I mixed by weight a few days ago and my layer was fine... it was my first time though and I think the directions for the product said to mix by volume, but I was in a hurry and didn't have pipets On Mon, Mar 8, 2010 at 2:24 PM, DEBASHIS MAJIwrote: > Dear all, > > I have a small question regarding mixing up of the PDMS base and the hardner > in 10: 1 ratio. Generally it is specified as mixing up of the two in 10:1 > ratio by weight. But can anyone tell me whether their will be a lot of > difference in the PDMS property if one use the ratio of 10:1 by volume ( eg. > 10ml : 1ml ). Normally we can correlate the weight ratio to volume ratio, > but in that case can anyone please tell me the density of the base and > the hardner ? The density of the PDMS is about 0.97 kg/m3 . > > Thanks in advance. > > Debashis Maji, -- Nathan McCorkle Rochester Institute of Technology College of Science, Biotechnology/Bioinformatics