Bremthaler Quarzitwerk GmbH (BQW) has over more a half century of experience in mining and processing quartz.
Today BQW's high purity quartz products are crushed, milled and purified from ore originating from own mine near Usingen, Germany, or from imported high grade lump quartz.
All BQW products such as high grade sands, flours and fillers are marketed under the registered brand name SipurTM.
