What are rosin press micron filter bags?

Rosin press micron filter bags are used to hold cannabis flower, trim or bubble hash for the purpose of extracting pure rosin from the raw material using pressure, heated plates.  The purpose of using a rosin bag is to extract an end product without particulates or impurities such as starting material (flower, trim, bubble hash), wax and lipids. Rosin filter bags are meant to be used with a variety of rosin press types (electric, commercial, hydraulic) and come in different sizes and micron grades.

Importance and purpose of using rosin press bags in cannabis rosin extraction 

The importance of using rosin bags stems from a concern for producing high-quality, pure rosin without contamination from particulate matter.  Some people believe rosin bags are optional and aren’t overly concerned about having some plant material in their end product. However, this school of thought typically comes from people who only press flower, because there’s no way that you could rosin press kief or bubble hash without rosin bags.

What materials are used to make rosin filter bags and which material is best for pressing rosin?

Rosin bags can be made from either nylon, polyester, silk or metal. The most popular choice for rosin bag material is nylon.  Nylon is considered the best material for rosin micron bags because it is more durable, heat resistant, flexible and has the ability to stretch, thus eliminating blowouts while under pressure. 

The second most popular choice of rosin bag material is polyester.  Polyester rosin micron bags are similar to nylon bags but without the flexibility, durability and extra cost associated with them. Polyester rosin bags are also cheaper compared to ones made from nylon, 

Another choice for rosin bag material is silk.  Silk rosin bags are not as flexible compared to nylon, way more expensive and can easily cause a blowout. More caution and a slower press are required in order to use silk rosin bags effectively and without breakage. 

The last type of rosin press bag material is metal. Metal rosin bags are the worst types of rosin bags to use as they can damage your heat plates.   However, metal rosin bags do serve a special purpose, which is to make THC diamonds. 

What are the benefits of using rosin press filter bags?

  • Increases yield of rosin extraction
  • Reduces contaminants in the end-product
  • Reduces waste and increases efficiency in rosin extraction
  • Increases the lifespan of  your rosin press plates 

Factors to consider when choosing micron, filter bags for rosin extraction:

The type of source material you’re using.  (i.e., flower, bubble hash or kief) – Depending on what you plan to squish will determine the type of rosin micron bag to use. For example, a metal mesh rosin bag is specifically used to make THC diamonds.  

The micron size of the rosin bag –  The appropriate micron-sized rosin bag for the source material you’re using. For example, you wouldn’t use a 30-micron bag for pressing fresh flower, as the holes in the bag are too small, adversely affecting your yield and quality. However, a 30-micron rosin bag is perfect for bubble hash as the holes in the bag are small enough so that bubble hash doesn’t go through the micron holes. 

The material the rosin bag is made from – As explained earlier in this article, the choice of rosin bag material plays an important part in a successful rosin extraction. Whether you are extracting rosin from flower, bubble hash or trim, you want to make an informed decision about your choice. Nylon is probably the most used and favored among rosin press hobbyists and commercial producers. 

Heat Tolerance – Different materials have varying tolerances to heat before they are damaged or compromised. Rosin extraction is not an exact science and people use a range of temperatures, some as low as 120 to 220 degrees. Depending on your rosin pressing style, you would want to pick a rosin bag made from a material that will handle the temperatures you prefer to use. For example, if you normally use 120 to 180 degrees for your temperature setting you could probably get by with polyester or silk rosin bags, but if you’re a novice and use a higher temperature, 180 to 220 degrees, than nylon rosin bags are probably better for you, since they are most heat resistive rosin bag material. 

Price and Value – Rosin bags aren’t expensive, but the price of continuously purchasing rosin bags can add up.  Many manufacturers outsource or produce similar products and distinguish their pricing from 

Food Grade and Dye-Free – With so many rosin filter bag manufacturers on the market, it’s important to know if your rosin bags are chemical and solvent-free.  Stick to reputable companies who are transparent about their manufacturing process and who do not use harsh chemicals and dyes that could potentially negatively affect your end product and even your health!

How to use, fold and pack rosin press bags?

The isn’t any wrong or right way of folding rosin bags, however, there are ways to fold rosin bags to get the most from your presses.  

Pillow Tech Method: This is the most conventional way to use a rosin filter bag. The material is packed into the bag (packed relatively firm, but not too loose) and placed horizontally on the heat plates for pressing. The one advantage of using this method is that it’s the easiest way to pack and press your material. No fussing around and very straightforward!

Bottle Tech Method: This is probably the second most popular way to press flower or trim. The bottle tech method uses a vertically orientated position before being placed between the heat platens for squishing. This is unlike the pillow tech method where the bag is placed on the heat plates in a horizontal position.  The bag is folded inward, towards the middle of the bag, and is placed in a vertical position, in a circular shape between the plates.  The method offers greater yield potential as there is less surface area compared to the pillow tech method. Less surface area means there is less room for your rosin to remain or get stuck in the corners of your bag. With a round-shaped bag, the rosin can flow a lot easier onto the collection plate or parchment paper, instead of having the rosin stuck in the corners and horizontal seams of your bag. 

Chottle Tech Method: The Chottle Tech method is very similar to the Bottle Tech method, with one main difference. Chottle Tech has no folds or material on top or bottom of the rosin press bag, exposing the bag directly to collecting material, be it parchment paper or what have you. There is no need to seal or fold off at the top and bottom. The biggest advantage of the Cottle Tech is similar to the reason that Bottle Tech is better than Pillow Tech, and that is less bag material from which rosin extraction can become trapped into, thus having lower yields. 

micron bag size chart for rosin 

rosin press micron filter bags for cannabis rosin extraction











Can I reuse rosin press filter bags?

You can reuse rosin press filter bags but most people do not.  If you’re a real penny pincher then you can reuse rosin bags by washing them in isopropyl alcohol, letting them completely dry and removing debris from them.  However, reusing rosin bags are frowned upon in the rosin press community because the bags lose their durability, flexibility and effectiveness.  Reusing rosin press bags will diminish your yield and may be more prone to blowouts. 

What size micron bag for flower rosin?

The ideal size of a micron rosin bag for pressing flower is 72 to 90.  This is the sweet spot for getting the best results from your rosin press bag, as the holes in the rosin bag are not too large or too small.  

What size micron bag for pressing kief?

The ideal micron rosin bag size for pressing kief is between 72 and 115. The difference in micron range will really depend on the moisture of your starting material.  If the kief or dry sift, is very dry and brittle you would need a smaller micron-sized rosin bag, since dry sift tends can easily go through larger-sized micron bags and contaminate your end product.  On the other hand, if your trim is fresh and pliable you would want to stick a rosin bag with a lower micron count. This will ensure you’re maximizing the yield potential of your press. 

What size micron bag for pressing bubble hash?

The ideal micron-size rosin bag for pressing bubble hash is between 15 and 30 microns.  The smaller micron size bag won’t allow the source material to seep through into your end product, which is what you want. The smaller micron size rosin bag won’t allow any contaminants, waxes or fats to pass through the rosin filter

What are some rosin press bag alternatives?

The following are some DIY rosin filer bag alternatives:

  • Coffee filter – Make sure the coffee filter is unbleached. Definitely prone to tearing and less effective than a rosin-micron filter bag
  • Tea bag – Same concept as a coffee bag and the same pros and cons
  • No bag – Probably the best choice as an alternative. There are many people who do not use rosin bags and are perfectly fine with it. However, this can only be done with flower material. If you’re pressing trim or bubble hash you would need a rosin bag.