- Electrical conductivity which makes essential the use of an underlying electrical insulation to avoid shorting and flashover.

- The generation of eddy currents which cause local overheating and in turn contribute to fatigue and welding between adjacent end turns.

-Relatively high material and application cost.

-Susceptibility to corrosion on exposure to moisture with resulting mechanical failure.

The following products for banding applications are available:

Polyglas® P30 is a basic class F (155 °C) banding tape, used for banding rotors, overhangs, collectors and dry and oil filled transformer.

Polyglas® H200 is a standard class H (200 °C) moisture resistant banding tape, used mainly for banding rotors and overhangs.

Polyglas® H220 is an improved class C (220 °C) moisture resistant banding tape, used mainly for banding traction rotors, collectors and overhangs.

Polyglas® K220 is the ultimate class C (220 °C) moisture resistant banding tape, Kevlar® based, used mainly for banding permanent magnets rotors, high speed starters and whenever steep operative cycles or reduced spaces are required.

Polyglas K-220, 180m roll

Introducing POLYGLAS K220

25 years after introducing, as a true innovation, its famous Moisture Resistant Polyglas H200. VonRoll is moving one step beyond by putting on the market its new Polyglas K220. This new material is no more than a class C, moisture resistant, extra strong B-Stage banding tape. It combines the best of an outstanding thermal resistant synthetic resin, a selection of reinforcement fibres offering extremely high tensile strength, and a well mastered manufacturing process that guarantees consistent quality over the year, long shelf life, high wetting power of the fibres for your perfect application.

Polyglas K220, when properly processed, is made to offer a tensile strength that is twice bigger than anyone of the best market glass reinforced banding tapes. It is then a material of choice for designers of electrical rotating machines who are thinking of increased rotational speed, higher inertia, lower space, increased safety factors, etc.

Polyglas K220, like any B-Stage tape is to be processed with a suitable tensioning device. As it 100% insulating, it may advantageously replace carbon fibres, pure Kevlar tapes, stainless steel banding, and even stainless steel retaining rings.

Whether you are designing or repairing permanent magnet rotors, slip ring motors, traction motors, wind mill generators, high speed generators, turbine generators, brushless AC motors or any other rotating machines that needs a critical banding system.

DATA SHEETS POLYGLAS®

P30/H200/H220/K220

Main Characteristics

Anker

Characteristics as supplied		P30	H200	H220	K220	Test Norm
Thickness	mm	0.30±0.03	0.30±0.03	0.30±0.03	0.33±0.03	IEC 60371-2
Total weight	g/m²	600±60	600±60	600±60	600±60	IEC 60371-2
Volatile content	%	0,9±0,5	0,9±0,5	0,9±0,5	0,9±0,5	ASTM D 2369-A
Resin content*	%	26±2	26±2	26±2	26±2	ASTM 2408-6.2.2
Number of yarns/cm	n	30±1	30±1	30±1	26±1	ASTM D 902
Minimal tensile strength	N/cm	2000	2000	2000	4000	IEC 60934-2
Pull in banding	N/cm	≤1000	≤1000	≤1000	≤2000

*content of 22% on request

Characteristics after application and curing		P30	H200	H220	K220	Test Norm
Thermal Class	°C	155 (F)	200 (H+)	220 (C)	220 (C)	IEC 60085
Cured Thickness	mm	0.25 ±0.02	0.25 ±0.02	0.25 ±0.02	0.31 ±0.02
Minimal Tensile Strength referred to
one tape layer at 20°C	N/cm	2500	2500	2500	3500
one tape layer at thermal class	N/cm	1800	1800	1800	2500
Modulus of Elasticity
at 20°C	N/mm²	62000	62000	62000	80000
at thermal class	N/mm²	50500	52000	50500	65000
Elongation at break at 20°C	%	1.6	1.6	1.6	0.6
Elongation at break at thermal class	%	1.4	1.4	1.4	0.5
Breaking load at -35°C	N/cm	2700	2700	2700	2700
Coefficient of Linear Expansion	1/°C	6,5 E-6	6,5 E-6	6,5 E-6	6,5 E-6
Thermal conductivity	W(m°C)	0,53	0,53	0,53

Shelf life as supplied

Before removing cool material from plastics bag let the tape reach room temperature