[Histonet] Re: paraformaldehyde grade

2008-09-13 Thread Hobbs, Carl
Hi. I am interested in David's post: I too wished to change to Prills for weighing out PFA because the usual crystaline PFA is such a fine powder that it tends to "float" around, when weighing. ( conforming to Health and Safety recommendations by weighing the latter out in a fume hood The p

[Histonet] Re: paraformaldehyde grade

2008-09-11 Thread David A. Wright
Hi Mary, René, & Histonet I agree with René completely about concentration & different paraformaldehyde grades but you might want to consider a couple of other issues too: a) physical state. A coarse prill is much easier to weigh out without contamination than a fine powder. b) filtration. Befor