Solder Paste
Stencil Coatings

Better paste release. Cleaner prints. Fewer reworks. It starts at the stencil.

The Problem

In SMT assembly, the stencil is where print quality is won or lost. Untreated stencil apertures accumulate paste residue on their walls with every print cycle — gradually degrading release quality, increasing bridging on fine-pitch components, and forcing more frequent underside cleaning stops. The result is lower first-pass yield, higher rework costs, and throughput loss that compounds across a shift.

The Solution

A nano-thin layer on the aperture wall changes everything downstream.

ViriDyn’s stencil coatings apply a nanometre-thin hydrophobic and oleophobic layer to the aperture walls and stencil underside. Solder paste has a fundamentally different relationship with a treated surface — instead of adhering to the aperture wall, it releases cleanly and completely with each print stroke. The paste goes on the pad where it belongs, not on the stencil where it causes problems. The coating is abrasion-resistant, survives thousands of print cycles, and holds up against commercial stencil cleaning solvents. It doesn’t change your process — it makes your existing process perform better. Sensornet stocks both formulations in India, with full application guidance and technical support from day one.

What We Protect

  • Laser-cut stainless steel and electroformed stencils
  • Fine-pitch and ultra-fine-pitch apertures
  • High-density and mixed-technology board assemblies
  • Stencil underside —reducing paste bleed and smearing
  • Aperture walls — enabling clean, complete paste release every print

What Changes

Improves:

  • Solder paste release from aperture walls
  • Paste transfer efficiency — more paste goes on the pad, less stays in the stencil
  • Print quality on fine-pitch and high-density boards
  • First-pass yield rates
  • Cleaning efficiency — paste wipes off faster and more completely

Reduces:

  • Solder bridging on fine-pitch components
  • Underside cleaning frequency — from every 8–10 prints to every 25–30
  • Stencil replacement frequency
  • Rework and scrap rates
  • Total paste consumption per board

✦ Authorised ViriDyn Partner

✦ Locally Stocked in India

✦ Application Engineering Support

✦ 10 Years of Domain Expertise

Recommended Products

SMT-GREEN

Hydrophobic, Oleophobic Long-lasting, abrasion-resistant solder paste stencil nano-coating. Resistant to commercial stencil cleaning solvents. Cures rapidly at room temperature. Heat cure optional. Safe and easy to apply — spray or wipe-on.

SMT-GREEN+

Hydrophobic, PFAS-Free The PFAS-free version of SMT-GREEN. Same abrasion resistance, same longevity, same ease of application — with no fluorocarbons. For manufacturers with sustainability compliance requirements or RoHS-aligned procurement policies.

Surface Protection
That Holds Up
Where It Matters.

Talk to us before your next build, deployment, or qualification.

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