Description of YE-7002/YH-7002

Dual-system transformer epoxy hardener, liquid at RT, optimized vacuum casting. Features minimal curing shrinkage, exceptional molded-part stability, user-friendly processing, and robust electrical characteristics.

Specification

A component: YE-7002 Resin is a modified BPA epoxy resin
Items	Unit	Standard
Appearance	Visual	Green viscous liquid
Viscosity (40℃)	mPa.s	4000-8000
Density (25℃)	g/cm³	1.6-2.1
Vapor pressure(25℃)	Pa	＜0.01
Flashing point	℃	Approx.135

B component: YH-7002 Curing Agent is a liquid modified carboxylic anhydride curing agent
Items	Unit	Standard
Appearance	Visual	Pale yellow viscous liquid
Viscosity (40℃)	mPa.s	2000-4000
Density (25℃)	g/cm³	1.6-2.1
Vapor pressure(25℃)	Pa	Approx.0.5
Flashing point	℃	Approx.140

Application

Dry-type transformers, dry-type reactors, special transformers, etc.

Gel time

Temperature	Gel Time
At 120 ℃	20-30mins
At 140 ℃	10-15mins
At 160 ℃	5-8mins

Physical & Mechanical Properties

Test mode:

Mix. Ratio: YE-7002 Resin/YH-7002 curing agent: 100/100

Curing conditions: 80℃*2hours+140℃*8hours

Ps.: Properties are validated per national guidelines and shared for preliminary reference. We recommend end-users conduct independent verification tailored to their specific use-case requirements.

Properties	Typical value	Properties	Typical value
Tg(DSC)	70-80℃	Thermal conductivity	0.8-0.9W/mk
Tensile strength	60-85N/mm²	Thermal decomposition temperature	＞320℃
Flexural strength	100-130N/mm²	Water absorption(23℃*10days)	0.10-0.20%by wt.
Compressive strength	140-180N/mm²	Water absorption(100℃*60mins)	0.08-0.15%by wt.
Impact strength	8-14kJ/m²	Surface resistivity	10⁴Q
Curing shrinkage	0.7-0.9%	Volume resistivity	10"Q.cm
Flammability(4mm)	HB degree	Dielectric strength	30kv/mm
Flammability(12mm)	V1 degree	Dielectric loss	0.02

Storage

Components must be stored dry in sealed containers (6–35°C). Shelf life:6months (labeled). Post-expiry reuse requires retesting. Secure containers after partial withdrawal.