Smooth-Cast™ 325

Cast325EUxx ⓘ C4BD1D4F-B364-FA4E-9183-B9770728B380
Polyurethane Resin

Color-neutral urethane resin, part of the ColorMatch™ Series, designed to achieve accurate color representation or filler effects.

  • Mix ratio: 1A:1B by volume
  • Low viscosity
  • Demold time: 10 min to 2-4 hrs
  • Shore hardness: 72D
  • Working time: 2.5 min
exclamation.svg health-hazard.svg

Danger

H315 - Causes skin irritation.
H317 - May cause an allergic skin reaction.
H319 - Causes serious eye irritation.
H332 - Harmful if inhaled.
H334 - May cause allergy or asthma symptoms or breathing difficulties if inhaled.
€ 737.47

(€ 609.48 without 21% VAT)

Out of stock

Description

This urethane resin is part of the ColorMatch™ Series, designed for adding color pigments and fillers to achieve accurate color representation or filler effects. 

Smooth-Cast™ 325 is color-neutral, allowing small amounts of pigment to produce vivid colors using So-Strong™, UVO™, or Ignite™ pigments.

Features

  • 1A:1B mix ratio by volume
  • Very low viscosity
  • Demold times from 10 minutes to 2-4 hours, depending on product, mass, and mold configuration

Note: Large mass castings may become very hot and shrink more, depending on mold configuration. The resin readily accepts fillers like URE-FIL™ 3, making it suitable for marble and wood grain effects or simulating metal by adding bronze or brass powder.

Applications include creating pigmented prototype models, special effect props, sculptures, and decorative jewelry. 

The resin has a pot life of 2.5 minutes, a cure time of 10 minutes, and a Shore hardness of 72D. 

EU REACH-compliant.

Instructions

  • Mix at a 1A:1B ratio by volume until uniform. 
  • Add pigment or filler as needed and mix thoroughly. 
  • Pour immediately—working time is approximately 2.5 minutes. 
  • Use clean, dry molds. 
  • Do not disturb during cure. 
  • Demold in about 10 minutes, longer for larger casts. 
  • Avoid large mass pours to reduce heat buildup. 
  • Once cured, parts can be sanded or painted. 
  • Wear gloves and ensure proper ventilation.
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 the appropriate amounts by volume or 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.
Post Cure
  • Optional post-cure: Follow room temperature cure 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 Clear Amber
Mixed Viscocity 100 cps
Cure Time 10 minutes
Pot Life 2.5 minutes
Flexural Strength 3,690 psi
Flexural Modulus 101,000 psi
Specific Volume 25.9 cu. in./lb.
Specific Gravity 1.07 g/cc
Mix Ratio By Weight 115A:100B
Shrinkage 0.01 in. / in.
Mix Ratio By Volume 1A:1B
Tensile Strength 3,170 psi
Elongation At Break 10 %
Shore D Hardness 72
Heat Deflection Temp 120 °F
Compressive Strength 3,500 psi
Tensile Modulus 140,000 psi
Compressive Modulus 36,500 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™ 325 10 min. 1.07 g/cc 25.9 cu. in./lb. 3,170 psi 140,000 psi 3,500 psi 36,500 psi 3,690 psi 0.01 in. / in. 120 °F 10 % 101,000 psi 100 cps 1A:1B 115A:100B 2.5 min. 72 Clear Amber 100 cps 10 min. 2.5 min. 3,690 psi 101,000 psi 25.9 cu. in./lb. 1.07 g/cc 115A:100B 0.01 in. / in. 1A:1B 3,170 psi 10 % 72 120 °F 3,500 psi 140,000 psi 36,500 psi
Smooth-Cast™ 326 60 min. 1.07 g/cc 25.9 cu. in./lb. 3,170 psi 140,000 psi 3,080 psi 32,200 psi 3,100 psi 0.0075 in. / in. 120 °F 10 % 95,700 psi 100 cps 1A:1B 115A:100B 9 min. 72 Clear Amber 100 cps 60 min. 9 min. 3,100 psi 95,700 psi 25.9 cu. in./lb. 1.07 g/cc 115A:100B 0.0075 in. / in. 1A:1B 3,170 psi 10 % 72 120 °F 3,080 psi 140,000 psi 32,200 psi
Smooth-Cast™ 327 4 h. 1.07 g/cc 25.9 cu. in./lb. 3,170 psi 140,000 psi 3,080 psi 32,200 psi 3,100 psi 0.0075 in. / in. 120 °F 10 % 95,700 psi 100 cps 1A:1B 115A:100B 20 min. 72 Clear Amber 100 cps 4 h. 20 min. 3,100 psi 95,700 psi 25.9 cu. in./lb. 1.07 g/cc 115A:100B 0.0075 in. / in. 1A:1B 3,170 psi 10 % 72 120 °F 3,080 psi 140,000 psi 32,200 psi

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