VFI®-2133 35 A TDI Molding Rubber

VFI-2133 35 A TDI Molding Rubber is a 1:1, MOCA-free urethane rubber with high properties to make durable molds for casting. Urethane rubber is ideal for mold applications where a certain detailed shape, contour, or curve is desired. It captures and reproduces exact textures and fine details that will transfer over to cast parts. Compared to MDI rubbers, VFI-2133 has lower moisture sensitivity, lower exothermic reaction, and an extended pot life for easier processing and ample time to work with the material. VFI’s 2100 series rubbers have inherent chemical strength and high properties to achieve more pulls from a single mold. With a workable viscosity, it removes trapped air and fills all necessary cavities without the use of a vacuum chamber or pressure pot. The standard color of VFI-2133 is blue, but a neutral color (VFI-2134) is available.

VFI-2133 35 A TDI Molding Rubber from VFI is a MOCA-free, long-lasting urethane rubber used to make durable, detailed molds for casting concrete.

Features & Benefits

  • Captures excellent detail and texture for high-quality, repeatable results
  • Increased rebound properties allow for easier demolding and less stress on the cast part
  • Workable viscosity reduces air bubbles and fills in voids
  • Superior physical properties ideal for cast and manufactured stone molds, and formliners
  • Improved strength for better abrasion resistance and longer-lasting molds
  • Decreased moisture sensitivity for extended working time
  • Outperforms when casting pigmented and colored concrete
  • Consistent results in large- or small-scale applications

Instructions for Use:

Mold Preparation

All surfaces should be clean and free of oils, dirt, or debris. Use a non-hardening sulfur-free clay on molds to prevent unwanted adhesion and improper cure. Porous surfaces such as natural stone, wood, or concrete must be properly sealed for ease of demolding. VFI recommends using a mixture of 80% mineral spirits to 20% petroleum jelly by weight as a sealer. Apply several layers of the mixture with a small chip brush, waiting for each layer to dry before adding another. After sealing, spray a light misting of a release agent over the entire molding surface to prevent unwanted adhesion. We recommend using Chem-Trend MR0515 Aerosol or a similar release agent.

Non-porous surfaces only require the use of a release agent. Using a release agent helps to protect and extend the life of the mold. Avoid spraying too much release, as this can produce a shiny/glossy surface on the rubber that will transfer to future castings. The material is compatible with most molds as long as it is used with a proper release agent.

Mixing

The material should be at least 65°F before use for proper mixing and application. Mixing times may vary depending on volume and mixing method. Vacuum degassing can further reduce air entrapment but is not required.

  • Premix the B side (Poly) until uniform before combining it with the A side (Iso). Mix slowly to minimize air entrapment.
  • Check the technical data sheet for the proper mix ratio by weight or volume and calculate the material needed on both sides.
  • Measure the A side into a clean mixing container.
  • Follow by measuring and adding the B side material into the same container.
  • Mix until uniform. Power mixing or meter mixing equipment is recommended for quantities over 1 gallon. Scrape the bottom and sides of the container to ensure a uniform mix is achieved.
  • Transfer to a new container and mix again before use. It must be fully mixed and poured before the end of the pot life.

Molding Process

Pour the material into a single spot at the lowest point of the mold until the desired thickness is met. VFI recommends pouring at a minimum of ¾ of an inch thick. If pouring less than ¾ of an inch thick, we recommend using a higher shore A hardness scale rubber. Allow the rubber to sit at room temperature for a minimum of 16 hours before demolding. The rubber will develop full physical properties after 7 days at room temperature. It is required that the rubber sits for 3 days at room temperature before use. If the cured rubber is used for casting, a release agent should be applied before each use.

Safety

*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

This product contains isocyanate, which can irritate the skin and is toxic if inhaled as particulate matter. Avoid prolonged breathing of vapors and repeated skin contact. It is not UV color stable and has no long-term UV testing. Urethanes are moisture sensitive and may bubble if exposed to too much moisture.

  • 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 reaction 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:

  • Pour

Available Packaging:

  • Tote
  • Drum
  • 5 Gallon
  • 1 Gallon

Physical Properties

  • Hardness Shore A: 35
  • Tensile Strength: 650 psi
  • Elongation: 1600%
  • Tear Strength: 75 pli
  • Dimensional Stability: <0.001 in/in

Liquid Properties

  • Specific Volume: 26.9 in3/lb
  • Mixed Liquid Density: 8.59 lbs/gal
  • Mixed Specific Gravity: 1.03 g/ml
  • Ratio by Volume (A:B): 1A:1B
  • Ratio by Weight (A:B): 100A:100B
  • Mixed Solids by Volume: 100%
  • Viscosity A Side: 1700 cps
  • Viscosity B Side: 1500 cps
  • Mixed Viscosity: 1500 cps
  • Pot Life: 20 mins
  • De-mold Time: 16 hours
  • Place into Service: 72 hours
  • VOC: 0 g/L

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