and crosshead speed was 0 20 in min a 20 to 50 pound load range was used depending on the strength of the sample the dry strips 3 4 samples were then broken with average dry tensile reported in pounds inch for wet tensiles the 1 2 strips were soaked in tap water for 30 minutes blotted and immediately clamped into the instron instrument conditions for wet tensiles were the same as dry tensiles except a 10 pound load range was used again 3 4 samples were run and the average wet tensile strength reported in pounds inch samples were prepared according to the previously described sample preparation section using polyvinyl alcohol 10 vinylamine pvoh vam a fully hydrolyzed medium molecular weight water soluble copolymer from air products and chemicals samples were prepared at a coat weight of 8 with and without glyoxal n 40 from american hoechst added at 15 dry based on dry polymer results showed the pvoh vam copolymer with no glyoxal n 40 addition improved all paper properties tested except gurley porosity when compared to untreated whatman 4 filter paper all gurley porosity values are very low and comparable when 15 glyoxal n 40 was added all wet strength properties improved even much more over the untreated filter paper the glyoxal n 40 treated samples also showed large improvements over samples without the glyoxal n 40 especially in wet strength.