Electrical Insulation Cylinders

Conder offers a comprehensive range of electrical insulation cylinders to BS EN ISO 9001.  Using a range of base papers and laminating resins, a variety of cylinder grades can be manufactured to meet any requirement, such as winding cylinders, support tubes, coil formers, helical end collars and stress ring formers, or any other application requiring lightweight, high strength electrical insulating cylinders.

Cylinders produced from phenolic bonded paper are available in sizes from 50mm to 1880mm diameter and in unjointed lengths up to 3.1m.  Glass and cotton cylinders are also manufactured on Conder's extensive range of mandrels, but with lower axial lengths.

We can also offer a winding service for your own materials (epoxy glass, fabric, mica) using our vast range of large mandrels.

Grades and applications (in italics)

Grade E - Temperature/Class A/E

Relatively absorbent phenolic paper laminate, ideal for high voltage work in oil immersed applications due to its good absorbency. 

Winding cylinders HV (in oil), barrier cylinders HV/LV (in oil).

Grade EM Temperature/Class A/E

Phenolic paper laminate that is mechanically stronger than Grade E but still capable of oil impregnation.  The most popular grade for winding cylinders can be cut, drilled and shaped, so it is ideal for helical or straight transformers end insulation.  Suitable for vapour phase drying treatment. 

Winding cylinders HV (in oil).  Winding cylinders LV (in oil or air).  End insulators.  Support tubes.  Oil flow tubes.  Lead supports.

Grade M Temperature/Class A/E

Full resin impregnated phenolic paper laminate with very low absorption but excellent mechanical strength and machinability.  Suitable for vapour phase drying treatment. 

Winding cylinders HV (in air).  Winding cylinders LV (in oil or air).  Stress ring formers.  Tank bodies.  Capacitor housings.  Insulated handles.  Magnet formers.  MRI cylinders.

Grade FRC 28 Temperature/Class A/E

Medium grade cotton phenolic laminate with good machinability. 

Low voltage insulation applications.

Grade FRC 32 Temperature/Class A/E

A fine grade cotton phenolic laminate with good mechanical properties and excellent machinability. 

Machine parts.  Marine bearings.

Grade FRG 46 Temperature/Class F

Woven glass epoxy resin laminate for class F use (155°C) - axial length limit 1.5m. 

Magnet formers.  MRI cylinders.  Class F high temp cylinders and collars.

See mandrel list for standard sizes and tolerances.  No British Standard covers this cylinder size range.  Materials offered are similar to those set out in IEC 1212 and the corresponding DIN and NEMA grades.