LOCTITE 3128

Harmonization Code : 3907.30.00.90 | Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other

Main features

One component
Low temperature cure
Bonding heat sensitive components

Product Description

LOCTITE 3128 is a one part, heat curable epoxy designed to cure at low temperature and gives excellent adhesion on a wide range of materials in considerably short time. Typical applications include Memory cards, CCD/CMOS Assemblies and Lid/Cap attach for automotive optical sensors and 3d sensing modules.

LOCTITE 3128 can be successfully used as an Edgebond underfill, particularly suited where low curing temperatures are required for heat sensitive components. This low halogen, high viscosity, heat curable epoxy has a good adhesion to a variety of surfaces and a whopping 3 weeks of pot life.

LOCTITE 3128 has a fairly low CTE and warpage and as such has also been used on finger print sensor encapsulation with positive results. This is a camera/sensor market material so is not expected to pass very harsh reliability requirements.

Recommended cure schedule

20 minutes @ 80°C bondline temperature
60 minutes @ 60 °C bondline temperature

Note: Sufficient time must be added to allow the bond location to reach the desired cure temperature. Curing profiles should be developed for each device.

Product Family
3128

1. Select Package Type

30cc Syringe 10cc 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 12 weeks

Contact for Pricing

Packaging

TDS, SDS & Technical documents

Specifications

Technical Specifications

General Properties

Specific Gravity

Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.

1.6

Outgassing
CVCM CVCM Collected Volatile Condensable Materials	0.01 %
TML TML Total Mass Loss	0.4 %

Shelf Life
Shelf Life @ -20°C	365 days

Thermal Properties

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.

45 °C

Coefficient of Thermal Expansion (CTE)
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.	40 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.	130 ppm/°C

Mechanical Properties

Elongation

Elongation
Elongation is the process of lengthening something.

It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks.

It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.

2.3 %

Tensile Modulus
Tensile Modulus @25°C	22,000 N/mm2

Hardness
Durometer (Shore D)	88

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

27,000 mPa.s