Whsmp · OPW16/0021

                                                                                                                                                              Hazardous Substances Register
                                                                                                                                                                                                     HB-HSEQ-F-040
                                                                                                                                                                                                          Version:5


Symbol                                                                                                    Meaning

      √     May be compatible in many cases with exception. Follow the alphabetical compatible goods Guidance notes.

   X        Likely to be incompatible. Segregation strongly recommended, follow the segregation of guidance notes for incompatible goods.

  S1        Segregation of these goods by 3m or more in a well-ventilated area. For liquid dangerous goods the distance is measured from the edge of the spill catchment area.

  S2        Segregation of these goods by 5m or more in a well-ventilated area. For liquid dangerous goods the distance is measured from the edge of the spill catchment area.

  S3        Segregate by 3m or more for PGIII goods and 5m or more for PGII, PGI goods or where the goods may react dangerously. If both are solids then a minimum of 1m separation may be used.
            Where one of the goods is liquid the distance is measured from the edge of the spill catchment area.

  S4        Segregation preferred by the use of fire rated partitioned areas. Consider the use of separate detached building for organic peroxides and for highly phosphoric class 4.2 goods.

  S5        Segregation of class 4.3 preferred by use of a separate, dethatched building without water based suppression system

Letter                                                                                                   Meaning

  A       In most cases materials of the same class will be compatible. SDS should be checked.

  B       In most cases materials of the same class will be compatible. Subsidiary risks should be checked refer to SDS.

  C       If one of the substances present is also a ‘fire risk substance’ (one of class 2.1,3,4,5, a combustible liquid or has a subsidiary risk of one of these) or elevated temperature goods, segregation is
          required by at least 3m or more. Sub-risk MUST be considered. Other exceptions apply. Please check SDS.

  D       Not all class 5.1 goods are compatible as follows: ammonium nitrate and calcium hypochlorite (and its mixtures) are incompatible with most other 5.1. Please check MSDS and contact Safety
          officer before storing any Class 5.1 material.
  E       Organic peroxides are highly reactive materials. Please check SDS before storing to ensure compatibility.
  F       When one of the goods to be stored together is deemed a concentrated strong acid and the other is a concentrated strong alkali, they should be deemed incompatible.

  G       Class 4.3 goods should not be stored next to goods that are in a solution containing water, or where water or foam is the chosen fire fighting/ spill/ leak dispersal or suppression media for the
          storage area.

  H       Except where the class 6.1 cyanide and the class 8 an acid. See SDS.

  I       Toxic gases ammonia and chlorine must be segregated due to risk of explosion. It is important to refer to the SDS for compatibilities within this class/division. It is strongly recommended that
          each different toxic gas (Class 2.3) be segregated unless information on the SDS says otherwise.