Name: ABLESTIK 642-1
Brand: Henkel Corporation
SKU: ABLESTIK 642-1

Main features

Extended 8-Hour Assembly Window
Multiple Heat-Cure Schedules
Low-Outgassing Assembly Bonding

Product Description

LOCTITE ABLESTIK 642-1 is a one-part, transparent, unfilled epoxy adhesive for general assembly bonding. It combines an 8-hour work life at 25 deg C with elevated-temperature cure options of 2 hours at 75 deg C, 1 hour at 95 deg C, or 30 minutes at 120 deg C. The cured adhesive has a typical Shore D hardness of 87 and aluminum-to-aluminum lap shear strength of 19.3 N/mm^2 at 25 deg C. The formulation passes NASA outgassing standards, making it relevant to assemblies that require controlled outgassing alongside heat-cure processing.

Key features

Extended assembly window: An 8-hour work life at 25 deg C provides time for adhesive application and part positioning.
Multiple elevated-temperature cures: Three cure schedules allow selection between lower-temperature processing and a faster 30-minute cycle.
Low-outgassing performance: The formulation passes NASA outgassing standards for assemblies that require controlled outgassing.

Applications

Applications include general assembly bonding and heat-cured assemblies that require low-outgassing performance.

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Appearance

Transparent liquid

Component System

One-component

Work life @25°C

8 hours

Physical Properties

Thixotropic index

1.0

Viscosity

5,500 mPa.s

Thermal Properties

Glass Transition Temperature (Tg)

137.0 °C

Electrical Properties

Volume Resistivity

6.50×10¹⁴ Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Technical values are typical; the listed cure schedules are guideline recommendations.

Property	Value	Unit	Method / condition
Appearance	Transparent liquid		As supplied
Viscosity	5,500	mPa s	25 deg C
Thixotropic index	1.0		Typical
Work life	8	hours	25 deg C
Shelf life, pre-mixed frozen	365	days	-40 deg C
Shelf life, kits	365	days	25 deg C
Cure schedule	2 at 75; 1 at 95; 0.5 at 120	hours at deg C	Guideline heat-cure options

Technical properties

After-processing / final-state properties

Values are typical for cured LOCTITE ABLESTIK 642-1 under the stated conditions.

Property	Value	Unit	Method / condition
Shore D hardness	87		Typical cured material
Glass transition temperature	137.0	deg C	Typical cured material
Coefficient of thermal expansion	84	ppm/deg C	Typical cured material
Volume resistivity	6.50 x 10^14	ohm cm	100 deg C
Dielectric constant	3.36		1 kHz
Dissipation factor	0.007		1 kHz
Lap shear strength	19.3	N/mm^2	Aluminum-to-aluminum; 25 deg C