immersed in water it exhibited practically no wet tensile strength as evidenced by the fact that it could not suspend its own weight vinol 205 is a partially hydrolyzed pvoh grade 87 89 hydrolyzed of low viscosity 4 6 cps and vinol 523 is also a partially hydrolyzed pvoh grade 87 89 hydrolyzed of medium viscosity about 23 cps when immersed in a 5 boric acid solution the film exhibited surprisingly good wet tensile strength and was highly elastic however this film removed from the boric acid solution was redispersed in plain water in less than two minutes the treated film in contact with boric acid solution retained wet tensile strength for more than 30 days at 130 u00b0 f 54 4 u00b0 c at 160 u00b0 f 71 1 u00b0 c the film retained wet tensile strength for 3 days indicating excellent film stability and shelf life at the elevated temperatures that may be experienced under storage conditions the same emulsion as employed in example 1 was diluted and applied to a paper substrate the emulsion was diluted with water to a 25 total solids content and applied to both sides of a 42 pound 3300 square foot 19 kg 307 mg square meters paper substrate and.