Project Description

conductive-Au-particleEPRUI Biotech provides high quality gold plated spacers for microelectronic packaging in electronics manufacturing.  With better resolutions and decreasing number of circuit chips or modules in liquid-crystal displays (LCD), the input/output (I/O) density in integrated circuit increases while the size and pitch of the interconnection bumps become very small. Au plated particles are electrically conductive and typically dispersed in a binder to form anisotropic conductive adhesive (ACA) materials such as anisotropic conductive film (ACF) or anisotropic conductive paste (ACP) employed in the connection of microelectrodes. EPRUI supplies gold conductive microspheres have outstanding size uniformity, high conductivity, appropriate elasticity and strong adhesion between the metal layer and the resin core. Designed specifically for vertical connection of fine-pitch electrodes, Gold conductive microbeads are used, for example, in the interconnect between the two glass panels in the fabrication of LCD cells.

conductive gold microspheres

Monodisperse resin particles as core and metallic gold as shell

1. Broad size selection: 3.0 µm − 10.0 µm (in 0.1 µm increment)

2. Uniform in size and shape, coefficient of variation (CV) ≤ 3.5%

3. Good dispersivity, no overlaps or aggregates

4. Suitable hardness for high conduction reliability

5. Low resistance, high stability under heat and humidity

Density 1.7 g/cm3
Coefficient of thermal expansion  10-5 ℃-1 5-7(core); 1.3-1.4(metal)
Volume Conductance ﹤1×10-2

Product Particle Size Increment CV. K at 10% deformation Metal Thickness Metal Content Application
um um Kgf/mm2
GD 7-10um 0.25um ≤3.5% ~450 100-150nm 25-35% LCD Panel
3-6.75um 0.25um ≤3.5% ~500 100-150nm 30-40%
GDL 7-10um 0.25um ≤3.5% ~250 100-150nm 25-35% ACF, ACP
3-6.75um 0.25um ≤3.5% ~300 100-150nm 30-40%

The K value at 10% deformation is defined by the following equation:

K value at 10% deformation

wherein F and S represent a load value (kgf) and a compression displacement (mm) at 10% compression deformation of the particle, respectively, and R represents a radius (mm) of the particle.