To heat or not to heat -- Not to heat. Please.
It occurs as a white, crystalline powder that is soluble 17 mg/mL in water and 42 mg/mL in alcohol at room temperature. The commercial injection has a pH in the range of 3.5 to 5.5. Regarding potency, 1.08 mg buprenorphine HCl is equivalent to 1.0 mg buprenorphine freebase.
That means at 60-80degress fahrenheit or whatever your temp is where youre at you can dissolve what you want INSTANTLY without any heat, just with room temp water. Hell, if you want to be extra 'careful', crush the pill, pour in the spoon, add water (if I am using a 1mL syringe, I would add 90 units extra cold water AKA 0.9mL so you have room to register), and then while you are mixing honestly that small amount of water will warm back to room temp plus helping some insoluble cuts perhaps stay out. You basically spray the water onto the powder and mix with the back of the syringe (only do this once per syringe) and it will get cloudy right away, possibly with some powder settling at the bottom. Keep mixing, mixing, mixing! And then draw up with the most amount oif cotton you can get. Try to get 85-90units back into your syringe. It should look opaque or perhaps even clear in the barrel before you take it. Once it's in the barrel, put the tip into a fresh thing of water and draw up another 1-2 units so that the tip isn't still filled up with the not-so-clean(not micron filtered) solution before you decide to inject. BTW, Better to get a micron filter (google it or PM me) before you continue with that. but at the same time should be fine. Please be safe
edit: another thing that helps, but perhaps not recommended, at least not before youre washing your mouth out, is once the cotton is all "sucked out" from your rig, take the cover of the tip itself and put it between your teeth, and press between your teeth and push into the cotton really hard and then try to draw up again (at the same time its pressed down), so you will be really close to the cooker tbh). And then maybe even take the cotton with the plunger of your rig (while still attached to the barrel) and try to wipe the spoon down, and then press it into with the cover of the tip and just keep trying to do that again. IDK thats what I try to do. Once you've got that end-solution, optimally you should be filtering it through a 0.22um micron-filter before injecting.