Greater stability. Less risk. Longer service life.
Through controlled expansion during impregnation or in the pre-drying phase, the material adapts precisely to its surroundings. Voids are reliably filled, components are securely fixed in place, and insulation systems are sustainably optimised. The result is clear: greater stability, lower risk and a longer service life.
Intelligent expansion and maximum effectiveness during the process
KREMporEx is supplied in a defined thickness and only achieves its full effect during the manufacturing process. During impregnation or upon thermal activation, the material expands in a targeted and controlled manner – precisely where stability and gap-filling are required. Depending on the variant, exceptional expansion rates are achieved:
- ≥ 750% expansion at 0.33 mm (measured up to 1440%)
- ≥ 500% expansion at 0.50–3.0 mm (measured up to 910%)
This enormous increase in volume enables reliable, uniform filling of even complex geometries.
Our product range: precisely tailored to your application
Polyester-based solutions:
- KREMporEx K8029: Polyester non-woven fabric without accelerator
- KREMporEx K8022: Polyester non-woven fabric with accelerator
- KREMporEx-R K8029: Conductive polyester variant without accelerator
- KREMporEx-R K8022: Conductive polyester variant with accelerator
With conductive and non-conductive versions, Krempel offers maximum flexibility for a range of electrical and mechanical requirements.
Glass-based alternative: DELPORMAT H:
DELPORMAT H, a glass fibre-based expanded solution, is available for specific applications.
- Thickness: 0.5 – 2.2 mm
- Expansion ≥ 200 %
- Variants with and without accelerators
DELPORMAT complements the product range in cases where material- or process-specific requirements call for a glass-based solution.
Areas of application
In slot applications, precise gap filling is crucial for mechanical stability. KREMporEx expands after preheating or during impregnation, securing magnetic slot wedges permanently and reliably.
Your benefits:
- positive-lock fixing
- greater operational reliability
- Improved long-term performance
In the winding head area, dynamic loads place high demands on stability.
KREMporEx and DELPORMAT automatically adapt to complex winding geometries and provide long-term structural stability.
This means:
- Protection against movement
- Minimisation of micro-damage
- Increased service life of the machine
With KREMporEx-R, Krempel offers a conductive expansion solution for use as a slot ground filler. Once dried or impregnated, it forms a precisely fitting, functional filler that intelligently combines mechanical stabilisation with electrical functionality.
Your benefits at a glance
- Exceptionally high expansion rates
- Controlled activation during the process
- Excellent resin absorption
- Reduction of air pockets
- Conductive and non-conductive variants
- High process reliability and reproducibility
More than just expansion – a quality factor in the insulation system
The unique material structure of KREMporEx ensures excellent absorption of impregnating resin. This reduces air pockets and prevents weak points in the insulation system – a crucial factor for thermal stability and electrical safety. KREMporEx thus becomes an active quality component throughout the entire manufacturing process.
With KREMporEx & DELPORMAT, Krempel combines decades of experience in insulation systems with pioneering material technology. Whether in industrial drives, generators or e-mobility applications – Krempel’s expanding materials make a measurable contribution to the efficiency, safety and service life of electrical machines.
