Some electronics products require because of the environmental condition (high humidity and/or temperature, presence of inorganic salts) applicatioon of such printed circuit boards for theis construction, which are covered with a special mask resistant against different kinds of fungi and mould. General requirements for solder masks for the printed-circuit boards are formulated in IPC-SM-840C "Standart - Permanent Polymer Coating (Solder Mask) for Printed Boards". A corresponding test method is described in standart: IPC TM-650 - chapter: 2.6.1.1.“Fungus Resistance – Conformal Coating" - test is to be made for following kinds of Fungus:

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Scientific name:                         ATCC code:

Aspergillus niger .............................9642

Chaetomium globosum ...........................6205

Gliocladium virans ............................9645

Aureobasidium pullulans .......................9348

Penicillium funiculosum .......................9644

We can introduce - and apply in our PCB production - fungus resistant PCB solder masks of manufacturers:

• Peters GmbH & Co., KG (Germany)
• GOO CHEMICAL CO., LTD.(Japan)

Useful link to all test methods approved by IPC: www.ipc.org/test-methods