Is Your Fragrance Gel Wax Compatible?
Gel wax is 95% mineral oil and 5% polymer, so the fragrance you use needs to be able to mix with mineral oil (Miscible). If the fragrance isn't miscible, then you will get pockets or layers of fragrance oil that may ignite. Not all fragrances will blend, but there's a quick test you can do to check to see if the one you have is.
Step 1 - Flashpoint
Gel wax has a high melt point and the fragrance needs to be able to tolerate that, so any fragrance with a flash point of less than 80C (176F) isn't suitable.
Once you have made sure the flashpoint is sufficiently high, then you need to make sure the fragrance will blend well. For this you need to perform a 'Mineral Oil Miscibility Test'
You will need some mineral oil (liquid paraffin, baby oil etc), a clear container and the fragrance.
Add 1 part fragrance and 3 parts mineral oil to the clear container. Give them a really good mix and leave the container undisturbed for half and hour. If the mixture has separated into two distinct layers, or if the mixture is 'cloudy', then the fragrance isn't suitable.
If the mixture is completely clear, with no layers, move on to the second test, just to make absolutely sure. Add 3 parts fragrance, to 1 part mineral oil and give them a good mix again. allow the mixture to settle undisturbed for half an hour and then check.
If the mixture hasn't separated into 2 layers and isn't cloudy, then the fragrance oil is considered 'Gel wax compatible'!