Dispersion Impregnation of Flax and Polyaramide

Equipment for impregnating asbestos is conceptually similar to those used for glass cloth coating. Asbestos readily picks up PTFE dispersions and the amount of uptake depends on the concentration of PTFE in the dip tank. The dispersion may be diluted moderately with deionized water or substantially using a dilute aqueous solution of a nonionic surfactant such as Triton X-100. The speed of the asbestos yam movement through the dip tank has little effect on the amount of uptake. The length and capacity of the oven determines the maximum throughput of the process. 

After dipping, the asbestos is dried in an oven (80°C-90°C) followed by calendaring to smooth the surface. 

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