R
RAG - the two main rag fibres used in paper making are cotton and linen, rag paper consists of 25-60% rag fibre and the rest is chemical wood pulp.
Ream - a term denoting a number of sheets of paper ranging from 480 to 516, most commonly 500.
Relative Humidity - the mass of water vapour actually contained in a given volume of air expressed as a percentage of the maximum mass of water vapour that could be contained in that same volume at the same temperature.
Retention - the percentage of the amount of a loading or additive added to the stock that is retained in the final sheet of paper.
Rigidity - the force required to bend a strip of paper or board through a known angle.
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