Commercial Grade Leatheroid Paper

Kraft Paper (KPEI)

Commercial Grade Leatheroid Paper

Kraft Paper (KPEI)

ASPHA's Kraft Paper (KPEI) is a commercial-grade product, commonly referred to as Commercial Grade Leatheroid Paper, manufactured in accordance with company standards.

Available in undyed, black, and green colors, in mil thicknesses ranging from 5 Mil to 20 Mil, produced in reels with a 40" (1000 mm) width. Developed using our proprietary in-house technology and R&D, these products are widely accepted for core/slot insulation in transformers, electric motors, pumps, chokes, and other electrical equipment.

Available Shades & Applications

Shade	Application
Undyed	Suitable for repairing of transformers and electrical motors.
Black	Suitable for use in electrical motors and pumps.
Green	Used as backing paper for lamination with polyester films for Class E insulation, and also utilized as stand-alone insulation in electrical motors. Custom-manufactured per specifications and required thickness.

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Kraft Paper — KPEI

Technical Specifications

Product Code	KPEI
Grade	Commercial Grade
Thickness Range	0.13 mm – 0.50 mm (5 Mil to 20 Mil)
Reel Width	40" (1000 mm)
Colours	Undyed / Black / Green
Density	Min 1000 kg/m³
B.D.V. in Air	1.0 – 2.4 kV (min, by thickness)
Tensile Strength MD	100 – 250 N/15mm (min)
Tensile Strength CD	30 – 110 N/15mm (min)
pH Aqueous Extract	5.0 – 8.5
Moisture Content	Max 8%

Full Specification Table

All values measured under our in-house lab conditions per applicable standards.

Characteristic	Units	Tol.	5 Mil	7 Mil	10 Mil	15 Mil	20 Mil
			0.13 mm	0.18 mm	0.25 mm	0.38 mm	0.50 mm
Thickness (mm)	mm	Range	0.13+0.02/−0.01	0.18±0.02	0.25±0.02	0.38+0.04/−0.03	0.50±0.04
Density	kg/m³	Min	1000	1000	1000	1000	1000
B.D.V. in Air	kV	Min	1.0	1.3	1.6	2.1	2.4
Tensile Strength MD	N/15mm	Min	100	120	160	200	250
Tensile Strength CD	N/15mm	Min	30	40	60	80	110
pH Aqueous Extract	—	Range	5–8.5	5–8.5	5–8.5	5–8.5	5–8.5
Moisture Content	%	Max	8	8	8	8	8

Results obtained from tests are based on our in-house lab conditions. These results may vary under different conditions, and we are not legally liable for any assurances or values obtained outside our specified test parameters.

Key Applications

Industries where Kraft Paper is commonly applied.

Core/Slot Insulation – Transformers

Electric Motors

Pumps

Chokes

Transformer Repair

Class E Lamination Backing

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