DMSO

99% DMSO is not diluted.70% is diluted.both are DMSO.the dilution may be water,aloevera .stick with water dilution.I dilute to 50-60% DMSO.even 70% DMSO will burn skin.

99% DMSO is the concentration ratio .the rest is water of TOTAL SOLUTION in bottle.the DMSO is 100% DMSO.

In other words,in the bottle is 99.9% ( pure 100% DMSO,,) + 1% water.=100 % total solution in bottle.

.1% water

I have a bottle of DMSO from WPS4SALE. It says 99.9% Pure. But the dilution is 70/30 (which is all they sell) even though it does not state so on the bottle. You should check with the company you bought the DMSO from.

In other words, in the bottle is 99.9% (pure 100% DMSO) + 1% water = 100 % total solution in bottle.

That is not correct. The 0.1% part is something other than pure DMSO; impurities.

Distilled water is not an impurity. Adding DW will dilute the DMSO, not introduce impurities.

The following from hannelore.sander is correct:

I have a bottle of DMSO from WPS4SALE. It says 99.9% Pure. But the dilution is 70/30 (which is all they sell) even though it does not state so on the bottle. You should check with the company you bought the DMSO from.

Recall that MMS2 % of calcium hypochlorite commonly varies from ~58% to ~73%. The rest are impurities.

I buy from my Keavys corner - I know theirs is good - they are on Jim Humbles approved supplier list.
I would not want to buy from any other kind of place, even if one could find it cheaper and I don't think that's possible. I have no worries.
Glenda

I bought my DSMO bottle in a horse supply shop. The next day when I wanted to use it, it had solidified. That would mean, that it is not diluted, because water would not turn to ice at 16 degrees Celsius. The MSDS lists the Melting Point of DSMO at18.4 degrees Celsius/65 degrees Fahrenheit. So if you are not sure if you have bought diluted DMSO just sit your bottle in the fridge and observe what happens

Excellent observation.