PT Flex 60 is a polyurethane rubber with Shore A60 hardness and exceptional resistance to tearing, abrasion and impact. Its low viscosity makes casting easy, its 1:1 mix ratio by weight and volume simplifies workshop work, and the result is a flexible, stable part with a translucent amber finish. Free from phthalates, mercury and MOCA.
Technical specifications
Parameter
Value
Application
Casting
Color
Amber
Shore Hardness
A60
Mix ratio (weight)
100A : 100B
Mix ratio (volume)
100A : 100B
Pot life
5 min
Cure time
2 hours
Maximum service temperature
60 °C
Phthalates / Mercury / MOCA
Free from
What it is used for
PT Flex 60 is aimed at the manufacture of parts that need to absorb impacts, withstand continuous friction or maintain their shape under repeated loads. Its medium-high hardness within the flexible range makes it a solid choice for industrial and special effects applications:
Manufacture of wheels, rollers and parts subject to abrasion
Silent blocks, anti-vibration mounts and damping elements
Props and display pieces with a translucent amber finish
Workshop tooling, shims and flexible clamping elements
Reproductions and replicas with high wear resistance
Secondary moulds for short runs on resistant models
How to use it
Prepare the mould or surface. Make sure the mould is clean, dry and free of residue from previous cures. Apply a suitable release agent for polyurethane to all surfaces that will come into contact with the material.
Condition the components. Bring the part A and part B containers to workshop temperature (20–25 °C). Stir or agitate each component separately before mixing, as they may settle on standing.
Weigh or measure the parts. Mix part A and part B in a 1:1 ratio by weight or by volume. The equivalence simplifies the process: you can use precision scales or graduated cups.
Mix decisively. Combine both parts for 60–90 seconds, scraping the walls and bottom of the container thoroughly. The pot life is only 5 minutes, so work quickly.
Add pigment if needed. If you want to colour the part, add a few drops of PolyColor Dyes to the mixture before casting. They are compatible and do not affect the cure.
Pour into the mould. Cast the material in a thin, continuous stream to help air escape. Fill from the lowest point upwards whenever possible.
Cure time. Leave undisturbed for at least 2 hours at room temperature. After this time the part can be demoulded.
Demould and post-cure if necessary. For high-performance mechanical applications, a post-cure at moderate temperature (not exceeding 60 °C) can improve final properties.
Important notice — Two-component polyurethanes
Polyurethane rubbers are moisture-sensitive. Part A (isocyanate) can gel if exposed to humid air for extended periods. Always close containers immediately after each use and store them in a dry place. If the material shows lumps or crystallisation, do not use it: the cure may be compromised. Work in an environment with a stable temperature; cold slows the cure and excessive heat accelerates it unevenly.
Usage tips
Managing pot life
With only 5 minutes of pot life, planning is key. Have the mould ready and the release agent applied before you start mixing. For large castings or complex parts, divide the mix into smaller batches or work with two people: one mixes while the other casts. Do not try to extend the pot life by adding more of one of the components; this alters the mechanical properties of the cure.
Temperature and humidity in the workshop
The ideal working temperature is between 20 and 25 °C. Below 18 °C the material becomes more viscous, mixing is harder and the cure slows down. Above 30 °C the pot life shortens even further. Avoid working in environments with relative humidity above 70 %: the isocyanate (part A) reacts with water vapour and can generate bubbles or alter the cure.
Colouring and finishes
PT Flex 60 accepts colouring with PolyColor Dyes, Feroca's special pigments for polyurethane. Add the pigment to part B before mixing with part A to ensure even dispersion. Do not exceed 3–5 % of the total weight of the mixture to avoid compromising the mechanical properties. Standard paste pigments are also compatible provided they are formulated for polyurethane resins.
Frequently asked questions
How much heat can this polyurethane rubber withstand?
PT Flex 60 should not exceed 60 °C in service. Above that temperature the mechanical properties degrade and the part may deform permanently. For applications with higher thermal exposure, consult other references in the Feroca catalogue.
Do I need a release agent when working with this rubber?
Yes, it is always recommended to apply a suitable release agent for polyurethane to the mould before casting. Polyurethane tends to adhere to porous surfaces and some plastics. The release agent ensures clean demoulding and extends the service life of the mould.
Can I use pigments with this rubber?
Yes. PolyColor Dyes and paste pigments formulated for polyurethane resins are fully compatible with PT Flex 60. Add the pigment to part B before mixing with part A for even dispersion.
Is it suitable for making silent blocks or damping mounts?
PT Flex 60 is one of the recommended options for this type of application thanks to its Shore A60 hardness and excellent impact and tear resistance. For more demanding damping applications, also consider PT Flex 85, which has higher hardness.
Can it be laminated with carbon fibre or fibreglass?
It is not recommended. Reinforcement fabrics such as carbon fibre or fibreglass are designed to work with rigid materials. In a flexible rubber like PT Flex 60 they provide no structural advantage and adhesion between the fabric and the flexible matrix is problematic. For rigid reinforced parts, consult rigid polyurethane resins such as Feropur PR55+E55.
What should I do if the material has gelled inside the container?
Gelling of part A (isocyanate) is caused by exposure to ambient moisture. A gelled material cannot be used: the cure will be incomplete and the mechanical properties will not be correct. To prevent this, always close containers immediately after each use and store them in a dry place. If the product shows lumps or has increased noticeably in viscosity, discard it.
Can I mix by volume or is weighing mandatory?
PT Flex 60 has a 1:1 ratio by both weight and volume, which gives flexibility in the process. You can use graduated cups or scales depending on what you have available. In any case, accuracy in measurement is important: an incorrect ratio directly affects the cure and the final properties of the rubber.
How does this rubber differ from a rigid polyurethane resin?
PT Flex 60 is an elastomer: once cured it is flexible, absorbs impacts and recovers after deformation. A rigid resin like Feropur PR55+E55 offers structural rigidity, greater hardness and is suitable for parts that must not deform. The choice depends on whether the final part needs flexibility or rigidity.
Video tutorial
🎥 Feroca TutoReel: Create a concrete mould cast with urethane 😍💪
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