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Silpak RU-448

Silpak RU-448 is a two-component, 100% solids Urethane Elastomer RTV that is easily processed. This system provides semi-flexible, abrasion resistant rubber compound with good elongation for easier demolding. Use for creating molds and rubber parts, especially large molds where dimensional stability is required to avert distortion. Molds are used to cast cement, wax, and plaster parts.

Polymer Name: Polyurethane Thermoset Elastomer (unspecified)

Features: Abrasion Resistant, Dimensional Stability, Flexible, Good Elongation, Rapid Cycle Time

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Technologies

Features & Benefits

Unique Characteristics
  • 100% Solid Urethane
  • Easy to Process
  • Rapid Mold Cycle

Applications & Uses

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Color (Comp A)Yellow/Clear
Color (Comp B)Green
Coverage27CU/IN/LB
De-mold Time (Reactivity)44546hrs
Elongation 850%ASTM D-638
Gel Time (Reactivity)30min
Mix Ratio, By Weight (Comp A)100
Mix Ratio, By Weight (Comp B)100
Hardness45Shore D
Hardness45Shore A
Specific Gravity1.03
Tear Resistance103psiASTM D-624
Tensile Strength 425psiASTM D-638
Viscosity (Comp A)3500cps
Viscosity (Comp B)1000cps

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
  • Pint Kit (2 lbs)
  • Qrt Kit (4 lbs)
  • Gal Kit (16 lbs)
  • 5 Gal Kit (80 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.