Selective Conformal Coating Machine

Selection criteria

Valve types (spray / film / needle), positioning accuracy, thickness control, UV inspection, curing.

Supply chain

Dongguan and Shenzhen have mature makers of selective conformal-coating lines, including a listed fluid-dispensing company. Check edge accuracy next to connectors and the actual film thickness on component corners.

Buyer FAQ

What coating thickness should I specify?

IPC-A-610 gives typical dry-film ranges of about 30–130 µm for acrylic and polyurethane and 50–210 µm for silicone. Measure on test coupons coated alongside production, using an eddy-current gauge or a wet-film gauge corrected for solids content. Also check sharp component corners and edges, where coating is thinnest.

Which valve type should I choose?

Atomising spray valves cover large areas quickly but have soft edges; film (curtain) valves give sharper edges, often within about 0.5–1 mm of a keep-out zone; needle valves handle tight spots next to connectors. Most lines combine two or three valves, and a tilt or rotate axis helps coat component sides. Specify positioning repeatability of about ±0.05 mm or better.

How are coating coverage and curing checked?

Most coatings contain a UV tracer, so coverage and contamination of keep-out areas are checked under UV light, manually or with automatic optical inspection. Curing may be room-temperature, oven or UV; UV-cure coatings need a secondary moisture or heat cure for shadowed areas under components. Watch for bubbles, wicking into connectors and solvent fumes that need extraction.

Where it is used