This standard applies to internal mixers for rubber and plastics as defined in 3.1. The safety requirements and/or measures specified in this standard apply to all internal mixers irrespective of their size and irrespective of the control modes of the hopper front door and discharge door. The safety requirements for the design of exhaust systems and ancillary equipment are not covered by this standard. The safety requirements for the interaction between internal mixers and ancillary equipment are specified. This standard covers the significant hazards listed in Clause 4. This standard is not applicable to internal mixers which are manufactured before the date of publication of this standard by CEN.