From: Po-Yung Lu <lupyproject**At_Symbol_Here**GMAIL.COM>
Subject: [DCHAS-L] silica gel
Date: July 6, 2012 10:44:41 PM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <002d01cd5bea$78de4580$6a9ad080$**At_Symbol_Here**>



Any volunteers, please, tell me the uses of these forms of silica gel listed below:

The forms of amorphous silica for which there are or have been health standards are * ditomaceous earth-calcined,
* diatomaceous earth-uncalcined,
* precipitated and gel,
* fumed, and
* fused. 

fumed is the only one that has no NIOSH, MAK, OSHA, of AIHA standard and the TLV was withdrawn. 







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