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Specialist Materials for Industry and Science

Etch Resist

Etch Resist

Apiezon Wax W and Etch Resist

Apiezon Wax W is an ideal etch resist. Apiezon Wax W is perhaps most extensively used as an etch resist in the electronics industry for both semi conductor and printed circuit boards.

Apiezon Wax W’s wide operating temperature range and low vapour pressures mean it also has an excellent track record in many other different applications, and is the most versatile product in the Apiezon Wax range.

Excellent Etch Resist Properties

Also known as 'Black Wax', Apiezon Wax W has an excellent resistance to etching fluids up to 75°C in all sorts of etchants, including KOH, TMAH, EDP, HF, HNO3, NaOH and acetic acid, but can still be easily removed using hydrocarbon or chlorinated solvents.

The powerful 'gettering' qualities of Wax W also mean that during post-etch cleaning steps, impurities which may have remained on the surface if a solvent were used in isolation, are also removed with the wax.

Furthermore the hydrocarbon formulation and very 'clean' meltdown properties of the wax ensure that unwanted etching contaminates are not introduced into the system.

Benefits of Using Apiezon Wax W as an Etch Resist

  • Etch fluid resistant
  • First-rate vapour pressure characteristics
  • High purity combined with powerful ‘gettering’ & clean meltdown properties
  • Excellent waterproof medium
  • Easy to use and to remove
  • 10 year shelf life

If you have any questions regarding the use of Apiezon Wax W as an etch resist or hard vacuum sealant, we provide extensive online technical information and our team of experts are available to answer your questions via our Technical Helpline +44 (0)161 864 5409 or contact us.



  • Apiezon
  • Metrosil
  • Midel
  • Wolfmet

Products of M&I Materials Ltd.