LOCTITE ABLESTIK 958-7 | Electrically Conductive Adhesive

Harmonization Code : 3506.10.00.00 | 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

LOCTITE ABLESTIK 958-7 | Electrically Conductive Adhesive

Main features

Electrically conductive
Good adhesion to gold
Heat cure

Product Description

LOCTITE ABLESTIK 958-7 is a silver-filled, electrically conductive epoxy adhesive engineered for high-reliability hybrid die attach applications. Formulated for advanced electronic assemblies, this adhesive delivers both strong mechanical bonding and consistent electrical performance, even under thermal and environmental stress.

What sets 958-7 apart is its enhanced adhesion to gold surfaces, making it particularly well-suited for sensitive components in hybrid circuits, semiconductors, and high-density electronics. Its proven track record in reliability makes it a go-to solution for manufacturers that demand dependable electrical conductivity along with robust bond strength.

Typical Applications:

Hybrid Die Attach
High-Reliability Electronics
RF and Microwave Components

Product Family
958-7

1. Select Package Size

3 cc

2. Available Package Type

EFD Syringe

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.

Shortest leadtime

Shipping in 6 - 8 weeks

Contact for Pricing

Packaging

TDS, SDS & Technical documents

Specifications
Additional Information

Technical Specifications

General Properties

Appearance

Appearance
Appearance at room temperature.

Gray

Work life @25°C

Work life @25°C
Work life is the amount of time we have to work with a material until it is no longer able to be easily worked and applied on a substrate.

It is based on the change in viscosity and it can rely on the application requirements.

168 hours

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

Viscosity

Viscosity
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

90,000 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)	105 ppm
Sodium (Na+) Sodium (Na+) The amount of Sodium (Na+) ion extracted from the product in parts per million (ppm)	30 ppm

Water Extract Conductivity

1.5e-7 Ohm

Mechanical Properties

Water Extract Data Water Extract Data Water Extract Data, 20hrs water boil
pH of extract	5.6

Shear strength
Shear Strength @25°C	17 N/mm2

Electrical Properties

Volume Resistivity

Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.

1.0x10^-4 Ohms⋅cm

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.	38 ppm/°C
Coefficient of Thermal Expansion (CTE), α2 Coefficient of Thermal Expansion (CTE), α2 CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg). It explains the extent to which a material will expand after it passes Tg.	120 ppm/°C

Flash Point

Flash Point
The flashpoint of a solvent is the lowest possible temperature at which it can vaporize to form an ignitable vapor.

Flashpoint is often confused with “autoignition temperature”, which is the temperature at which a solvent ignites without an ignition source.

93 °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.

67 °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.

2.0 W/m.K

Additional Information

LOCTITE ABLESTIK 958-7 ADDITIONAL SPECIFICATIONS

Property	Value	Unit
Lap Shear Strength @25℃ (Al to Al)	14	N/mm²
Bond Strength @25℃	39	N/mm²
Bond Strength @25℃ (after 1,000 hours @150℃)	37	N/mm²

Recommended Cure Schedule

1 hour @150°C

Thawing

Allow container to reach room temperature before use.
After removing from the freezer, set the syringes to stand vertically while thawing.
DO NOT open the container before contents reach 25°C temperature. Any moisture that collects on the thawed container should be removed prior to opening the container.
DO NOT re-freeze. Once thawed to 25°C, the adhesive should not be re-frozen.

Loctite ablestik 958-7 Thawing Curve

Directions for Use

Thawed adhesive should immediately be placed on dispense equipment for use.
If the adhesive is transferred to a final dispensing reservoir, care must be exercised to avoid entrapment of contaminants and/or air into the adhesive.
Adhesive must be completely used within the product's recommended work life.
Apply enough adhesive to achieve a 25 to 50 µmwet bondline thickness, dispensed with approximately 25 to 50 % filleting on all sides of the die.
Alternate dispense amounts may be used depending onthe application requirements.
Star or crossed shaped dispense patterns will yield fewerbondline voids than the matrix style of dispense pattern.