Exemption for captively used jute yarn and manufactures applies to designated jute products but excludes goods with low jute content. Exempts jute yarn and jute manufactures used captively in the manufacture of specified jute products from the whole excise duty leviable under the Tariff Schedule, covering goods used to make jute blankets, felt, mats and mailings, carpets and bleached, dyed and printed jute fabrics, and applying to goods in Chapters 53, 56, 57 or 63; the exemption is subject to a proviso excluding goods that fail to meet a required minimum jute content by weight.