Alternate Names: Additive A, Additive
The manufacturer claims: "Lignin products have lubricating, binding and anti-scumming properties in ceramics. They provide benefits to stiff mud and soft mud face bricks, engineering bricks, refractories, sewer tiles, roof tiles, ramming and gunning mixes, terracotta ware, whiteware and throwing bodies.
Improved clay workability
Reduced need for die lubrication
Increased extrusion rate
Increased life of wearing parts
Increased green strength
Reduced free water
Faster drying rates
Reduced energy consumption
Flexibility to use less plastic clays".
Some companies (e.g. Old Hickory Clay) use this as an alternative to shrink-wrapping every pallet of bagged materials (for environmental reasons for example). This wood derivative material is very sticky and behaves like a glue. However it redissolves quickly when whetted. Dark hard particles of this glue can be a concern in batching operations where they fall into the mix. However in a pugmill the particles dissolve during movement through the barrel and are not visible in the extruded product.
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An overview of the major types of organic and inorganic binders used in various different ceramic industries.