Project Description

silica spacers

Silica spacer is widely used for frame gap control, as well as cell gap control for special applications. EPRUI supplies silica spacers with perfect spherical morphology, precisely controlled particle size, narrow particle size distribution, excellent resistance against heat, cold and chemicals and great mechanical strength and superior crush resistance.

EPRUI supplies two types of high quality silica spacers: Si and SiS. Our Si type is mainly used as side spacer while SiS series is used to control cell thickness inside.

Specification Result Test Method
Mean Diameter ±0.05um Coulter Counter
CV. % <3% Coulter Counter
10% Modulus of elasticity >4000 kgf/mm2 Shimadzu MCT210
Density 2.1 g/cm3 Multi Volume Density Test
Refractive Index 1.46 20℃ λ=589nm
Thermal Decomposition Temperature >2200℃ in air /
Volatile Components <1% 105℃*1hr

Type Product CV Diameter Application
Si EPRUI-SSi <3.5% 2.0-20.0um Side Spacer
SiS EPRUI-SSiS <3% 2.0-20.0um TN,STN

Impurity control

The amounts of ions in our silica spacer are critical and tightly controlled in the entire manufacture processing. The amount of Fe, Ca, K, Na is detected by ICP spectrometer and Cl by ion chromatography.

Substance Control Limit Test Method
Fe ≤2 ppm ICP Spectrometer
Ca ≤2 ppm
K ≤2 ppm
Na ≤2 ppm
Cl ≤1 ppm Ion Chromatography

EPRUI’s silica LCD spacers meet ROHS requirement

EPRUI supplies silica spacers not containing any chemicals prohibited by RoHS. Our silica spacer products are inspected every year by an internationally certified agent to meet all RoHS requirements. The RoHS certification copy can be sent upon request.

Substance Test Result(N.D.=Not Detectable)
Cd N.D.
Pb N.D.
Hg N.D.
Cr6+ N.D.
PBBs N.D.
PBDEs N.D.


Recommended Spraying Method:

  1. EPRUI-SSi type silica spacer is used as side spacer, it can be mixed directly with other ingredients.
  2. In case of cell gap applications, EPRUI-SSiS silica spacers can be either dry or wet sprayed. Dry Spray : in order to get best effect, it is recommended to vacuum dry silica spacers at 80 °C for 8 hrs (caps off) before dry spraying, which ensures spacer microspheres disperse smoothly and freely. Wet Spray: Disperse the silica spacers in organic solvent such as isopropanol or ethanol, ultrasonicate a while before adding proper amount of water. This usually works better than dispersing the microbeads directly in aqueous solution containing of organic solvent.

Recommended spraying density:

Silica LCD Spacers TN STN
Spraying Density 40-100 particles/mm2 80-200 particles/mm2

  1. 10g or 20g glass vials with plastic caps and inserts to keep moisture away from the contents. PET vials of 10 g or 20 g are also available upon request.
  2. The label on the vial includes product name, lot number, expiration date, weight, RoHS, inspection passing stamp, etc.
  3. The vials should be stored in dehumidifying cabinets with controlled temperature and humidity. The cabinet should be set at room temperature and kept under 25% humidity. It is recommended to use up the entire product in a vial once it is opened.