Everything about Vulkollan wheels and rollers
In which hardness (Shore A) can Vulkollan ® be produced?
The standard production firmnesses Konijnenburg delivers his Vulkollan wheels in 90° and 95° Shore A. For specific applications, there are also productions of Vulkollan in 80° Shore A. Rubbers: 25-80° Shore A.
Plastics: 55-95° Shore D.
The optimal properties of Vulkollan be realized with a hardness of 90° Shore A. Vulkollan 95° shore A offers the advantage of a greater load-bearing capacity (about 15% higher than at 90° Shore A), whereas Vulkollan® 80° Shore A may offer a solution where a better grip is required on the running surface.
What is the tensile strength of Vulkollan® compared to other materials?
Vulkollan has a large elongation high tensile strength + + a high degree of rigidity. Vulkollan® 90° Shore A can be pulled out its initial length to nearly seven times.
Plastics and metals: high tensile strength + high rigidity, but small elongation, and a very small elasticity.
Rubbers: large extension but small + small tensile stiffness.
How resistant is Vulkollan® to tearing?
Vulkollan® has very good crack resistance. Moreover, it is also the tear resistance at notch very good. Although lower than when not carved, the tear resistance according to the scale of Graves is unmatched by any non-reinforced elastomer. Vulkollan is insensitive to cutting damage and even when the coating has been damaged, the material breaks down does not go out and thus remains functional.
At what temperatures can Vulkollan® be used?
Vulkollan® remains elastic and shock absorbing to -40°C. At temperatures up to ca 125°C occurs, with the exception of the elasticity modulus of a reversible reduction of most of the properties. The resistance to tearing, and thereby also the wear resistance, are greatly reduced at temperatures above 80°C. At temperatures above 125°C enter a permanent damage of the chemical structure.
Vulkollan® has a longer life than rubber?
Vulkollan® has an exceptionally good abrasion resistance and up to 2 times less volume loss due to wear than natural rubber. Softer Vulkollan® often has lower wear than the harder because the Vulkollan® can deflect. To maintain optimum wear resistance, the temperature should not rise too high.
How strong is the bond with Vulkollan®?
Konijnenburg has a special surface treatment that achieves an optimal chemical adhesion to all metal surfaces (cast iron, steel, aluminum, stainless steel, ...) We guarantee at room temperature and chemically neutral environment as great adhesion of the Vulkollan® to the metal as its own tensile strength of the Vulkollan®.
Vulkollan® can be edited after it is poured and polymerized?
Vulkollan® can still be edited, but it should be taken into account with the elastic characteristics of the material. Konijnenburg disposes of experienced technical people who Vulkollan® run smoothly, milling and drilling.
What are the effects of environmental influences on the quality?
The natural color of Vulkollan® is tan. Under the influence of UV light is Vulkollan® dark to black by the Desmodur 15. Color changes, even uneven, do not affect the quality.
Problem of hydrolysis. What can be done about it?
Hydrolysis is the decomposition of polyurethanes by contact with (hot) water. In hot and humid environments degradation by hydrolysis can be slowed by adding STABAXOL the Vulkollan®.
Problem of the flat side of a prolonged stoppage under load. What about Vulkollan®?
Vulkollan has a very small permanent deformation as compared to other polyurethanes. Thus wheels Vulkollan® have the least suffer from "flat sides", also called the Monday sole.
Vulkollan is an insulator or a conductor?
Vulkollan is an insulator. After extensive research Vulkoprin they however also managed to develop an electrically conductive Vulkollan wheel. This Vulkollan C has also almost the same features as the standard Vulkollan, but has an electrical resistance which is significantly lower than 10 ^ 4 Ohm (standard for the term "electrically conductive" use). Vulkollan C is produced in black (non-marking!), As is customary in the industry for anti-static wheels (electrical resistance between 10 ^ 5 to 10 ^ 7 ohm) or electrically conductive (resistivity <10 ^ 4 ohm) wheels.