Types of coating
Polyurethane / NBR / NBR/PVC /
SBR / EPDM / Silicone / NR /
HY / NE / EPDM/Silicone
DESSA-NV uses technologies with more than 150 types of rubber and polyurethane, which allows us to choose the type of coating that has the best performance properties for the customer's equipment.
Below is a table with the properties of the base polymers.
Behind each polymer name there are hundreds of recipes for rubber compounds and polyurethanes, which, after adding various ingredients, have unique physical and chemical properties that make them the best coating for each type of roller application.
Polyurethane
- Elasticity, abrasion resistance, high strength, high resistance to tearing and multiple deformations, ability to work at high pressure
NBR (nitrile-butadiene rubber)
- Resistant to oil-based solvents and mineral oils. Temperature range of application: -30°C to +80°C (briefly up to +100°C). At high temperatures, aging is accelerated, due to which the material becomes hard and brittle.
NBR/PVC (nitrile-butadiene rubber with PVC inclusion)
- NBR/PVC blends have very similar properties to NBR compounds, but with improved ozone resistance.
SBR (styrene-butadiene rubber)
- It is very flexible, so many manufacturers use it instead of natural rubber. SBR demonstrates very good mechanical resistance, especially to abrasion and tearing. Unfortunately, its disadvantage is poor resistance to oil and mineral-based substances, as well as to weather conditions.
EPDM
- It is a rubber based on ethylene and propylene. It has good wear resistance and excellent resistance to organic solvents, alcohols and hot water. Excellent resistance to ozone. Low temperature threshold. High tensile strength. Also resistant to non-flammable hydraulic fluids. Unstable to mineral oils.
Silicone
- It is used for shafts operating at temperatures up to 250°C. Limited chemical resistance properties.
NR (natural rubber)
- Good high temperature properties. Resistant to most hydrocarbons, acids, vegetable and animal oils. Poor for nitrogen-containing compounds, low molecular weight esters and ketones
HY (high-poly)
- Improved resistance to acids and ozone compared to neoprene. High colour fastness means it is suitable for certain bleaching agents. Poor resistance to esters and ketones, concentrated oxidising agents, chlorinated, aromatic and nitrocarbons.
NE (neoprene)
- Good resistance to heat and flame, ageing and weather. Moderate resistance to oil and chemicals. Long flex life. Poor resistance to aromatic hydrocarbons.
EPDM/Silicone
- Better heat resistance than EPDM. Better physical properties than plain EPDM.
- Our suppliers of rubber compounds have the ability to upgrade their compound recipes based on personalised customer requests, such as increasing chemical resistance to certain chemicals or adjusting certain physical properties.
- We can use special grades of rubber compounds: conductive, antistatic, porous, containing hydrophilic elements, glass, and Teflon. For food processing equipment, we offer food grade with enhanced cleaning that meets sanitary and hygienic requirements
