Determining actual safety from a vague material safety data sheet
General common sense should always remind you not to drink the liquid stick your finger in it, rub it all over your skin or breathe its vapours for extended periods of time. Paracelsus is best known in Germany for this quote:


  All things are poison and nothing is without poison; only the dose allows that a thing is not a poison.


If you are now scared out of your wits, then please relax and consider that preface a general disclaimer. Because all the toxicologic data I can see points towards the liquid being entirely harmless. Here’s why:



  Acute Toxicity: LD 50/oral/rat: >20000 mg/kg


That’s more than $20~\mathrm{g/kg}$ — an incredible number for $\mathrm{LD_{50}}$ values. Usually, the highest $\mathrm{LD_{50}}$ values I see are $2~\mathrm{g/kg}$. And the greater than basically means ‘we couldn’t kill the rats with that oral dose so we gave up.’

  Low oral toxicity proprietary antifreeze formulation based on refined vegetable extracts and non-toxic corrosion and scale inhibitors. Classified as GRAS (Generally Regarded as Safe) as a food additive and not classified as harmful for handling or transport purposes. However we recommend good working practices are employed and personal protection gear is worn when handling any chemical.


(Emphases mine) As you can see, there are numerous references to ‘nope, this thing really won’t harm you.’ The GRAS classification actually seems to be concerning food additives. No danger here.

  Respiratory Protection: Respiratory protection if there is a risk of exposure to high vapour concentrations.


I’ll admit, this sounds a tad unsafe at first glance. But if you know what MSDS write for truly unsafe compounds, you’ll realise that this is saying ‘If we write “safe”, somebody will stick their nose in, suffocate and then sue us, so we have to put some kind of caveat here.’


The only thing that actually hints at a potentially harmful substance is the thing about high vapour concentrations. But remember that this is a cooling liquid; you don’t want a cooling liquid evaporating away, that would reduce the cooling efficacy. The minute amounts you are losing will dilute well in the air in your room. Open the window once a day or every two days and you’ll have removed anything that can potentially harm you. The liquid is as safe as it gets.

However, don’t sue me if you decide to turn off common sense and start drinking the liquid or stop venting your room or whatnot.