Phenolic paper laminate sheet

 Phenolic paper laminate sheet electrotechnical sheet (GOST 2718-74) is layered plastic which turns out a method of hot pressing of the paper impregnated thermoreactive bonding on the basis of phenol-formaldehyde or epoxy of pitches. It is used as a material for isolation in conditions of normal relative humidity of an environment and in transformer oil at a pressure up to 1000V.  Phenolic paper laminate sheet it is possible is long to maintain at working temperature from-65°С up to +120°С.

There are some versions phenolic paper laminate sheet, they differ among themselves with conditions of operation and structure of which they are made.

 Phenolic paper laminate sheet I: thickness of a leaf from 0,4 up to 50 mm is made from structure on the basis of  phenol-formaldehyde  pitches. Has high mechanical properties, well gives in to machining sharp and drilling. Differs low water absorption and preservation electrical insulating properties at change of humidity. It is intended for work on air, it is recommended to application in low-voltage technics up to 1000V conditions of normal relative humidity of an environment and in transformer oil.

  Phenolic paper laminate sheet V: it is made on the basis of combined epoxy and phenol-formaldehyde pitches, thickness from 1,0 up to 50,0 mm. Besides good mechanical parameters, has excellent electrical insulating properties: high electric durability along layers and low value of a tangent of a corner of dielectric losses. It is used as electrical insulating a material in conditions of normal relative humidity of air and in transformer oil at a pressure from above 1000V and frequency of a current up to 106 Hz.

 Phenolic paper laminate sheet LE (lavsan electrotechnical), it is made on TC 16-503.224-82. Represents the layered pressed material consisting of several layers of a polyester paper, impregnated thermosetting plastics. The range of working temperature at long operation makes from-65°С up to +150°С. It is applied as a material to electroisolation, at work on air in conditions of normal relative humidity, and also in conditions of the raised humidity of 93 % at temperature 40°С.

Phenolic paper laminate sheet , CHARACTERISTICS:

 

Mark	Structure	Class Т	Purpose	Dimensions
Lavsan turbonit LT TC 16-503.224-82	Lavsan paper bonding of mix epoxy and phenol	155° С	For work on air, in conditions of normal and relative humidity without additional a varnish covering for protection against a moisture — (93±2) % and that (40±2) °С., and also in conditions of the raised humidity-224-82 at (45-75 %) and that 15-35 C.It is long admissible working temperatures from a minus 65ºC up to 150ºC	Sheets in the size от-(450-950) х (700-1480) mm; thickness of 0,5-50 mm
Phenolic paper laminate sheet 1 GOST 2718-74	Insulation impregnation paper phenol formaldehyde binding	120° С	For work on air in conditions of normal relative humidity at (45-75 %) and temperature 15-35°С and in transformer oil at a pressure up to 1000V and frequency of a current 50 Hz	Sheets of the size — (450-980) х (700-2480) mm; thickness of 0,2-50 mm
Phenolic paper laminate sheet V GOST 2718-74	Insulation impregnation paper epoxy  phenol binding	120° С	For work on air in 120ºC conditions (15-35) °С 45-75 % and in transformer oil at a pressure from above 1000 V and frequency of a current of 106 Hz	Sheets in the size (450-980) х (700-2480) mm; thickness of 1,0-50 mm.

 

The name of parameters	Unit of measure	LG	I	V	Х
Breaking point at a bend to perpendicularly layers, not less:	MPa	130	135	135	135
Breaking point at a stretching, not less	MPa	100	120	80	-
Electric durability to perpendicularly layers (one-minute testing in conditions of M (90°С), transformer oil, not less — for т. 3,0 mm	kV/mm	11,5	3,7	10,2	11
Penetrative pressure in parallel layers (one-minute testing) in conditions of M (90°С), transformer oil, not less	kV	40	16	-	40
Specific volumetric electric resistance for sheets  thickness up to 4mm after air-conditioning in conditions 96 h/ 40 ºС / 93 %, not less	Ohm-m	5x108	-	-	-
Specific volumetric electric resistance after air-conditioning, in conditions 24h / 23 ºC / 93 %, not less -thickness Up to 2,0 mm -thickness Up to 8,0 mm	Ohm-m	5x108	1-106	1-108	1-1010
Tangent of a corner of dielectric losses at frequency of 50 Hz after air-conditioning in conditions 96h / 105 ºC / <20 %, no more	-	0,04	-	0,05	-
Water absorption, no more thickness of 3,5 mm:	mg	50	575	280
Density	kg/m³	1250-1350	1300-1400	1300-1400	1300-1400