Title (en)

METHOD FOR REDUCING AND CONTROLLING HEXAFLUOROSILICATE CONCENTRATION DURING THE POLISHING OF GLASS OBJECTS IN A POLISHING BATH CONTAINING SULPHURIC ACID AND HYDROFLUORIC ACID

Title (de)

VERFAHREN ZUR VERMINDERUNG UND KONTROLLE DER HEXAFLUOROSILICAT-KONZENTRATION BEIM POLIEREN VON GLASGEGENSTÄNDEN IN EINEM SCHWEFELSÄURE UND FLUSSSÄURE ENTHALTENDEN POLIERBAD

Title (fr)

PROCEDE PERMETTANT DE REDUIRE ET DE SURVEILLER LA CONCENTRATION EN HEXAFLUOROSILICATE LORS DU POLISSAGE D'OBJETS EN VERRE DANS UN BAIN DE POLISSAGE CONTENANT DE L'ACIDE SULFURIQUE AINSI QUE DE L'ACIDE FLUORHYDRIQUE

Publication

EP 1515923 A1 20050323 (DE)

Application

EP 03740288 A 20030618

Priority

• DE 10228116 A 20020624
• EP 0306487 W 20030618

Abstract (en)

[origin: WO2004000747A1] The invention relates to a method for reducing and controlling the concentration of hexafluorosilicate ions arising when glass objects are polished in a polishing bath containing sulphuric acid and hydrofluoric acid. Potassium floride, potassium sulphate, sodium fluoride, sodium sulphate or aluminium sulphate is added to the polishing bath or sulphuric acid rinsing bath in quantities such that a drop in the concentration of fluoride ions below the optimum working range is avoided.

IPC 1-7

C03C 15/02

IPC 8 full level

C03C 15/00 (2006.01); C03C 15/02 (2006.01)

CPC (source: EP US)

C03C 15/02 (2013.01 - EP US)

Citation (search report)

See references of WO 2004000747A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2004000747 A1 20031231; AU 2003279390 A1 20040106; CN 1662464 A 20050831; DE 10228116 A1 20040129; EP 1515923 A1 20050323; JP 2005534595 A 20051117; US 2005230355 A1 20051020

DOCDB simple family (application)

EP 0306487 W 20030618; AU 2003279390 A 20030618; CN 03814763 A 20030618; DE 10228116 A 20020624; EP 03740288 A 20030618; JP 2004514796 A 20030618; US 51816204 A 20041214