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73 micron bag

The first thing to consider when choosing a rosin screen size is the material you’ll be pressing. Kief and bubble hash press differently than flower, and their qualities change how rosin flows through the mesh of the bag. When you press flower testing at 20% THC, most of the material isn’t going to flow, whereas with a bubble hash measuring 70% THC, it’s all going to melt pretty easily. Since the material flows easier, we recommend a finer, 36-micron screen for bubble hash/kief if you’re looking for super-quality product. A finer screen helps keep dusty particulate in the bag too. A 72-micron bag is an acceptable choice for kief and bubble hash too.
“Mesh size” confuses things when we talk about rosin bag size. Mesh size is more like the thread count density of the sheets on your bed. Micron sizing refers to the size of the holes between the threads. Mesh size is how many gaps there are per linear inch. But measuring in microns cuts right to the chase and indicates how big those holes are— without having to think about them in terms of per inch . Make sure what you’re buying is expressed in microns rather than mesh size.
Not everyone is as quality-focused as Bud, so some prefer a 90-micron, 115-micron, or 120-micron bag for mass production. These sizes are all great for flower, depending on the product you’re creating. But in the rosin industry, screens looser than 120-micron are seldom seen. This is because trichrome heads themselves—the most cannabinoid-rich part of the plant—are 120 microns in diameter or a little smaller. Even though the trichromes melt, this is still an obvious choice for the upper size limit on rosin bags.
115-micron – Flower and trim rosin at excellent yield with good quality
“If I’m going for quality, I go with a 36-micron,” says Bud Smith, owner of Budsmith and winner of the Mecca Cup for best rosin. “Nothing over a 72. I’ve used a 25, and I felt like it was holding back a little too much of what I was trying to get out.”
Rosin press screen size beguiles newcomers, but it doesn’t have to. In this guide, we explain why screen size is important and how to select the rosin bag micron size that will work best for you. And, (bonus!) Budsmith, an award-winning rosin producer from Humboldt County, stops by to drop some knowledge too.
72-micron – Kief and bubble hash at excellent yield with good quality
90-micron – Flower and trim rosin at great yield with great quality
Most blowouts occur when the technician overfills the bag. For our 9-by-2.5-inch bags, an ounce of flower is a good guideline. Attempting to process any quicker than one ounce per bag risks breakage. Bud makes an additional caution to those pressing hash or kief: go slow.
Choosing a rosin press bag is simple… or is it? Rosin press screen size beguiles newcomers, but it doesn’t have to. In this guide, we explain why screen size is…