What is a Joker and what is a Pseudo-Substance?
Ans: In the basic substance list in IMDS there are three different types of substances. Since there are limitations in e.g. IMDS Recommendation 001 on how to use these substances it is important to know the difference between them. The following types exist: 1. Regular basic substance – This is a basic substance that has a CAS-No. meaning it is a clearly defined substance. Water (CAS-No. 7732-18-5) is a good example. 2. Pseudo-Substance – A pseudo-substance gives an accurate description of the substance or the substance group but does not have a CAS-No. Some examples are “Acrylic resin” or “Cotton-fibre”. It is important to point out that these substances are accepted as real substances in IMDS and are not considered as wildcards. They are therefore allowed to be used within the 90% disclosure rule according to the IMDS Recommendation 001. 3. Jokers or Wildcards – These substances do not define a specific substance. Examples are “Miscellaneous” or “Not yet defined”. Please note that an
