PMC™-770

770x ⓘ E3A7F4DB-0D43-1540-A1E3-E7B54511B510
Polyurethane Elastomer

This two-part, tough, flexible, and abrasion-resistant mold or casting urethane rubber is ideal for industrial molds.

  • Mix Ratio: 2A:1B  by Weight
  • Working time: 30 minutes
  • Cure Time: 16 hours
  • Shore Hardness: 70 A
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.
€ 340.62

(€ 281.50 without 21% VAT)

In stock

Description

This two-component urethane rubber cures at room temperature, forming a tough, flexible, and abrasion-resistant mold or casting material. 

With a Shore A hardness of 70, PMC™-770 provides excellent tear strength, making it suitable for industrial production molds and tooling where durability is crucial.

  • Mix Ratio By Weight 2A:1B
  • Working time: 30 minutes
  • Cure Time: 16 hours
  • Shore Hardness: 70 A
  • Specific Gravity: 1.04 g/cc
  • Specific Volume: 0.96 cm3/g.
  • Color: Light Amber
  • Tensile Strength: 51.7 bar
  • 100% Modulus: 1723.75 kPa
  • Elongation@Break: 750 %
  • Die C Tear Strength: 35.0 kN/m
  • Shrinkage <.001 in. / in.
  • Mixed Viscosity: 3,000 cps

Instructions

Preparation

  • Use products promptly due to limited shelf life. Store and use at room temperature (23°C) with low humidity.
  • Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk. Ensure good ventilation.
Sealing Porous Materials
  • Seal porous models (gypsum, concrete, wood, stone) before applying a release agent. Use fast-drying sealers or high-quality shellac for sulfur or moisture-containing clays.
Non-Porous Surfaces
  • Metal, glass, hard plastics, and sulfur-free clays require only a release agent.
Applying a Release Agent
  • Use a mold-making release agent. Apply liberally and brush lightly with a soft brush. Follow with a light mist and let dry for 30 minutes.
Measuring & Mixing
  • Liquid urethanes absorb moisture. Use clean metal or plastic tools. Pre-mix Part B before use. Mix Parts A and B thoroughly for at least 3 minutes, scraping sides and bottom.
  • For large quantities (11 kg+), use a mechanical mixer for 3 minutes, then hand mix for 1 minute. Pour into a new container and repeat mixing.
  • Vacuum degassing or pressure casting can reduce air bubbles.
Pouring
  • Pour in a single spot at the lowest point, allowing rubber to flow over the model. Ensure at least 1.3 cm of rubber over the highest point.
Curing
  • Allow to cure for at least 16 hours at 23°C. Do not cure below 18°C. Use mild heat or a cure accelerator to reduce cure time.
Post Curing
  • Heat cured rubber to 65°C for 4-8 hours to enhance properties.
Using the Mold
  • Apply a release agent before each casting. Use appropriate agents for wax, liquid rubber, or thermosetting materials.
  • For gypsum, sponge mold with soap solution for better flow and release. Use a water-based release concentrate for abrasive materials like concrete.
Performance & Storage
  • Fully cured rubber is durable. Contact the manufacturer for application-specific inquiries.

Specifications

Hundred Percent Modulus 250 psi
Color Light Amber
Mixed Viscocity 3,000 cps
Cure Time 16 hours
Pot Life 30 minutes
Specific Volume 26.5 cu. in./lb.
Die C Tear Strength 200 pli
Specific Gravity 1.04 g/cc
Mix Ratio By Weight 2A:1B
Shrinkage <.001 in. / in.
Tensile Strength 750 psi
Elongation At Break 750 %
Shore A Hardness 70
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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