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Silpak RU-280

Silpak RU-280 is a two-component, semi-flexible urethane elastomer that is easy to process. Applications include automotive, tooling, architectural flexible moldings, prototype, Special FX, coatings and any application where rapid cure, high resiliency, firm rubber part is required. Parts can be easily stained with either oil or water based paints.

Polymer Name: Polyurethane Thermoset Elastomer (unspecified)

End Uses: Prototyping, Tooling

Features: Easy Formulation, Easy To Modify, High Resilience

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Technologies

Features & Benefits

Unique Characteristics
  • Easy to Process
  • Fast Demold

Applications & Uses

Plastics & Elastomers End Uses
Applications

Applications include automotive, tooling, architectural flexible moldings, prototype, Special FX, coatings and any application where rapid cure, high resiliency, firm rubber part is required. Parts can be easily stained with either oil or water based paints.

Mixing & Curing Instructions

Measure out proper amounts of components, 1 part A to every 4 parts B, ensuring B component has been premixed prior to blending components together. Once blended, pour into silicone RTV mold and allow part to cure, 25-45 minutes, depending on thickness of part, temperature of materials and mold. If part is highly detailed, work material into the mold surface for best results. Parts can be easily stained with oil or water based paints. **Material will release from Silicone RTV mold surface, but release agent is suggested to pro-long mold life. The technique of applying ER 2300 spray mold release onto mold followed by a light dusting of mold with talc or like powder will help improve overall mold life.

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Color (Comp. A)Brown
Color (Comp. B)Off White
Coverage 20.85in3/lb
Elongation 150%ASTM D-638
De-mold Time (Reactivity)25-45 min
Gel Time (Reactivity)7min
Mix Ratio by Volume (Comp. A)18
Mix Ratio by Volume (Comp. B)82
Mix Ratio, by Weight (Comp. A)25
Mix Ratio, by Weight (Comp. B)100
Hardness80Shore A
Tear Resistance 280pliASTM D-624
Tensile Strength1300psiASTM D-638
Viscosity (Comp. A)300cps
Viscosity (Comp. B)1250cps

Packaging & Availability

Pacakaging
  • Quart Kit (3 lbs)
  • Gal Kit (10 lbs)
  • 5 Gal Kit (50 lbs)
  • 55Gallon Drum Kits

Storage & Handling

Storage

Storage RU 280 A/B is sensitive to cooler weather under 75°F and can begin crystallizing and solidifying. If material becomes lumpy and grainy due to cold weather, reheating material to 125° to 150°F will bring material back to original viscosity. Electric drum or pail heater will need to be used to avoid material problems. Call Technical support for further information.