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Tearing
Tearing involves pulling the material with such force that it comes apart. Some materials like fabric, soft metals, plastics, and tires, are more tearable than others. Purpose-built tearing reducers (such as SSI's Primary Waste Reducers) are good for reducing mixed waste where small, uniform particle size is not important.
Fracturing
Some materials are brittle, such as glass, hard plastics, and certain metals, and tend to be broken or shattered in a shredder when the cutters aren't sharp or are loose. Unlike tearing, when something breaks it releases energy explosively, sometimes propelling the shards upwards into the faces of the fascinated onlookers. Always wear eye protection.
Optimum Action
All three actions, shearing, tearing, and breaking are present when a shredder is being used. However, when the cutters are kept sharp and the tolerances tight, the dominant and most efficient reduction action should be shearing.
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