Harmonization Code : 3506.91.90.99 |   Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
  • High bond strength
  • High purity
  • Electrically conductive

Product Description

We regret to inform you that after the discontinuation of 71-X series in EU in March 2020 (by REACH/ECHA health and safety related handling restrictions per May 2020 in EU), there is now also a GLOBAL 71-X discontinuation due to a specific Raw Material discontinuation. Effective from the middle of September 2021.

Looking for a 71-1 alternative? Some close, but not drop in, solutions are LOCTITE ABLESTIK 8700E, LOCTITE ABLESTIK QMI529HT-LVLOCTITE ABLESTIK 8064 and LOCTITE ABLESTIK 8068TB. There's also LOCTITE ABLESTIK 8700K for a Non Conductive option.

Check the alternative product table in the Additional information section and contact us for a quotation or for further advice.


LOCTITE ABLESTIK 71-1 die attach adhesive is designed for microelectronic and semiconductor packaging applications. It is formulated to provide high bond strength at ambient and elevated temperatures.

Product Family
1cc Syringe 3cc Syringe

No longer available

This product is no longer available or will become obsolete soon. Please contact us so we can recommend an alternative product.

Technical Specifications

General Properties
Collected Volatile Condensable Materials
0 %
Total Mass Loss
0.25 %
Shelf Life
Shelf Life
Shelf life is the amount of time after manufacturing that a product is guaranteed to retain its properties.

It differs vastly per product and it is based on temperature and storage conditions.

The properties can be guaranteed for the temperature and time range indicated on the TDS since those are the ones tested to be the best for the product.
Shelf Life @ -40°C 365 days
Physical Properties
Thixotropic index
Thixotropic index
Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten.

A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads.

It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.
Viscosity is a measurement of a fluid’s resistance to flow.

Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.

A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.

The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
14,000 mPa.s
Chemical Properties
Ionic Content
Chloride (Cl-)
Chloride (Cl-)
The amount of Chloride (Cl-) ion extracted from the product in parts per million (ppm)
5 ppm
Potassium (K+)
Potassium (K+)
The amount of Potassium (K+) ion extracted from the product in parts per million (ppm)
5 ppm
Sodium (Na+)
Sodium (Na+)
The amount of Sodium (Na+) ion extracted from the product in parts per million (ppm)
5 ppm
Moisture absorption 0.6 %
Mechanical Properties
Shear strength
Shear Strength @25°C 9.3 N/mm2
Tensile Modulus
Tensile Modulus
Tensile modulus is a mechanical property that measures the stiffness of an elastic material. It is the slope of stress / strain curve of a material under direct tensile loading.

It can be used to predict the elongation or elastic deformation of an object as long as the stress is less than the tensile strength of the material. Elastic deformation is caused by stretching the bonds between atoms and the deformation can be reversed when the load is removed.

Tensile modulus is affected by temperature and is an important engineering attribute since we generally want to keep elastic deformation as small as possible.
Tensile Modulus @-65°C 3,600 N/mm2
Tensile Modulus @150°C 3,000 N/mm2
Tensile Modulus @25°C 3,400 N/mm2
Tensile Modulus @250°C 2,300 N/mm2
Thermal Properties
Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE)
CTE (Coefficient of thermal expansion) is a material property that is indicative of the extent to which a material expands with a change in temperature. This can be a change in length, area or volume, depending on the material.

Knowing the CTE of the layers is helpful in analyzing stresses that might occur when a
system consists of an adhesive plus some other solid component.
Coefficient of Thermal Expansion (CTE), α1
Coefficient of Thermal Expansion (CTE), α1
CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg).

It explains how much a material will expand until it reaches Tg.
41 ppm/°C
Glass Transition Temperature (Tg)
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
240 °C
Thermal Conductivity
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.

Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
2 W/m.K

Additional Information

These are close alternatives that we have found to work in the same applications that 71-1 used to work. Even though they have a range of different chemistries they have been tried from 71-1 users and some of them like 8600/8700, JM7000 have proven to be almost drop in solutions with some fluctuations in Thermal conductivity

The peak temperatures for most of these products are very similar to 71-1 so most ovens should be able to handle them. Additionally there are single cure options that are easier to work with and process than the 71-1 Polyimide chemistry.

Product Name Viscosity (mPAs) Thixotropic Index CTE a1 (ppm/°C) Tg(°C) TC (W/mK) Modulus @25°C (N/mm2) Moisture absorption (%) Ionics (Cl-, K+, Na+) CVCM (%) TML (%) Cure (min + °C)
LOCTITE ABLESTIK 71-1 14,000 2.9 41 240 2 3,400 0.6 5/5/5 0 0.25 30 + 30 Ramp and Hold @150 + 175
LOCTITE ABLESTIK JM7000 9,000 - 33 240 1.1 - - 10/15/15 0.01 0.15 30 @150
LOCTITE ABLESTIK 8600 7,500 4.7 46 187 3.9 9,600 - 10/10/10 - - 30 + 15 Ramp and Hold @175
LOCTITE ABLESTIK 8700E 18,000 3 45 160 1.6 4,414 0.62 35/5/0 0 0.3 120 @121
LOCTITE ABLESTIK QMI529HT-LV 16,000 4 62 36 8 4,910 - 10/10/10 0.03 0.14

30 + 60 Ramp and Hold @175

LOCTITE ABLESTIK 8064T 12,000 5.8 47 44.5 22 5,260 - 10/10/10 0.05  0.25

60 + 60 Ramp and Hold @180

LOCTITE ABLESTIK 8068TB 11,500 5.5 25 25 100 12,500 0.21 20/0.5/1.5 - - See TDS 
LOCTITE ABLESTIK 8700K - - 20 165 - - 1.98 50/5/10 0 0.59 60 @175
LOCTITE ABLESTIK 84-1LMISR4 8,000 5.6 40 120 2.5 3,900 0.6 20/10/10 - - 60 @175
LOCTITE ABLESTIK QMI519 9,000 4.2 40 75 3.8 5,300 - 20/20/20 - - 15 @185


Some insight:

LOCTITE ABLESTIK 84-1LMISR4 is a product was born 30+ years ago (maybe more) by Ablestik and is still the top sales product of Henkel Electronics material by far. It provides an array of flexibilities from multiple Henkel factories, production frequencies to syringe sizes.

LOCTITE ABLESTIK QMI519 is also a volume runner, a little pricey but its robust Hybrid BMI/ Acrylate properties can enable upgraded performance device.

LOCTITE ABLESTIK JM7000 is a cyanate ester used almost exclusively for hermetic packaging so it can, in principle, work great as a replacement for 71-1.