Micron size plays an important role throughout solventless extraction, from bubble bags during washing to rosin bags during pressing. Logic may tell you that the smaller the micron, the higher the quality.
But anyone who has worked with bubble bags knows that is not always how it plays out. There is a point of diminishing returns. As you move below 45µ, you are not automatically increasing quality. You are narrowing the size range of what you collect, and those lower fractions often contain smaller immature heads, broken heads, and stalk material.
We want to know if the same principle applies to rosin bags. 25 micron is the industry standard for pressing bubble hash, but we have heard many hashmakers in recent months sharing their results with 5 micron rosin bags. So we set up this experiment to determine: Does moving from a standard 25µ rosin bag to a much tighter 5µ meaningfully improve quality, and if so, at what cost? Where is that point of diminishing return?
Experiment Goals
Goal 1: Determine whether 5µ rosin bags provide measurable improvements in refinement or terpene concentration compared to 25µ.
Goal 2: Quantify the impact of 5µ filtration on yield.
Defining success: If 5µ provides meaningful measurable improvements without drastically impacting yield, it could justify broader use. If improvements are marginal while yield loss was significant, it would suggest 5µ is better suited for niche applications.
Equipment Used in the Experiment
Pressing
Rosin Bags
- 25µ double wrapped
- 5µ double wrapped
Starting Material and Test Parameters
Strain: Citrus Octane
Material Type: Bubble hash
Micron Range: 45µ to 159µ
Load Weight: 32.75 grams per bag
All presses were performed using the same batch of bubble hash to ensure consistency between micron groups.
Press Parameters
Temperature: 173°F
Preheat Time: 30 seconds
Press Time: 3 minutes after preheat
Maximum Pressure: Stopped at 4,000 PSI on every press
The only variable changed in this experiment was micron size.
The 25u and 5u Rosin Bag Test Results
For laboratory analysis, 2 grams of rosin from the first press of each micron group were collected and submitted to Tryptomics for third party testing.
We’re including the full Certificates of Analysis below so you can review the raw data yourself. For those who just want the high-level comparison, we’ve also summarized the key results in a simple table.
Here is a summary of the results:
| Metric | 25µ | 5µ | Difference |
| Average Output (g) | 21.305g | 17.74g | −3.565g |
| Yield % | 65.06% | 54.18% | −10.88% |
| Total Cannabinoids % | 79.901% | 81.14% | +1.24% |
| Total THC % | 67.272% | 68.380% | +1.108% |
| Total Terpenes % | 7.127% | 7.329% | +0.202% |
Conclusion on 5 Micron Rosin Bags
1. Did 5µ meaningfully improve measurable quality?
The simple answer is yes, the 5µ rosin bag did improve overall quality with a 1.24% increase in cannabinoids, a 1.1% increase in total THC and a .2% increase in terpenes.
2. What was the cost?
Switching from 25µ to 5µ resulted in an average yield reduction of 10.88 percentage points, or roughly 3.56 grams less rosin per 32.75 gram press. That difference is substantial.
Final Thoughts
This experiment ended with quite a few trade offs. The 5µ bags did produce slightly higher cannabinoid and terpene concentrations, but those gains came at the expense of a significant reduction in yield.
Solventless is already the Audi of cannabis. It is a premium, higher cost product. It is the high performance model built for daily driving. Rosin pressed with 5µ bags, on the other hand, is the RS of Audis. It is the 0.1% of the 1%, where you are sacrificing practicality, cost efficiency, and everyday usability in pursuit of peak performance. Both are excellent. They just serve different purposes.
For small batch or competition level hashmakers, the tradeoff may make sense. When you are chasing incremental refinement and volume is secondary, even fractional gains make a difference. For medium to large scale solventless operations, however, an approximately 11 percent yield reduction compounds quickly.
The question now is whether the incremental gain justifies the loss in efficiency for your specific application. As with all of our testing, our goal is not to push a narrative, but to define the variables so you can make that decision yourself. Our experiment was done with a small sample size and we welcome everyone in the industry to share their own results and experiences.