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Phenolic Modified Polyester Impregnating Varnish

Model: YA1040

Insulation class: F class (155 °C)

Can be customized

F grade insulating material. Has excellent mechanical, heat resistance and electrical properties, long-term operating temperature of 155 °C.

polyester resin, modified resin, xylene, butyl acetate, etc.

F grade insulating material. Has excellent mechanical, heat resistance and electrical properties, long-term operating temperature of 155 °C.

No.	Item		Unit		Normal value
1	Appearance		—		Uniform solvation, smooth surface after drying
2	Viscosity,by viscosimeter No.4,at (23±1) °C		s		35±10
3	Solid content at 105±2 °C for2h		%		46±2
4	Electric strength	At room temperature	MV/m		>70
		Flooding after 24 h			>60
		(155±2) °C			>30
5	Volume resistivity	At (23±2) °C	Qcm		>1x1O10
		Flooding after 7 days			>1×106
6	Solvent Resistance		—	No Change, tack-free, non-foaming, not sticky, at least passed 2 of these 5 solvents
	(Benzol, acetone, Methanol, hexane,
	carbon disulfide)
7	Thermal Class	Centigrade	r	>155
	Storage Period	23°C	M	6
8	Recommended	80±5°C/2h, 125±5°C/2 〜4h, 150±10°C/6 〜8h
	Curing Condition	electric resistance reach the steady value

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Electrical Machinery: Primary application. Used for impregnating windings of low/medium-power motors (e.g., three-phase asynchronous motors, fan motors, pump motors), small transformers (e.g., power distribution transformers, audio transformers), and generators, forming an integrated insulating system to improve heat dissipation and insulation reliability.
Household Appliances: Applied to windings of household appliance motors (e.g., washing machine motors, refrigerator compressors, range hood motors) and small electrical components (e.g., hair dryer heating coils), adapting to the intermittent high-temperature operation of appliances.
Industrial Control & Electronics: Suitable for impregnating coils of relays (e.g., industrial control relays, automotive relays), inductors, and solenoids (e.g., electromagnetic valves), enhancing moisture resistance and anti-vibration performance.
Specialty Equipment: Used for low-voltage electrical windings in moderately harsh environments (e.g., agricultural irrigation motors, marine auxiliary electrical equipment), excluding scenarios with long-term high temperatures (＞130℃) or strong chemical corrosion.