Retsch jaw crushers are suitable for rough and preliminary crushing of medium hard, brittle and hard/tough materials. Their safety, reliability and heavy duty capability make them ideal for crushing samples fed into the hopper in large pieces. They have also proved their merit in the preparation of small to medium quantities of recycling and production material and for integration into sample preparation systems. A special feature of Retsch jaw crushers is an infinitely adjustable gap in the range 1- 40 mm which produces a final grain size optimally adapted to requirements.