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Smooth-On / Material reference
Polyurethane

Smooth-Cast™ 305

Smooth-Cast™ 305 is listed by Smooth-On as a polyurethane casting resin. The source reports mixed viscosity of 80 cps, mix ratio by weight of 100A:90B, pot life of 7 minutes. This record connects 18 reported fields with 16 manufacturer document links. Review the original technical data sheet for the applicable test conditions and processing instructions.

Technical data sheet Safety data sheet
80 cpsManufacturer-reported
100A:90BManufacturer-reported
7 minutesManufacturer-reported
30 minutesManufacturer-reported
70Manufacturer-reported
1.05 g/ccManufacturer-reported

Technical & safety documents

16 links
Files open on the manufacturer's document host. Region and language follow the source listing; confirm the revision inside the file.
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TDS
Technical BulletinEnglish · Not specified
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TDS
Ficha Técnica en EspañolSpanish · Not specified
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SDS
Smooth-Cast 305 SDS | EnglishEnglish · United States & Canada
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SDS
Smooth-Cast 305 SDS | SpanishSpanish · United States & Canada
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SDS
Smooth-Cast 305 SDS | FrenchFrench · United States & Canada
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SDS
Smooth-Cast 305 SDS | EnglishEnglish · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | SpanishSpanish · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | FrenchFrench · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | GermanGerman · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | ItalianItalian · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | GreekGreek · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | DutchDutch · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | PolishPolish · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | CzechCzech · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | HungarianHungarian · United Kingdom & European Union
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SDS
Smooth-Cast 305 SDS | NorwegianNorwegian · United Kingdom & European Union
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Reported specifications

18 fields
Material and processing data
PropertyReported valueEvidence
Mixed Viscosity80 cpsManufacturer table
ColorWhiteManufacturer table
Mix Ratio By Volume1A:1BManufacturer table
Mix Ratio By Weight100A:90BManufacturer table
Pot Life7 minutesManufacturer table
Cure Time30 minutesManufacturer table
Shore D Hardness70Manufacturer table
Specific Gravity1.05 g/ccManufacturer table
Specific Volume26.4 cu. in./lb.Manufacturer table
Compressive Strength3,800 psiManufacturer table
Elongation @ Break7.5 %Manufacturer table
Flexural Modulus118,000 psiManufacturer table
Flexural Strength4,000 psiManufacturer table
Heat Deflection Temp120 °FManufacturer table
Shrinkage0.0065 in./in.Manufacturer table
Tensile Modulus134,000 psiManufacturer table
Tensile Strength3,000 psiManufacturer table
Compressive Modulus44,900 psiManufacturer table
Reported values are not independent test results. Original units and table wording are preserved. Extracted TDS rows can depend on the grade, component and source table headings; use the linked page to verify that context. Test methods, sample preparation and cure schedules may differ; consult the original TDS before making a performance comparison.

Selection & processing checks

Distinguish rigid casting plastics, elastomeric rubbers and foams. Their density, hardness scales and processing requirements are not interchangeable.

  • Is this a solid material or an expanding foam?
  • Which hardness scale and cure conditions are reported?
  • What moisture-control and preparation steps does the manufacturer require?
  • Confirm the complete product designation, including any hardener, color or formulation suffix.
  • Read the current SDS for handling, protective equipment, storage and disposal information.

The reported weight ratio for this record is 100A:90B. A weight ratio must not be used as a volume ratio without the appropriate density information.

Missing properties are not estimated. Similar values or shared application labels do not establish a drop-in replacement.

Other materials in this family

View collection
Material / manufacturerFamilyKey specificationDocumentsAdd to comparison
Shell Shock™ FASTSmooth-OnPolyurethane3,000 cpsMixed Viscosity15 linked
Shell Shock™ SLOWSmooth-OnPolyurethane3,000 cpsMixed Viscosity15 linked
Smooth-Cast™ 300Smooth-OnPolyurethane80 cpsMixed Viscosity16 linked
Smooth-Cast™ 300QSmooth-OnPolyurethane80 cpsMixed Viscosity16 linked
Related records are browsing suggestions, not validated substitutes.