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Smooth-On / Material reference
Polyurethane

Smooth-Cast™ ONYX™ SLOW

Smooth-Cast™ ONYX™ SLOW is listed by Smooth-On as a polyurethane casting resin. The source reports mixed viscosity of 100 cps, mix ratio by weight of 120A:100B, pot life of 5 minutes. This record connects 18 reported fields with 15 manufacturer document links. Review the original technical data sheet for the applicable test conditions and processing instructions.

Technical data sheet Safety data sheet
100 cpsManufacturer-reported
120A:100BManufacturer-reported
5 minutesManufacturer-reported
90 minutesManufacturer-reported
80Manufacturer-reported
1.09 g/ccManufacturer-reported

Technical & safety documents

15 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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SDS
Smooth-Cast ONYX SLOW SDS | EnglishEnglish · United States & Canada
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SDS
Smooth-Cast ONYX SLOW SDS | SpanishSpanish · United States & Canada
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SDS
Smooth-Cast ONYX SLOW SDS | FrenchFrench · United States & Canada
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SDS
Smooth-Cast ONYX SLOW SDS | EnglishEnglish · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | SpanishSpanish · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | FrenchFrench · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | GermanGerman · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | ItalianItalian · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | GreekGreek · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | DutchDutch · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | PolishPolish · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | CzechCzech · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | HungarianHungarian · United Kingdom & European Union
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SDS
Smooth-Cast ONYX SLOW SDS | NorwegianNorwegian · United Kingdom & European Union
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Reported specifications

18 fields
Material and processing data
PropertyReported valueEvidence
Mixed Viscosity100 cpsManufacturer table
ColorBlackManufacturer table
Mix Ratio By Volume100A:100BManufacturer table
Mix Ratio By Weight120A:100BManufacturer table
Pot Life5 minutesManufacturer table
Cure Time90 minutesManufacturer table
Shore D Hardness80Manufacturer table
Specific Gravity1.09 g/ccManufacturer table
Specific Volume27.7 cu. in./lb.Manufacturer table
Compressive Strength11,400 psiManufacturer table
Elongation @ Break3 %Manufacturer table
Flexural Modulus286,000 psiManufacturer table
Flexural Strength10,230 psiManufacturer table
Heat Deflection With Post Cure212 °FManufacturer table
Shrinkage0.012 in./in.Manufacturer table
Tensile Modulus374,000 psiManufacturer table
Tensile Strength7,660 psiManufacturer table
Compressive Modulus97,900 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 120A:100B. 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.