Polymer of vinyl formal, in one of the forms mentioned in note 6 (b) to Chapter 39, of a weight average molecular weight (M<sub>w</sub>) of 25 000 or more but not more than 150 000 and containing by weight:<br> <br><br><br>- 9,5 % or more but not more than 13 % of acetyl groups evaluated as vinyl acetate and<br> <br><br><br>- 5 % or more but not more than 6,5 % of hydroxy groups evaluated as vinyl alcohol<br>
Third country duty