Microns
70u vs 90u Hash (and 40u): What Do Micron Ranges Mean?
If you’ve seen hash labeled 40u, 70u, or 90u, that refers to the micron size of the screen used to collect trichomes during washing.
In simple terms: Microns = the size of the trichome heads being separated.
90u Hash (Most Popular)
90 micron is often considered the sweet spot.
Strong aroma
Clean melt
Consistent performance
If you’re unsure what to choose, 90u is usually the safest option.
70u Hash (More Selective)
70 micron collects slightly smaller heads.
Can be very clean and refined
More strain-dependent
Sometimes lighter or more nuanced smell
Can be darker/drier
40u Hash (Lower Grade / Food Grade)
40 micron catches the smallest material.
Often includes more contaminants (plant matter, broken heads)
Typically less melt and less flavor
Commonly used for edibles or lower-tier products
Is Lower Micron Better?
No. Micron range isn’t a quality score—it’s just a filter size.
Genetics and process matter more than the number.
Bottom Line
90u = reliable, balanced, flavorful
70u = more niche, sometimes more refined
40u = usually lower grade / food grade
Micron ranges tell you how hash was separated—not how good it is.