NITAL-ETCHING ACCORDING TO ISO 14 104 OR AMS 2649
The effect of nital-etching depends on various factors. The condition of the etch bath is highly decisive. By our experience it is not sufficient to check this referring to its cleanliness, contamination and pH level only. For this reason ISO 14 104 as well as AMS 2649 stipulate a regular undisclosed employment of reference blocks during the running testing process which allow an assessment of the etch bath’s efficacy.
For this purpose imq has developed specific reference blocks which realize highly reliable performance. Due to this, etch baths do not need to be replaced according to course of time but exactly then when they have become ineffective indeed.