maximum reinforcement this weight ratio of colloidal silica wollastonite may vary from 0 5 to 1 2 thirdly the minimal amount of sugar should preferably be 25 by weight with respect to the total weight of the suspension so that the u201c b stage u201d fabric see the following description be easy to handle without generating dust and have the requested rigidity the weight ratio of sugar to the total amount of colloidal silica wollastonite and sugar should preferably range between 0 55 and 1 0 the colloidal silica that is used is preferably the one sold by dupont de nemours under the trademark ludox cl p u00ae this colloidal silica contains 30 of solids in suspension in water other colloidal silicas could also be used provided that they do not affect the requested viscosity of the suspension the wollastonite that is used should have the smallest possible granulometry possible inasmuch as it is intended to be used as a coating onto fibers preferably use should be made of the wollastonite sold by nyco under the commercial tradename wollastonite 1250 the sugar that is used is a fine sugar as it can be found in any food store to prepare the suspension the wollastonite sugar and water are preferably mixed first in a hobard u00ae mixer for 5 min the colloidal silica preferably ludox cl p u00ae is then added and the mixture is homogenized for 5 min the suspension of colloidal silica and wollastonite in the sugar solution is then ready to be used its life span is about without 10 h a slight stirring should be maintained in order to avoid sedimentation problems the second step b of the method according to the invention consists in depositing.