Krempel / Krempel Group Electrical Insulation Materials and Advanced Composites

High-performance electrical insulation materials and advanced composites from Krempel / Krempel Group: Trivoltherm multilayer laminates, PRESPAN transformer pressboard, VIDAFLEX braided sleevings, WACOSIT pultruded profiles, and BAKELAQUE prepregs. Engineering selection per industrial standards.

Multilayer Flexible Electrical Insulation Laminates Trivoltherm

Krempel / Krempel Group Trivoltherm multilayer laminates provide durable slot and phase insulation for industrial motors and generators. The three-layer film and Nomex paper structure delivers high tear resistance and oil stability.

Three-layer composite configurations Trivoltherm N and Trivoltherm P
Motor slot liners, phase separators, and preformed coil closures
High chemical compatibility with solventless impregnating resins
Delivered in master rolls, customized slit tapes, and creased coils

Transformer Pressboard and Insulation Components PRESPAN

Krempel / Krempel Group PRESPAN electrical pressboard is manufactured from pure unbleached sulphate wood pulp without chemical binders. It provides superior dielectric breakdown strength and rapid oil absorption for oil-immersed transformers.

Calendered pressboard sheets, continuous rolls, and formed shapes
Winding insulation cylinders, spacing strips, and molded angle rings
High chemical purity with ultra-low ash content and minimal conductivity
Rapid oil impregnation and stable dielectric performance under stress

Braided Fiberglass Electrical Insulating Sleevings VIDAFLEX

Krempel / Krempel Group VIDAFLEX braided electrical insulation sleevings protect motor lead wires and wiring harnesses. The alkali-free glass yarn sleeve is coated with silicone or polyurethane, delivering high dielectric insulation and vibration damping.

High-density braided alkali-free E-glass yarn core substrate
Extruded silicone elastomer and flexible acrylic resin topcoats
Insulation for stator lead-out wires, terminal studs, and wire looms
Outstanding resistance to ozone, industrial oils, and moisture

Pultruded Composite Profiles and Slot Wedges WACOSIT

Krempel / Krempel Group WACOSIT structural fibre-reinforced profiles are manufactured using continuous pultrusion with epoxy resins. The sections combine flexural stiffness with electrical insulation, serving as generator stator slot wedges.

Continuous pultrusion using continuous glass rovings and epoxy resins
Trapezoidal, semi-round, and custom-machined stator slot wedges
High mechanical flexural modulus without electrical conductivity
Immunity to electrochemical corrosion, tracking, and flashovers

Thermosetting Prepregs and Structural Laminates BAKELAQUE

Krempel / Krempel Group BAKELAQUE advanced prepregs comprise glass fabrics impregnated with reactive phenolic resin systems. Formulated to meet strict international FST fire safety standards, they are designed for hot compression molding of components.

Engineered semi-finished reinforcements using glass, carbon, and aramid
Controlled-cure phenolic and epoxy matrices for hot compression press
Full compliance with global aerospace and railway FST flame standards
Manufacture of structural interior partitions, ducts, and radomes

Mica Insulation Tapes and High Voltage Products Krempel FIROX

Krempel / Krempel Group FIROX high-voltage mica tapes provide conductor and groundwall insulation in rotating electrical machines. The mica paper layer is reinforced with glass fabric or films, resisting partial discharges and voltage gradients.

High-voltage mica tapes based on uncalcined muscovite and phlogopite
Reinforced with woven glass fabric and high-temperature backing films
Main insulation for turbo-generators, traction motors, and wind systems
High resistance to partial discharge erosion and thermal degradation

Selection and slitting procedures for Trivoltherm slot insulation in motor rewinding

During major overhaul and stator rewinding of industrial electric motors, selecting the proper Krempel / Krempel Group Trivoltherm multilayer composite laminate is critical.

The laminate configuration depends on the insulation thermal class: Class H machines require Trivoltherm N incorporating Nomex aramid paper, whereas Class F applications use Trivoltherm P with calendered presspaper.

Slitting and cuffing of slot liners is executed on precision shears with paper fibres oriented parallel to the core slot axis. Preformed cuffed insulation sleeves are positioned inside core laminations, preventing mechanical damage from magnet wires.

Preparation and vacuum drying of PRESPAN pressboard for transformer core assembly

Assembling the dielectric barrier insulation in liquid-immersed power transformers demands high-purity Krempel / Krempel Group PRESPAN transformer pressboard.

Machined insulation components including spacing strips, winding cylinders, and angle rings are preconditioned according to engineering drawings. Vacuum chamber drying of the active core and winding assembly proceeds until residual moisture content drops below one percent.

The uniform porosity of unbleached sulphate cellulose ensures deep and complete impregnation with degassed transformer mineral oil under high vacuum.

Installation of VIDAFLEX braided fiberglass insulating sleevings over coil leads

Insulating stator coil lead wires and brazed terminal lugs is carried out using Krempel / Krempel Group VIDAFLEX flexible braided sleevings. Depending on the varnishing process, sleevings with extruded silicone rubber or crosslinked acrylic resin topcoats are selected.

Each sleeving sleeve is slipped over the copper conductor, overlapping the brazed terminal joint by at least twenty millimetres.

The resilient braided glass yarn core conforms snugly around the conductor and cushions against severe mechanical vibrations in winding overhangs, protecting the dielectric barrier.

Mounting WACOSIT pultruded composite slot wedges into rotating machine cores

Securing heavy windings within open and semi-closed stator slots of large generators and traction motors is performed with Krempel / Krempel Group WACOSIT pultruded composite wedges.

Fibre-reinforced profiles with trapezoidal or radiused cross sections are trimmed to slot length while verifying edge smoothness. The wedge is driven into the slot dovetail with controlled insertion force using a guided drift tool.

The high elastic flexural modulus of the composite section prevents wedge loosening under severe cyclic electromagnetic vibration forces.

Hot compression molding cycle for BAKELAQUE prepregs in electrical component production

Fabricating structural insulating barriers, arc chute baffles, and equipment housing components utilizes Krempel / Krempel Group BAKELAQUE advanced prepregs. Pre-cut prepreg plies are nested into steel molds with alternating warp yarn orientations to ensure isotropic mechanical strength.

Pressing is conducted inside hydraulic compression presses with heated platens under tightly controlled specific pressure profiles. The thermosetting phenolic matrix cures completely, delivering international FST fire safety compliance and robust structural stiffness.

Krempel / Krempel Group and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Krempel / Krempel Group and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.