<div>Many thanks Stephan </div> <div>I understand that but i want perspex definition with density of 2.5 gm/cm3.</div> <div> </div> <div>Can anyone help please?</div> <div> </div> <div>Margaret Stephan Schneider <sts@rheinahrcampus.de> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi, Perspex also known as PMMA is almost similar to the definition of plastic in the GateMaterials.db. The molecular structure is (C5-O2-H8)   Plastic:  d=1.18 g/cm3 ; n=3; state=solid         +el: name=Carbon ; n=5         +el: name=Hydrogen ; n=8         +el: name=Oxygen ; n=2 In the literature the density is defined as 1.19g/cm3, so you could either use plastic or add a new material. Cheers, Stephan On 04.01.2008 17:12 Uhr, "Margaret Morris" <drpetuk@yahoo.com> wrote: <BLOCKQUOTE>Hi All,         has anyone tried to define Perspex material? I will appreciate if someone can send to me the definition of perspex.         Margaret    <HR align=center width="100%" SIZE=1> Looking for last minute shopping deals?  Find them fast with Yahoo! Search. <A href="http://us.rd.yahoo.com/evt=51734/*http://tools.search.yahoo.com/newsearch/category.php?category=shopping"><http://us.rd.yahoo.com/evt=51734/*http://tools.search.yahoo.com/newsearch/category.php?category=shopping></A> <HR align=center width="95%" SIZE=3> _______________________________________________ Gate-users mailing list Gate-users@lists.healthgrid.org <A href="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</A> </BLOCKQUOTE> </BLOCKQUOTE> <hr size=1>Be a better friend, newshound, and know-it-all with Yahoo! Mobile. <a href="http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ "> Try it now.</a>