Fast dry epoxy dipping resin R-831-7

impregnating varnish R-831-7 1.Easy to use 2.good manufacturability 3.low cost 4.high mechanical strength

Brief Introduction

R-831-7 is a two component dipping resin which is formed by epoxy resin, curing agent and styrene. The two component (part A and part B) is 1/1 by weight ratio.It’s heat-resistant grade is B,F. It passed the UL attestation, and it correspond the RoHS environmental protection requirement.

Features

Easy to use, low cost, good manufacturability and insulation property, high mechanical strength.

Applications

Be used for fast drying impregnation, continuous immersion and vacuum impregnation of small stator coils and windings. Like fan motors, air-condition motors, electrical tools motors and water pump motors.

Qualification (as the Q/R 101-2010 company standard)

No.	Test Item	Test Method	Unit	Value
1	Appearance	Test Tube	-	Brown uniform liquid, no mechanical impurities
2	Viscosity	4#cup, 23±1°C	s	11-13
3	Drying Time	120±2°C	min	≤30
4	Solids content	120±1°C,1h	%	28-32
5	Curing in thick layer	45×45×25mm 90°C 1h 110°C 1h 125°C 2h		No less than S1U1I4.2
6	Power Frequency Electric Strength	Normalcy	MV/m	≥70
		After immersion in water
				≥50
7	Volume Resistivity	Normalcy	Ω·m	≥1×1012
		130±2°C		≥1×107
		After immersion in water		≥1×1010

Usage

1. Fast drying impregnation process

1.1 Preheat unit for 1-3 hours at 100-120°C.

1.2 Allow unit to cool to 60°C before dipping into varnish, dip unit in varnish for 2-15 mins until basically no bubble.

1.3 Drain unit for 30-60 mins.

1.4 Bake unit for 2-3 hours at 115-125°C.

2. Continuous immersion process

Flow chart

Start	preheat	cool	immersion		Drain	cure	off
rhythm	2	2	1		2	13-17
(1)rhythm time				3-7 mins
(2)preheating temperature				125-135°C
(3)gel temperature				120-130°C
(4)curing temperature				125-135°C

Fast dry epoxy dipping resin R-831-7