VFI®-3070 70 A Polyurethane Casting Rubber

VFI®-3070 70 A Polyurethane Casting Rubber

VFI-3070 70 A Polyurethane Casting Rubber is a fast-setting urethane rubber that can be injected or poured into molds to make repeatable parts and castings. Its 1:1 mix ratio provides easy processing, while its fast gel time allows for quick demolding of parts. With excellent physical properties, you can create many different high-end castings that offer high durability and impact resistance. VFI-3070 works well in urethane, platinum silicone, or metal molds and can produce parts of varying sizes that maintain final properties.

VFI-3070 70 A Polyurethane Casting Rubber from VFI is a urethane rubber with a fast gel time for quick demolding of durable and impact resistant parts.

Features & Benefits

  • Superior physical properties for industrial part making and prototyping
  • Room temperature cure with no need for post curing
  • Highly durable urethane rubber with great rebound and versatility
  • Economical alternative to high amine-based rubbers (VFI-176)
  • Fast setting with quick demold times for increased part production

Instructions for Use:

Mold Preparation

Clean the surface of any oils, dirt, debris, or other contaminants. Ensure all surfaces in contact with VFI-3070 are sealed and coated with a release agent to prevent unwanted adhesion when demolding. A release agent is required to protect and extend the life of the mold. Compatible molds for casting VFI-3070 include urethane, metal, and platinum silicone when properly prepared.

Molding Process

As a two-component material, the B side (Poly) must be premixed until uniform before combining it with the A side (Iso). With a short work time, the recommended application is to inject the material, but small amounts can be hand poured if done quickly. If you are not injecting, the B side must be poured into the A side and mixed thoroughly with a power mixer until uniform. The material must be fully mixed and used before the duration of the pot life.

VFI recommends pouring at a minimum of ¼ of an inch thick in non-heated molds. Allow the material to cure for a minimum of 10 minutes at room temperature before demolding. Full physical properties can be achieved after 3 days at room temperature. Post-curing the material at 150°F for 2 hours will allow you to obtain full properties sooner. Thin pours may require a longer cure time to be able to demold.


*Always read the safety data sheet before working with chemicals  

Use chemicals only as directed and for their intended purpose. Do not dispose of chemicals down the drain. Most chemicals must be disposed of as hazardous waste.

PPE to avoid all unnecessary exposure:

  • Eye protection – wear approved safety glasses and any additional eye protection as necessary
  • Hand protection – wear chemically resistant protective gloves (nitrile, butyl, or neoprene)
  • Skin and body protection – wear suitable protective clothing
  • Respiratory protection – in case of insufficient ventilation, wear suitable respiratory equipment. Respirator selection must be based on known or anticipated exposure levels, the hazards of the product, and the safe working limits of the selected respirator

Product Limitations

VFI-3070 is not UV color stable and has no long-term UV testing. The A side contains isocyanate, which can be irritating to the skin and toxic if inhaled as particulate matter. Avoid prolonged breathing of vapors and repeated skin contact.

  • Incompatible materials – A side: water, alcohols, amines, bases, and acids. B side: oxidizers
  • Conditions to avoid – heat and incompatible materials
  • Chemical stability – stable under normal storage conditions
  • Reactivity & hazardous reactions – no dangerous reactions known under normal use
  • Hazardous decomposition products – A side: carbon monoxide, carbon dioxide, nitrogen oxides, hydrocarbons, and HCN. B side: may include, and are not limited to, oxides of carbon

Potential Health Hazards

  • May cause respiratory tract irritation. A side material may also cause allergy and asthma symptoms or breathing difficulties if inhaled.
  • Causes skin irritation and sensitization: redness, edema, drying, defatting, and cracking of the skin. Repeated exposure to the B side material can result in absorption through the skin, causing a significant health hazard.
  • Causes serious eye irritation: discomfort, pain, excess blinking and tear production, marked redness, and swelling of the conjunctiva.
  • May cause stomach distress, nausea, or vomiting if swallowed.

*If you are experiencing any of these symptoms, seek medical advice or attention. Call a poison control center or doctor if swallowed.

Application Methods:

  • Chip Brush Chip Brush
  • Inject Inject
  • Pour Pour

Available Packaging:

  • Tote
  • Drum
  • 5 Gallon
  • 1 Gallon