VFI®-3171 70 A MDI Molding Rubber

VFI®-3171 70 A MDI Molding Rubber is a 70 A hardness urethane rubber that provides high durability and flexibility. With the ability to maintain a thin viscosity long into its pot life, VFI-3171 allows for intricate parts to be poured with consistently thin material and large parts to be poured quickly. Maintaining a low viscosity allows VFI-3171 Molding Rubber to dissipate air bubbles with and without vacuum degassing depending on application.

70 A MDI mold making rubber with a slow pot life for easier mixing and a low viscosity for easier pouring.

Application Methods:

  • Pour

Available Packaging:

  • Tote
  • Drum
  • 5 Gallon
  • 1 Gallon

Product Details

  • Product Color: Standard color available is green. A neutral color is available and is called 3173-70 A Polyurethane Rubber. For additional premium colors or color matching services contact Volatile Free, Inc.
  • UV Stability: This product is NOT UV color stable and has no long-term UV testing. For additional information contact Volatile Free, Inc.
  • Coverage/Thickness Requirement: Volatile Free, Inc. recommends a minimum of 3/8 of an inch thickness. Contact Volatile Free, Inc. for more thickness requirements and specifications.
  • Storage Stability/Shelf Life: 12-month shelf life from date of manufacture when stored and sealed in unopened containers between 40°F - 75°F. Opened containers may be resealed with a nitrogen purge, but shelf life will be significantly shortened. Material should be brought to a minimum temperature of 65°F before use.
  • Equipment: For specific instructions and equipment requirements, contact Volatile Free, Inc.
  • Surface Preparation: All surfaces should be cleaned, prepped and free of any oils, dirt or debris. To demold, material must be non-porous or sealed with a chemical sealant. A release agent should be used on all products intended to be demolded. Contact Volatile Free Inc. with any additional questions.
  • Mixing: Pre-mixing Poly (B) components until uniform is required before combining Poly (B) and Iso (A). If pouring material by hand pre-weighed poly (B) must be poured into pre-weighed Iso (A) and then mixed until uniform and transferred to a new container to mix until uniform again before use. Product must be fully mixed and used before the duration of the pot life. Mix times may vary depending on volume and mixing method, please contact Volatile Free, Inc. for more information on any specific mixing questions and requirements.
  • Material Application: Temperature should be between 50°F and 100°F when the product is being used. The pot life will shorten with any increases in temperature beyond 72°F. Ensure surfaces in contact with the material are properly sealed and released before mixing to prevent any unwanted adhesion. Contact Volatile Free, Inc. for more information on recommended release agents or sealants.
  • Primers: Contact Volatile Free, Inc. on any primer questions.
  • Cleanup: Preferred clean-up solvent is chemically dry mineral spirits or MEK. Please contact Volatile Free, Inc. for more information on clean-up of equipment and tools.
  • Thinning: Do not thin prior to application.
  • Precautions: Contains isocyanate that may be irritating to the skin and is toxic if inhaled as particulate matter. See Safety Data Sheet for complete safety data. Do not add any foreign material to this product. Avoid prolonged breathing of vapors and prolonged or repeated skin contact. Use only with adequate ventilation.

VFI®-3171 70 A MDI Molding Rubber Physical Properties

  • Hardness Shore A (ASTM B-2240): 70
  • Hardness Shore D (ASTM B-2240): n/a
  • Tensile Strenth (ASTM D-412): 1100 psi
  • Elongation (ASTM D-412): 670.00%
  • Tear Strength (ASTM D-624): 135 pli
  • Solid Material Density : 26.04 (in3/lb)
  • Dimensional Stability: <0.001%

VFI®-3171 70 A MDI Molding Rubber Liquid Properties

  • Solids by Weight (ASTM D 1644): 100.00%
  • Solids by Volume (ASTM D2697): 100.00%
  • Liquid Density A Side (ASTM D 2939): 9.49 lbs/gal
  • Liquid Density B Side (ASTM D 2939): 8.68 lbs/gal
  • Mixed Liquid Density (ASTM D 2939): 8.86 lbs/gal
  • Specific Gravity A side: 1.14 g/ml
  • Specific Gravity B side: 1.04 g/ml
  • Specific Gravity Mixed: 1.07 g/ml
  • Ratio by Volume (A:B): 1A:2B
  • Ratio by Weight (A:B): 100 A : 182.58 B
  • Solids by Volume A side (ASTM D2697): 100.00%
  • Solids by Volume B side (ASTM D2697): 100.00%
  • Mixed Solids By Volume (ASTM D2697): 100.00%
  • Viscosity A side (ASTM D2196): 550 cps
  • Viscosity B Side (ASTM D2196): 925 cps
  • Mixed Viscosity : 800 cps
  • Pot Life: 30 min
  • De-mold Time: 16 hours


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Product Data Sheets