PMC™-746

746xx ⓘ 4429B7C7-410D-224D-BB8F-F08E39327702
Polyurethane Elastomer

Two-component urethane rubber for flexible, durable molds.

  • Shore hardness: 30A
  • Mix ratio: 2A:1B by volume/weight
  • Working time: 15 min, cure time 16 hrs
  • Specific gravity: 1.03 g/cc
  • Elongation at break: 650%
exclamation.svg health-hazard.svg

Warning

H302 - Harmful if swallowed.
H312 - Harmful in contact with skin.
H332 - Harmful if inhaled.
H315 - Causes skin irritation.
H319 - Causes serious eye irritation.
€ 1,112.20

(€ 919.17 without 21% VAT)

In stock

Description

This two-component urethane rubber cures at room temperature and is designed for creating flexible, durable molds. 

PMC™-746 features a Shore A hardness of 30, providing flexibility and elongation, ideal for molds requiring high stretch and easy demolding from complex patterns or deep undercuts.

Specifications

  • Mix Ratio By Volume: 2A:1B
  • Mix Ratio By Weight: 2A:1B
  • Pot Life: 15 minutes
  • Cure Time: 16 hours
  • Shore Hardness: 60 A
  • Specific Gravity: 1.03 g/cc
  • Specific Volume: 0.97 cm³/g
  • Color: Ranges From Amber To Blue
  • Tensile Strength: 48.3 bar
  • 100% Modulus: 15.6 bar
  • Elongation at Break: 650%
  • Die C Tear Strength: 17.8 kN/m
  • Shrinkage: < 0.001 mm/mm
  • Mixed Viscosity: 1,200 mPa·s

Ideal for industrial, architectural, and artistic applications, it provides a balance of flexibility, strength, and reliability for professionals seeking long-lasting, precision molds.

Instructions

Preparation

  • Store and use at room temperature (23°C). Keep environmental humidity low.
  • Ensure good ventilation. Use the product promptly due to limited shelf life.
  • Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk.

Sealing Materials

  • Porous materials (gypsum, concrete, wood, stone) must be sealed before applying a release agent. Use SuperSeal™ or One Step™ sealers.
  • Shellac is suitable for modeling clays containing sulfur or moisture. Thermoplastics require sealing with shellac or PVA.
  • Allow the sealing agent to dry completely before applying a release agent.

Non-Porous Surfaces

  • Metal, glass, hard plastics, and sulfur-free clays only require a release agent.

Applying a Release Agent

  • Use a mold-specific release agent (e.g., Universal™ Mold Release). Apply liberally to all contact surfaces.
  • Brush lightly with a soft brush for thorough coverage, then mist lightly and let dry for 30 minutes.

Measuring & Mixing

  • Liquid urethanes are moisture-sensitive. Use clean metal, glass, or plastic tools and containers.
  • Pre-mix Part B before use. Mix two Parts A and one Part B thoroughly for at least 3 minutes, scraping sides and bottom.
  • For large quantities (7 kg or more), use a mechanical mixer for 3 minutes, followed by hand mixing.
  • Vacuum degassing can reduce air bubbles, though not always necessary.

Pouring

  • Pour mixture at the lowest point of the containment field to minimize air entrapment. Ensure the rubber levels at least 1.3 cm above the model's highest point.

Curing

  • Allow to cure for at least 16 hours at 23°C before demolding. Cure time can be reduced with mild heat or a cure accelerator.
  • Post-cure by heating to 65°C for 4 to 8 hours to enhance properties.

Using the Mold

  • Apply a release agent to the mold before each casting. The type depends on the material being cast.
  • For gypsum plaster, use a soap solution for better flow and release.

Performance & Storage

  • Fully cured rubber is durable. Proper use and storage affect its lifespan.

