There are many variables to making cartridges so all information is welcome. This is what I have learned starting with the less desirable in the beginning.
Non canna cutting agents- Let’s just agree NO!
Non canna terps are best to be used starting at a 4.5% ratio of terps to start with. This may be enough for some flavors. But let’s be honest nobody wants that stuff anymore. It sucks.
Now for the goods.
Cartridges. Stainless and glass or quartz tube with vertical ceramic are best. Top airflow leak less, but bottom airflow are fast catching up. Currently I would recommend Itsuwa V16 or V12, Ygreen SC1 or SC1+
When it comes to makeup and flavor there are many options. Most customers tend to want a “full spectrum” high. Pure thca tends to mostly give just a head high and will burn quick. The mixtures that work the best tend to have the best response have thca distillate, HTE, and purged extract. Some people prefer purged extract only. Purged extract has a lot of flavor and will burn slower. It will ass a body high too. HTE makes the flavor better. A few mixtures I prefer are
20% HTE 60% distillate 20% purged extract
20% HTE 80% distillate
10% HTE 50% distillate 40% purged extract
Above mixtures are the three separate ratios that have been adopted by various companies. As these % were of my own intellect and as I signed no NDA and was never paid more than the sample of the product I hereby provide my intellectual property as free and open source materials.