Archives: Perguntas

NDI is the abbreviation of Naphthalene Diisocyanate It is one of the Raw Materials used for the manufacture of Vulkollan.

Additives are loads which can be added to polyurethanes in order to adjust its properties as required.

The hardnesses of Elastomers (polyurethanes) are measured in “Shore A” and “Shore D”. Shore Hardness is the measure which measures the resistance of the material according to the penetration of the needle of a durometer over a defined force. It is determined by numbers from 0 to 100 in scales A or D. The higher […]

It is the aging of certain types of polyurethanes to the time, attack of fungi and microbes. (there are correct manners for the storage of polyurethane parts and minimization of this problem. For more information contact our Technical Department).

It is the phenomenon where the development and accumulation of heat generated by action of mechanical work, excess of load or high speed, cause the build-up of a bubble concentrated inside the polyurethane layer.

They are the characteristic properties of each material, determined by its: Hardness, compression/traction module, tensile strength, elongation at break and the resistance to tearing.

Resilience, elasticity, resistance to the abrasion, low deformation, resistance to aging and others.

It is the resistance to oils and solvents, observed after immersion periods, calculating the loss of original properties and the variations of volume related to the initial properties.