PMC™-780 WET

780Wetx ⓘ 542F4FFB-A726-7F4A-BFFF-33ED414F2D61
Polyurethane Elastomer

Durable, tough, flexible, and abrasion-resistant urethane rubber with built-in release agent.

  • Mix Ratio: 2A:1B (weight or volume)
  • Working time: 25 minutes
  • Cure Time: 48 hours
  • Shore Hardness: 80 A
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Warning

H302 - Harmful if swallowed.
H312 - Harmful in contact with skin.
H315 - Causes skin irritation.
H319 - Causes serious eye irritation.
H332 - Harmful if inhaled.
€ 321.35

(€ 265.58 without 21% VAT)

In stock

Description

This two-part urethane rubber cures at room temperature, forming a tough, flexible, and abrasion-resistant material with a Shore A hardness of 80. PMC™-780 WET is suitable for demanding production molds, form liners, and industrial parts.

  • Mix Ratio By Volume: 2A:1B
  • Mix Ratio By Weight: 2A:1B
  • Working time: 25 minutes
  • Cure Time: 48 hours
  • Shore Hardness: 80 A
  • Specific Gravity: 1.02 g/cc
  • Specific Volume: 0.98 cm3/g .
  • Color: Light Amber
  • Tensile Strength: 62.1 bar
  • 100% Modulus: 2758 kPa
  • Elongation@Break: 750 %
  • Die C Tear Strength: 35.03 kN/m
  • Shrinkage <.001 in. / in.
  • Mixed Viscosity: 2,000 cps

Instructions

Preparation

  • This product has a limited shelf life and should be used promptly.
  • Store and use materials at room temperature (23°C) with low humidity.
  • Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk.
  • Ensure good ventilation in the workspace.

Sealing Porous Materials

  • Models made of porous materials (gypsum plasters, concrete, wood, stone, etc.) must be sealed before applying a release agent.
  • Use SuperSeal™ or One Step™ from Form X for fast drying without interfering with surface detail. Sonite™ Wax or high-quality Shellac is suitable for sealing modeling clays containing sulfur or moisture.
  • Allow the sealing agent to dry completely before applying a release agent.

Non-Porous Surfaces

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

Applying A Release Agent

  • A release agent is necessary for demolding when casting into or over most surfaces. Use a release agent specifically for mold making (e.g., Universal™ Mold Release from Form X).
  • Apply a liberal coat of release agent to all surfaces that will contact the rubber.
  • Lightly brush the release agent with a soft brush over all surfaces, follow with a light mist coating, and let it dry for 30 minutes.

Important Notes

  • Conduct a small test application to determine suitability for your project.
  • Shelf life is reduced after opening. Replace lids immediately after dispensing to prolong shelf life.
  • XTEND-IT™ Dry Gas Blanket from Form X can significantly prolong the shelf life of unused liquid urethane products.

Measuring & Mixing

  • Liquid urethanes are moisture sensitive. Use clean metal or plastic mixing tools and containers.
  • Pre-mix Part B before use. Mix Parts A and B thoroughly for at least 3 minutes, scraping the sides and bottom of the container.
  • For large quantities (11 kg or more), use a mechanical mixer for 3 minutes, then hand mix for one minute. Pour into a new container and repeat.

Pouring

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

Curing

  • Allow the mold to cure for at least 48 hours at 23°C before demolding.
  • Do not cure rubber below 18°C. Cure time can be reduced with mild heat or Smooth-On “Kick-It™” Cure Accelerator.

Post Curing

  • After curing at room temperature, heating the rubber to 65°C for 4 to 8 hours will enhance physical properties and performance.

Using The Mold

  • Apply a release agent to the mold before each casting. The type depends on the material being cast.
  • For gypsum plaster, sponge the mold with a soap solution for better flow and release. In & Out™ II Water Based Release Concentrate from Form X is recommended for abrasive materials like concrete.

Performance & Storage

  • Fully cured rubber is tough and durable. Proper use and storage ensure optimal performance.
  • Contact FORM X for questions about this material relative to your application.

Specifications

Hundred Percent Modulus 400 psi
Color Light Amber
Mixed Viscocity 2,000 cps
Cure Time 48 hours
Pot Life 25 minutes
Specific Volume 27.2 cu. in./lb.
Die C Tear Strength 200 pli
Specific Gravity 1.02 g/cc
Mix Ratio By Weight 2A:1B
Shrinkage <.001 in. / in.
Mix Ratio By Volume 2A:1B
Tensile Strength 900 psi
Elongation At Break 750 %
Shore A Hardness 80
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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