactivity)20min
Mix Ratio by weight (Comp A)50
Mix Ratio by weight (Comp B)100
Viscosity (Comp A)2000cps
Viscosity (Comp B)1000cps
Viscosity Mixed (Comp A)800cps

Safety & Health

Handling and Safety

Use proper equipment—gloves, glasses and apron when using materials. Avoid direct contact with skin and eyes. If skin contact occurs, clean area with waterless hand cleaner or isopropyl alcohol. For eye contact, flush eye with water for 15 minutes and call physician. Use materials under adequate ventilation.

Packaging & Availability

Pacakaging
  • Quart Kit (3 lbs)
  • Gal Kit (12 lbs)
  • 5 Gal Kit (60 lbs)

Storage & Handling

Storage/ Shelf Life

A and B components must be stored in their original, unopened containers at temperatures between 65F and 85F. Shelf life of materials when kept in unopened sealed containers, at the recommended storage conditions, is 6 months. Containers should not be opened until ready for use. Once containers are opened, material should be used in a short time period. Pre-test any aged material before using. Molds or parts should be cleaned with a soap solution and completely dried prior to storing them in a dry, cool environment. Avoid stacking or exposing them to environmental elements—UV and moisture.