Manufacturing a high-quality industrial shaft is not just about applying a rubber layer. The most important stage that determines the durability, strength and elasticity of the coating is vulcanisation. At Dessa-NV, we use professional equipment and proven technologies adapted to each type of rubber compound.
🌡 What is vulcanisation?
It is a process of heat treatment of rubber with the addition of sulphur or other agents that changes its structure: rubber becomes more resistant to deformation, temperature, chemistry and mechanical stress.
After vulcanisation, the shaft is cured:
- stable shape
- elasticity without "floating"
- increased wear resistance
- resistance to delamination and cracks
🏭 What vulcanisation methods we use
🔹 Autoclave vulcanisation
- Temperature: +150...+180 °C
- Pressure: 6-12 bar
- Duration: from 30 minutes to several hours
- Used for most rubbers (NBR, EPDM, SBR, HNBR)
The advantage: maximum uniformity and depth of curing
🔹 Continuous vulcanisation
- For products made of polyurethane or heat-resistant silicone coatings
- Fast cycle times with low layer thicknesses
- Relevant for mass production or urgent orders
🛑 What happens if you break the technology
Insufficient vulcanisation - the rubber will be soft, sticky, and will not withstand loads
Over-vulcanisation - the material will become brittle and lose adhesion
Violation of the operating conditions - possible cracks, delamination, deformation during operation
🧪 How we control quality
- Determination of hardness (Shore A)
- Control of firmness and elasticity
- Checking the geometry after curing
- Adhesion test (rubber detachment from the rod)
Advantages of vulcanisation at Dessa-NV LLC
- In-house autoclave - precise temperature and pressure control
- Dependent technology for each mix
- Possibility to repair poorly vulcanised shafts from other manufacturers
- Guarantee of stable coating quality
📩 Need a shaft that can withstand tens of thousands of cycles? We weld rubber to metal properly and it will last for years.
