| Thinner #1 â 50* - 70* temperature range |
| 25% Light Alaphatic Hydrocarbon Solvent 64742-89-8 3.9 |
| 33% Toluene 108-41-4 1.5 |
| 0.9% Ethylbenzene 100-41-4 0.7 |
| 5% Xylene 1330-20-7 0.75 |
| 4% Methanol 67-56-1 3.5 |
| 10% 2-Propanol 67-63-0 1.7 |
| 21% Acetone 67-64-1 7.7 |
| 1% 2-Butoxyethyl Acetate 112-07-2 0.03 |
| Thinner #2 â 60* - 80* temperature range |
| 66% Toluene 108-88-3 1.5 |
| 7% 2Methyl-1-propanol 78-83-1 0.63 |
| 2% 2-Butoxyethanol 111-76-2 0.1 |
| 10% Methyl Isobutyl Ketone 108-10-1 1.6 |
| 15% Isobutyl Acetate 110-19-0 1.45 |
| Thinner #3 90* â 110* temperature range |
| 10% 2-Butoxyethanol 111-76-2 0.1 |
| 20% n-Butyl Acetate 123-86-4 1.0 |
| 70% 1-Methoxy-2-Propanol Acetate 108-65-6 0.39 |
| Thinner #4 â Extreme Duty Temperature range |
| 100% 2-Butoxyethanol 111-76-2 0.1 |
The reason for the CAS number is to clarify which chemical is which. These numbers are unique whereas the chemical names are not. It is not unusual for different manufacturers to have their own brand names. The names will change but the numbers will not. Sometimes that is a good thing. For example, p-Chlorobenzotrifluoride is commonly known as Oxsol 100 if for no other reason than that it is easier to pronounce.
Take a look at the last number in each line. This is the numerical evaporative rate of that chemical. This rating system always compares chemicals to n-Butyl Acetate, which is always regarded as 1. The lower the number, the slower it evaporates. The higher the number, the faster it evaporates. Thus, acetone has an evaporative rate of 7.7 and 2-Butoxyethanol is 0.1. Acetone evaporates much faster than 2-Butoxyethanol. You may know this chemical by the name Butyl Cellosolve.
The point of all this is to quantify how these chemicals will work together to affect the application of the coating. Acetone is a very fast evaporating solvent. It is not going to hang around very long on a warm day and help the coating to remain liquid. Butyl Cellosolve, by contrast, is going to hang around the longest. To that chemical, in this blend, we will give the designation of being the âtail solvent,â the last one to leave. This is the one that will affect how quickly to coating will tack up and dry. The higher itâs concentration in the blend, the slower that this event will come about. (Look for more information on chemical blends in finishing blog.)
Until next time, spray on!
Bernie Bottens writes and teaches on the subject of wood finishing in industrial woodworking. Based in Vancouver, WA, he teaches wood finishing to shop owners, shop foremen, spray technicians and finishers all over the Pacific Northwest. Bernie is the owner of Kapellmeister Enterprises Inc. He can be reached at [email protected].
Read the previous wood finishing blog by Bernie Bottens>>
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