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Junta hermética, aplicable especialmente a clavos o tornillos de sujeción de placas de fibrocemento, caracterizada esencialmente por estar constituida mediante una arandela cónica que presenta recubierta su superficie lateral interior y exterior por sendas faldillas de naturaleza metálica maleable, de las cuales la exterior cuenta con un cuello, cilíndrico que pasando a través del orificio de dicha arandela está reblado sobre la faldilla interior, constituyendo el anclaje entre si de dichas faldillas a la arandela.
Menetelmä ammoniakin valmistamiseksi selluloosankeiton jäteliuoksissa olevista orgaanisista aineista ja samanaiakaisesti mainituissa liuoksi ssa olevan emäs- ja rikkisisällön talteenottamiseksi.