LOCTITE ECCOBOND FP4526
- Low viscosity
- Excellent wettability
- Hi-Pb and Pb-free applications
LOCTITE® ECCOBOND FP4526 epoxy underfill is designed for capillary flow on flip chip applications. It's fast flow and low viscosity along with its excellent wettability and adhesion make it ideal for high reliability applications.
LOCTITE® ECCOBOND FP4526 is a heat curable 63% filled underfill that can be used on ceramic, organic, solder mask and polyimide substrates and is typically used for Ceramic packages and FC on flex applications.
- 15 minutes @ 165°C(Heat sink or hot plate cure)
- 30 minutes @ 165°C (Convection oven)
| Pot Life
Pot life is the amount of time it takes for the viscosity of a material to double (or quadruple for lower viscosity materials) in room temperature after a material is mixed.
It is closely related to work life but it is not application dependent, less precise and more of a general indication of how fast a system is going to cure.
| 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.
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
The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
| 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.