What Do Micron Ranges and Wash Grades Mean?

Concentrate listings sometimes include labels such as “70–120u,” “first wash,” or “third–fourth wash.” These terms describe parts of a producer’s process or product classification, but they are not universal quality scores. Here is how to read them without relying on the number alone.

What does “micron” mean?

A micron (µm) is a unit of length equal to one millionth of a meter. In hash production, micron ranges commonly refer to screen or filter-size bands used during separation or to how a producer classifies collected material. For example, a listing that says “70–120u” identifies a range, but the precise way that range is used depends on the producer and process.

What does a wash number mean?

For ice-water hash, producers may collect material across successive washes and identify releases as first wash, second wash, or later washes. These labels describe where the material came from in that producer’s process. The number alone does not tell you every detail about starting material, collection practices, curing, or final texture.

Can micron range or wash grade tell you which product is best?

Not by itself. Producers may use different starting material, equipment, collection methods, and classification standards. A stated micron range or wash number should be read alongside the maker, cultivar, starting material, format, and other product-specific details. Do not treat these labels as a universal ranking or assume that one number guarantees a particular flavor, potency, or experience.

What should you check on a listing?

• Producer and batch: Confirm who made the product and which release is being described.
• Starting material: Look for whether the listing identifies fresh-frozen or dried/cured material.
• Format: A jar of hash, live rosin, fresh press, jam, or a thumbprint may be processed or presented differently.
• Size and details: Confirm the weight, selected cultivar, and current availability for the exact variant.
• Testing information: Review any batch-specific COA provided with the product.

Explore concentrate listings at Daily Hi

Browse Hash and Live Rosin at Daily Hi. To learn the difference between the two categories, read Hash vs. Live Rosin. For help interpreting a lab report, see our THCa concentrate COA guide. Listing details vary by producer and batch, so use the specific product information when comparing releases.

For related reading, see Hash vs. Live Rosin, solventless concentrate formats, and our THCa concentrate COA guide.