Name: LOCTITE EA 3985
Brand: Henkel Corporation
SKU: LOCTITE EA 3985

Main features

Fast Heat-Cure Production Bonding
Non-Sag Wire-to-Armature Application
One-Part No-Mix Processing

Product Description

LOCTITE EA 3985 is a one-component, non-sag epoxy adhesive for fast heat-cure production bonding. Its rheology limits flow away from wire windings while still allowing penetration around the wires, making it well suited to bonding wires to armatures. The product requires no component mixing and uses a normal cure cycle of 45 minutes at 121 deg C, with an alternate 30-minute cycle at 149 deg C. The cured epoxy also provides electrical insulation properties for the bonded assembly.

Key features

One-part application: Single-component format requires no resin-to-hardener mixing before dispensing.
Non-sag wire bonding: Rheology limits run-off from windings while allowing penetration around wires.
Fast heat cure: Heat-cure cycles include 45 minutes at 121 deg C and 30 minutes at 149 deg C.

Applications

Applications include bonding wires to armatures in heat-cure industrial assembly processes.

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Appearance

Black paste

Chemistry Type

Epoxy

Specific Gravity

1.23 to 1.28

Physical Properties

Viscosity

40,000 to 50,000 mPa.s

Electrical Properties

Volume Resistivity

31×10¹⁵ Ohms⋅cm

Other Properties

Storage Temperature

2 °C to 8 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Property	Value	Unit	Method / condition
Specific gravity	1.23 to 1.28		LMS range; 25 deg C
Viscosity	40,000 to 50,000	mPa s	LMS range; Brookfield RVT; 25 deg C; spindle 7; 20 rpm
Gel time	10	min	Typical; 121 deg C; 10 g mass
Normal cure cycle	45	min	Typical curing performance; 121 deg C
Alternate cure cycle	30	min	Typical curing performance; 149 deg C