products of the invention form the basis of a satisfactory one shot sizing system sizing is possible in a ph band from 4 5 to 7 4 the shelf life of the products is extremely good the sizing agents having at least a 10 week minimum shelf like at a preferred solids level of 27 acceptable formulations can be made both as to stability and process runnability good efficient sizing is possible at ph 7 0 and above when sodium aluminate is used at the ph control medium the use of retention aids in the paper stock increases product efficiency chalk loadings of up to 17 5 can also be utilised with good sizing while the simultaneous use of a retention aid further increases the sizing efficiency at the higher chalk loading levels these results were obtained by using the above sizing system at a solids level raised to 27 when cobb values of 23 3 were found the cationic emulsion was then changed to a product based on 34 roscol 34 for instance the paper sizing agent of the above example 7 iii to evaulate its efficiency against conventional emulsion based products after a 30 minute period the emulsion was again changed to the original bumal based product chalk loading was added at levels from 5 0 to 17 5 however as there was no conventional retention.