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Polyurethane

Smooth-Cast™ 385

Smooth-Cast™ 385 is listed by Smooth-On as a polyurethane casting resin. The source reports mixed viscosity of 3,000 cps, mix ratio by weight of 1A:5B, pot life of 20 minutes. This record connects 17 reported fields with 2 manufacturer document links. Review the original technical data sheet for the applicable test conditions and processing instructions.

Technical data sheet Safety data sheet
3,000 cpsManufacturer-reported
1A:5BManufacturer-reported
20 minutesManufacturer-reported
2 hoursManufacturer-reported
85Manufacturer-reported
1.60 g/ccManufacturer-reported

Technical & safety documents

2 links
Files open on the manufacturer's document host. Region and language follow the source listing; confirm the revision inside the file.
Open original PDF
TDS
Technical BulletinEnglish · Not specified
Open file
SDS
Smooth-Cast 385 SDS | EnglishEnglish · United States & Canada
Open file

Reported specifications

17 fields
Material and processing data
PropertyReported valueEvidence
Mixed Viscosity3,000 cpsManufacturer table
ColorBeigeManufacturer table
Mix Ratio By Weight1A:5BManufacturer table
Pot Life20 minutesManufacturer table
Cure Time2 hoursManufacturer table
Shore D Hardness85Manufacturer table
Specific Gravity1.60 g/ccManufacturer table
Specific Volume17.3 cu. in./lb.Manufacturer table
Compressive Strength8,500 psiManufacturer table
Elongation @ Break1 %Manufacturer table
Flexural Modulus433,000 psiManufacturer table
Flexural Strength5,900 psiManufacturer table
Heat Deflection Temp135 °FManufacturer table
Shrinkage0.0006 in./in.Manufacturer table
Tensile Modulus400,000 psiManufacturer table
Tensile Strength3,100 psiManufacturer table
Compressive Modulus400,000 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 1A:5B. 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.

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TASK™ 15Smooth-OnPolyurethane600 cpsMixed Viscosity15 linked
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