company tower banner
Silpak Company Logo

Silpak RU-440

Silpak RU-440 is a liquid, two-component, 100% solids Urethane Elastomer RTV that is easy to process. This system is offers good strength properties with excellent library shelf-life. Use to make molds or rubber parts. Molds are used to cast concrete, wax, and plaster parts.

Polymer Name: Polyurethane Thermoset Elastomer (unspecified)

Features: Easy Formulation, Enhanced Tear Resistant, Excellent Strength, High Elongation, Long Seal Life, Low Viscosity

Technical Data Sheet
  • TypeDocument Name
View All Documents

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Technologies

Features & Benefits

Unique Characteristics
  • Easy to Process
  • Low Viscosity for Capturing Detail
  • Excellent Strength Properties

Applications & Uses

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Color (Comp A)Yellow/Clear
Color (Comp B)Translucent Amber
Coverage27cu/in/lb
De-mold Time (Reactivity)16 – 24 hrs
Elongation 425%ASTM D-638
Gel Time (Reactivity)20min
Mix Ratio, by weight (Comp A)100
Mix Ratio, by weight (Comp B)50
Hardness40Shore A
Specific Gravity 1
Tear Resistance96pliASTM D-624
Tensile Strength355psiASTM D-638
Viscosity, Mixed3400cps

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.