Smooth-Cast™ 310

cast310pint ⓘ 3019A5DB-E205-5F4A-AA3E-1BC33D0990F6
Polyurethane Resin

High-performance casting resin with excellent detail reproduction. Slow curing, extended pot-life

  • Shore hardness: 70 D
  • Working time: 20 minutes
  • Demold time: 4 hours
  • Mix ratio: 1:1 by weight
  • Low viscosity for easy mixing
exclamation.svg health-hazard.svg

Danger

H315 - Causes skin irritation.
H317 - May cause an allergic skin reaction.
H320 -
H332 - Harmful if inhaled.
H334 - May cause allergy or asthma symptoms or breathing difficulties if inhaled.
€ 26.21

(€ 21.66 without 21% VAT)

In stock

Description

This casting resin is part of a series known for ultra-low viscosity and bright white, bubble-free castings. 

Smooth-Cast™ 310 does not require vacuum degassing. The resin can be mixed using a 1A:1B ratio by volume or 100A:90B by weight. Differences in the series include pot life and demold time.

Smooth-Cast™ 310 accepts fillers such as URE-FIL™ 3 and can be colored with SO-Strong™ or Ignite™ tints. Fully cured castings are tough, durable, machinable, and paintable, with resistance to moisture and mild solvents.

Applications include reproducing small to medium sculptures, making prototype models, special effect props, and decorative jewelry.

  • Shore hardness: 70D
  • Working time: 20 minutes
  • Demold time: 4 hours
  • Mix ratio: 1:1 by weight
  • Low viscosity for easy mixing
  • Elongation at Break: 7.5%

Instructions

Safety

  • Store and use materials in a warm environment (23°C).
  • Use products promptly due to limited shelf life.
  • Liquid urethanes are moisture sensitive; use clean metal, glass, or plastic tools and containers.
  • Mix in a well-ventilated area. Wear safety glasses, long sleeves, and rubber gloves.
Applying A Release Agent
  • Use a mold-specific release agent (e.g., Universal™ Mold Release).
  • Apply a liberal coat on all surfaces contacting the plastic.
  • Brush with a soft brush, apply a light mist, and let dry for 30 minutes.
  • Release agents prolong mold life; silicone molds may not need them unless casting silicone.
Measuring & Mixing
  • Store and use materials at 23°C.
  • Stir or shake Parts A & B before dispensing. Mix equal parts by volume or 100A:90B by weight.
  • Scrape the sides and bottom of the mixing container thoroughly.
Pouring
  • Pour mixture at the lowest point to minimize air entrapment.
  • For best results, use pressure casting at 60 PSI (4.2 kg/cm²) during cure time.
Curing
  • Ensure adequate ventilation; avoid inhaling fumes.
  • Let castings cool to room temperature before handling.
  • Demold time varies by mass and mold configuration; cures in 2-4 hours.
Post Cure
  • For full cure, allow room temperature cure followed by 4-6 hours at 65°C.
Performance
  • Cured castings are rigid, moisture-resistant, and machinable.
  • Remove any release agent before painting or bonding.
  • Unpainted castings may yellow over time, especially in UV light.
  • Conduct a small test application to ensure material suitability.

Specifications

Color White
Mixed Viscocity 80 cps
Cure Time 4 hours
Pot Life 20 minutes
Flexural Strength 4,000 psi
Flexural Modulus 118,000 psi
Specific Volume 26.4 cu. in./lb.
Specific Gravity 1.05 g/cc
Mix Ratio By Weight 100A:90B
Shrinkage 0.0065 in. / in.
Mix Ratio By Volume 1A:1B
Tensile Strength 3,000 psi
Elongation At Break 7.5 %
Shore D Hardness 70
Heat Deflection Temp 120 °F
Compressive Strength 3,800 psi
Tensile Modulus 134,000 psi
Compressive Modulus 44,900 psi
Available in Polyurethane Resin
Product Cure Time Specific Gravity Specific Volume Tensile Strength Tensile Modulus Compressive Strength Compressive Modulus Flexural Strength Shrinkage Heat Deflection Temp Elongation At Break Flexural Modulus Mixed Viscocity Mix Ratio By Volume Mix Ratio By Weight Pot Life Shore D Hardness Color Mixed Viscocity Cure Time Pot Life Flexural Strength Flexural Modulus Specific Volume Specific Gravity Mix Ratio By Weight Shrinkage Mix Ratio By Volume Tensile Strength Elongation At Break Shore D Hardness Heat Deflection Temp Compressive Strength Tensile Modulus Compressive Modulus
Smooth-Cast™ 300Q 5 min. 1.05 g/cc 26.4 cu. in./lb. 3,000 psi 139,500 psi 4,000 psi 45,800 psi 4,510 psi 0.01 in. / in. 120 °F 5 % 128,000 psi 80 cps 1A:1B 100A:90B 30 sec. 70 White 80 cps 5 min. 30 sec. 4,510 psi 128,000 psi 26.4 cu. in./lb. 1.05 g/cc 100A:90B 0.01 in. / in. 1A:1B 3,000 psi 5 % 70 120 °F 4,000 psi 139,500 psi 45,800 psi
Smooth-Cast™ 300 10 min. 1.05 g/cc 26.4 cu. in./lb. 3,000 psi 139,500 psi 4,000 psi 45,800 psi 4,510 psi 0.01 in. / in. 120 °F 5 % 128,000 psi 80 cps 1A:1B 100A:90B 3 min. 70 White 80 cps 10 min. 3 min. 4,510 psi 128,000 psi 26.4 cu. in./lb. 1.05 g/cc 100A:90B 0.01 in. / in. 1A:1B 3,000 psi 5 % 70 120 °F 4,000 psi 139,500 psi 45,800 psi
Smooth-Cast™ 305 30 min. 1.05 g/cc 26.4 cu. in./lb. 3,000 psi 134,000 psi 3,800 psi 44,900 psi 4,000 psi 0.0065 in. / in. 120 °F 7.5 % 118,000 psi 80 cps 1A:1B 100A:90B 7 min. 70 White 80 cps 30 min. 7 min. 4,000 psi 118,000 psi 26.4 cu. in./lb. 1.05 g/cc 100A:90B 0.0065 in. / in. 1A:1B 3,000 psi 7.5 % 70 120 °F 3,800 psi 134,000 psi 44,900 psi
Smooth-Cast™ 310 4 h. 1.05 g/cc 26.4 cu. in./lb. 3,000 psi 134,000 psi 3,800 psi 44,900 psi 4,000 psi 0.0065 in. / in. 120 °F 7.5 % 118,000 psi 80 cps 1A:1B 100A:90B 20 min. 70 White 80 cps 4 h. 20 min. 4,000 psi 118,000 psi 26.4 cu. in./lb. 1.05 g/cc 100A:90B 0.0065 in. / in. 1A:1B 3,000 psi 7.5 % 70 120 °F 3,800 psi 134,000 psi 44,900 psi
Smooth-Cast™ 385 2 h. 1.60 g/cc 17.3 cu. in./lb. 3,100 psi 400,000 psi 8,500 psi 400,000 psi 5,900 psi 0.0006 in. / in. 135 °F 1 % 433,000 psi 3,000 cps - 1A:5B 20 min. 85 Beige 3,000 cps 2 h. 20 min. 5,900 psi 433,000 psi 17.3 cu. in./lb. 1.60 g/cc 1A:5B 0.0006 in. / in. - 3,100 psi 1 % 85 135 °F 8,500 psi 400,000 psi 400,000 psi

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