Repellix SuperHydrophobic Ceramic Coating

A Force Field Against Accidental Immersion

Two side-by-side cellphone PCB’s are immersed into water. The Repellix coated PCB (right) appears silvery,
as if a force field were pushing the water away. What we are observing is the reflection of light from the air/water meniscus layer surrounding the Repellix coated board.

As the Repellix board is removed, it remains completely dry, in contrast to the uncoated PCB which wets from the immersion.

Different angles show the effect from alternative viewing conditions.

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Super-Hydrophobic Contact Angles

contact angle silicon

Silcon Wafer
58 Degrees


Self Assembled Monolayer
128 Degrees

contact angle repellix

146 Degrees




Self Assembled Monolayer
91 Degrees

contact angle repellix

147 Degrees
Advancing Angles
Receding Angles


In an independent test, Repellix was compared with a vapor deposited C10 fluorosilane hydrophobic self assembled monolayer (SAM) coating on silicon. The contact angles were noticeably different, with Repellix offering the highest angle. The static water contact angles were: Untreated silicon= 58o, the C10 SAM= 110o and Repellix= 147o. The Goniometer images for the advancing and receding contact angles showed Repellix to have superior performance with a 1 degree hysteresis while the SAM exhibited a delta of 37 degrees.

Repellix is an exciting new technology that offers:


While retaining the ability to


Without the extra costs of:

  • Gaskets, seals, and rubber skins
  • Masking the boards in production

Refellix Introduction

Introduction to Repellix Coating