LOCTITE ECCOBOND FP4545FC
- High purity
- Rigid, low stress seal
- Good toughness
LOCTITE ECCOBOND FP4545FC epoxy encapsulant designed as underfill and helps dissipate stress on solder joints and extends thermal cycling performance. This material is specially suited for flip-chip devices requiring improved crack/fracture resistance and noclean flux compatibility.
LOCTITE ECCOBOND FP4545FC is a one component, high purity underfill that forms a rigid, low-stress seal. It has good toughness and a filler weight of 55%.
- 60 minutes @ 165°C
- 120 minutes @ 170°C (enhanced performance)
| 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 |
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.