Cervellati srl is one of the few Italian companies endowed with the Bayer license to manufacture in Vulkollan®, which is a polyurethane elastomer that achieves exceptional performances under dynamic strains and against corrosive agents. Vulkollan® has a base of 1.5-naphthalen-diisocyanate (Desmodur 15), polyester polyhydric alcohol and special chain extenders.

Cervellati works with Vulkollan® employing a high-tech solution, the hot-casting moulding, and manufacturing both semi-finished and customized items based on the customer’s specifications. Cervellati guarantees highly close relationships with its customers, assistance and support during every phase of the deal.  To view all the technical applications of Vulkollan®, please, see the list on the right.

Furthermore, we suggest you to take a look to our Vulkollan® product range, semi-finished articles and customized items. 

Technical Features

The unique quality of Vulkollan® is proved by the following technical features:

- outstanding resistance to very tough conditions: high temperatures,
  exceptional loads, contact with chemical substances, grease and oils;
- no need of specific tests: the material’s reactions can be expected
  for every application;
- endurance to UV rays and ozone;
- minimal permanent deformation due to compression;
- minimal dynamic rigidity;
- high tear resistance;
- resilience upon impact;
- low heat accumulation à great power transmission capacity;
- virtually no flattening;
- high elasticity;
- high compressibility/compactability.

Compact Vulkollan, chemical and electrical characteristics      

Polyester-based Vulkollan is subject to the impact of hot water, bases and acids, in a process known as hydrolysis. In organic solvents, there is a significant degree of swelling, and as swelling increases, the mechanical properties are compromised. The solvents responsible for swelling the material physically can be removed later from the elastomer through a drying process. Many plastics contain non-fixed additives, such as plasticizers, which can be extracted by washing, through the contact with solvents, with consequent alteration of the material. Vulkollan contains no plasticizers, and modifications of its characteristics following the extraction of the non-fixed additives have not been noted. 

The material's features, as a result, are completely predictable.

The effect of compression

The loading and release curves resulting by tracing the lines characteristic of elasticity define a zone noted as loss due to hysteresis. The loading and release curves in Vulkollan are closely aligned, denoting a very low loss of energy. This characteristic is highly advantageous in the event the material is subject to repeated dynamic stresses for a long period of time.

 

Characteristics of elasticity at different temperatures         

Compressive deformation curves exhibit Vulkollan's exceptional thermal stability, with characteristics of elasticity differing only minimally between 0°C and 80°C.
For project designers, this offers the possibility of predicting deformation, it being virtually constant, on a wide range of temperatures. This is an important requirement for the safe and reliable performance of the material.