Specifications

Hundred Percent Modulus 220 psi
Color Ranges From Amber To Blue
Mixed Viscocity 1,200 cps
Cure Time 16 hours
Pot Life 15 minutes
Specific Volume 26.9 cu. in./lb.
Die C Tear Strength 100 pli
Specific Gravity 1.03 g/cc
Mix Ratio By Weight 2A:1B
Shrinkage < .001 in. / in.
Mix Ratio By Volume 2A:1B
Tensile Strength 700 psi
Elongation At Break 650 %
Shore A Hardness 60
Available in Polyurethane Elastomer
Product Cure Time Shore A Hardness Specific Gravity Specific Volume Tensile Strength Shrinkage Die C Tear Strength Elongation At Break Hundred Percent Modulus Mixed Viscocity Mix Ratio By Volume Mix Ratio By Weight Pot Life Hundred Percent Modulus Color Mixed Viscocity Cure Time Pot Life Specific Volume Die C Tear Strength Specific Gravity Mix Ratio By Weight Shrinkage Mix Ratio By Volume Tensile Strength Elongation At Break Shore A Hardness Operating Temperature Range Mix Ratio Mixed Viscosity 100% Modulus Color - PMC™-746 Color - PMC™-746 Clear Amber Post Cure Temperature
PMC™-121 30/WET 16 h. 30 1.04 g/cc 26.7 cu. in./lb. 400 psi < .001 in. / in. 75 pli 1,000 % 82 psi 1,800 cps 1A:1B 1A:1B 30 min. 82 psi Clear Amber 1,800 cps 16 h. 30 min. 26.7 cu. in./lb. 75 pli 1.04 g/cc 1A:1B < .001 in. / in. 1A:1B 400 psi 1,000 % 30 - - - - - - -
PMC™-746 Amber Clear - - - - - - - - - - - - - - - - 16 h. at 73°F/23°C 15 min. at 73°F/23°C 26.9 cu. in./lb. 100 pli 1.03 g/cc - < .001 in./in. - 700 psi 650% 60 Above 65°F/18°C 2A:1B by weight or volume 1,200 cps 220 psi Ranges From Amber To Blue Clear Amber 150°F/65°C for 4 to 8 h.
PMC™-746 16 h. 60 1.03 g/cc 26.9 cu. in./lb. 700 psi < .001 in. / in. 100 pli 650 % 220 psi 1,200 cps 2A:1B 2A:1B 15 min. 220 psi Ranges From Amber To Blue 1,200 cps 16 h. 15 min. 26.9 cu. in./lb. 100 pli 1.03 g/cc 2A:1B < .001 in. / in. 2A:1B 700 psi 650 % 60 - - - - - - -
PMC™-121 30/DRY 16 h. 30 1.04 g/cc 26.7 cu. in./lb. 400 psi < .001 in. / in. 75 pli 1,000 % 82 psi 1,800 cps 1A:1B 1A:1B 30 min. 82 psi Clear Amber 1,800 cps 16 h. 30 min. 26.7 cu. in./lb. 75 pli 1.04 g/cc 1A:1B < .001 in. / in. 1A:1B 400 psi 1,000 % 30 - - - - - - -
PMC™-780 WET 48 h. 80 1.02 g/cc 27.2 cu. in./lb. 900 psi <.001 in. / in. 200 pli 750 % 400 psi 2,000 cps 2A:1B 2A:1B 25 min. 400 psi Light Amber 2,000 cps 48 h. 25 min. 27.2 cu. in./lb. 200 pli 1.02 g/cc 2A:1B <.001 in. / in. 2A:1B 900 psi 750 % 80 - - - - - - -
PMC™-780 DRY 48 h. 80 1.02 g/cc 27.2 cu. in./lb. 900 psi <.001 in. / in. 200 pli 750 % 400 psi 2,000 cps 2A:1B 2A:1B 25 min. 400 psi Light Amber 2,000 cps 48 h. 25 min. 27.2 cu. in./lb. 200 pli 1.02 g/cc 2A:1B <.001 in. / in. 2A:1B 900 psi 750 % 80 - - - - - - -
PMC™-790 48 h. 90 1.07 g/cc 25.9 cu. in./lb. 2,000 psi <.001 in. / in. 300 pli 550 % 640 psi 3,000 cps 2A:1B 2A:1B 20 min. 640 psi Clear Amber 3,000 cps 48 h. 20 min. 25.9 cu. in./lb. 300 pli 1.07 g/cc 2A:1B <.001 in. / in. 2A:1B 2,000 psi 550 % 90 - - - - - - -
PMC™-121 50/WET 16 h. 50 1.04 g/cc 26.7 cu. in./lb. 350 psi < .001 in. / in. 85 pli 500 % 82 psi 1,400 cps 1A:1B 1A:1B 30 min. 82 psi Clear Amber 1,400 cps 16 h. 30 min. 26.7 cu. in./lb. 85 pli 1.04 g/cc 1A:1B < .001 in. / in. 1A:1B 350 psi 500 % 50 - - - - - - -
PMC™-744 16 h. 44 1.01 g/cc 27.5 cu. in./lb. 300 psi < .001 in. / in. 90 pli 400 % 90 psi 3,400 cps 2A:1B 2A:1B 15 min. 90 psi Beige 3,400 cps 16 h. 15 min. 27.5 cu. in./lb. 90 pli 1.01 g/cc 2A:1B < .001 in. / in. 2A:1B 300 psi 400 % 44 - - - - - - -
PMC™-770 16 h. 70 1.04 g/cc 26.5 cu. in./lb. 750 psi <.001 in. / in. 200 pli 750 % 250 psi 3,000 cps - 2A:1B 30 min. 250 psi Light Amber 3,000 cps 16 h. 30 min. 26.5 cu. in./lb. 200 pli 1.04 g/cc 2A:1B <.001 in. / in. - 750 psi 750 % 70 - - - - - - -

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