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Prepregs and auxiliary materials used in insulation systems

Scope of application of construction and auxiliary materials is quite extended. Besides their application upon manufacture and repair of electrical machines, mechanisms and equipment of different purposes, materials of this group can be also applied for the manufacture of various parts and winding items, as well as for solution of various technological tasks in the most diverse areas.

Glass cloth impregnated with silicone resin:

This material is quite sticky and used as prepreg for different kinds of application and as repairing tape in different applications.

Name	Composition	Thermal class	Thickness range, mm
Sticky glass cloth LSKL-155/180	Glass cloth impregnated with silicon resin	F/H	0,12
			0,15

Prepregs:

Prepregs are various materials impregnated with epoxy resin in B-stage. This kind of materials is shaped by the consumer and cured under pressure and heat.

Name	Composition	Thermal class	Components mass content, % (in case of 100 g/m2 glass cloth)
			Resins	Volatiles, max.	Soluble part of resin, % min.
Prepreg PS-FAF/EP	Glass cloth impregnated with modified epoxy resin in B stage	F/H (by agreement)	50±10	3,0	90,0

Flexible silicone content tape:

This material consists of glass cloth which is impregnated with silicone resin . The material is very flexible for phase insulation and end winding bracing of motors and generators which operate at temperatures from -60 up to +260 °С.

Name	Composition	Thermal class	Thickness range, mm
Tape LSi-T	Glass cloth impregnated with silicone resin	C	0,10-0,15

Preconsolidation materials:

These materials are used to preconsolidate high-voltage machine bars and coils.

Name	Composition	Heat resistance class	Thickness range, mm	Binder mass content, min %
Delmicapreg	Mica paper prepreg	H	20-35	1,0-3,0
Deglasspreg	Glass cloth/Glass cloth laminate/Glass cloth	H	30	0,8-1,55

Porous plastics:

BSMB porous plastic is applied in the VPI systems as gaskets and space-filling material in different parts of electric winding and fixation of magnetic system coils on the rods. For application of BSMB porous plastic in combination with the impregnation compounds based on epoxy-anhydride systems, accelerator based on organic zinc salt can be added upon its manufacture. Thermal class of porous plastics is determined by the applied impregnation resin.

Name	Composition	Thickness range, mm	Material surface density, g/m²
BSMB	Polyester fiber / Glass fibre mat / Polyester fiber	0,40-0,50	130 ±20

Materials with asbestos:

Intended for inter-turn insulation of coils of the drive motors magnetic system, electric insulation of wires, cables, elements off electric machines and mechanisms.

Name	Composition	Heat resistance class	Thickness range, mm
LAE-ТТ	Glass/Asbestos paper/ Glass	C	0,3-0,5
LAE-TPl	PET-film/Аsbestos paper/ Glass	C	0,3-0,5

Protective and banding tapes:

Protective tapes LES-F-Т, LES-F-Т(l) and BSB are intended for creation of a protective layer of frame insulation of windings of the electric machines and mechanisms. Tapes LSBE-155-М and LSBE-180-М are banding tapes to make commutator bandage. Tapes LSBE-155-М and LSBE-180-М are banding tapes for DC-motors bandaging and transformers construction.

Name	Composition	Heat resistance class	Thickness range, mm
LES-F-Т(Т)	PET/Glass cloth	F/H	0,05-0,20
LES-F-Т(l)	PET/Glass cloth + adhesive layer	F/H	0,05-0,20
BSB	Glass cloth with nonwoven synthetic paper on both sides	C	0,10-0,20
LSBE-155-М	Glass threads impregnated with epoxy resin	F	0,2-0,3
LSBE-180-М	Glass threads impregnated with modified polyester resin	H	0,2-0,3