Comments period on draft Kick-off levels 2014 ends on December 1, 2014

In April and June of this year we presented the newly derived draft kick-off levels at conferences of professional associations of occupational hygienists in the Netherlands, Great Britain and the United States. Also, we posted the draft kick-off levels on our website. The draft kick-off levels are recalculated with H-phrases instead of R-phrases. New classifications of risk categories, based on H-statements, are also applied.


We have stated that the new kick-off levels should be seen as a concept and that all comments are welcome. The comments period will close on December 1, 2014. The received comments will then be processed into the publications that we are currently working on, and also in the next update (2015-01), which will appear early January 2015.


So, if you still want to add comments, please do so before December 1, 2014 via email to

Ending the support of Windows XP

Since Microsoft has ended the support for the Windows XP platform since the beginning of this year, it is now time for DOHSBASE to do likewise in DOHSBase Compare. This will allow us to make new improvements in the base program (the part that you use to look for data and make analyses).

We intend to implement the first improvements with the next update: 2015-01. This means that per January 2015 our support for Windows XP will cease.

If you expect to encounter problems with our improvement action, please contact us and we can see how we can help you find an intermediate solution. Please contact us in that case at

CAS-numbers amended for several substances

For a limited number of substances the same CAS-number applies to the pure substance and to the substance in an aqueous solution. The European Union has than two Index-numbers assigned to the same CAS-number. Other substances are available in different physical forms (large or small particles, for example), or with or without a “mixing component”. Also in these cases two Index-number ate assigned to the same CAS-numbers.


IN DOHSBase Compare the CAS-number is our unique key. To avoid problems with the uniqueness of the CAS-number we have chosen fore these situations to change the last digit of the CAS-number (a checksum) to the %-sign for the aqueous solutions, and the letter i for the substances with two physical states.


F.i.: the CAS-number for “Hydrogen chloride” is 7647-01-0 (with Index-number 017-002-00-2), and for “Hydrochloric acid … %” the CAS-number 7647-01-% was assigned by us (with Index-number 017-002-01-X).


OELV’s and measurement methods are only associated with the “original” CAS-number, without % or i in the checksum.


This list shows all substances with and % or i as the checksum in the CAS-number.

Kick-off values discussed publicly with colleagues

The kick-off values ​​have been given a clear place in the Dutch OEL policy in the last years. In recent months we have been working on a reassessment of the original kick-off values ​​from 2005. This has led to the publication of new draft kick-off values ​​in 2014 (see: In the months of April and June, the new kick-off values ​​will be publicly discussed at three associations for occupational hygiene in the Netherlands, the United Kingdom and the United States.


The first time will be at the conference of the Dutch Occupational Hygiene Society (NVvA; on April 2 and 3, 2014. Secondly, at the conference of the British Occupational Hygiene Society (BOHS, on April 8 to 10, 2014. And finally in the United States during the AIHCe (a joint conference of ACGIH and AIHA,


Following these discussions, we will use the comments and improvement of our colleagues in finalizing the the kick-off values ​​2014 to final adoption.