Rosin Press (extractor) from OGcrush


Rosin technology is an innovative emerging technique that, unlike other resin extracting technologies, produces solvent-free cannabis concentrate, not compromising on quality.

Organic, solvent-free cannabis oil is rich in terpenes and flavor.


You need only three components to produce rosin (extract concentrate from your flowers or hash) using an OGcrush rosin press (rosin extractor): heat, pressure and time. No need for solvents or heavy equipment. The rosin press machine has evolved dynamically lately, allowing users to balance the above-mentioned components to create a superior quality product.


Rosin press technology can produce controlled levels of heat and pressure to extract rosin of exceptional quality. Too much heat in the extraction process would degrade terpenes and cannabinoids in your final product. To be able to reduce heat, higher pressure must be applied. To make a long story short: an effective rosin press combines the right amount of pressure with the lowest possible heat level to minimize degradation and keep the original terpene profile of your product.


Before you start


To make rosin, you have several options in terms of starting materials. You can choose from flowers, kief or hash. If you press flowers, you will get excellent quality but not necessarily the best yields. Kief or hash will produce great quality and decent yields.


On top of your starting materials, you will need:


Micron filter bags

Pre-press mold

Parchment paper

Collection tool

Rosin press

Glass jar


TIP: It is good to experiment and test a bit before you start pressing as every strain is different and reacts to heat and temperature differently.


Recommended testing temperatures:


Bubble Hash: 75 °C

Dry Sift/Kief: 80 °C

Flower: 85-100 °C

Trim/Leaves/Shake: 105 °C


The right temperature makes the good final product. Remember that!


Lower temperatures equal more flavor/terpenes, less yield, stable material
Higher temperatures mean less flavor/terpenes, more yield, less stable material


Pre-pressing (recommended by OGcrush for better results)


Fill the pre-press mold with the plant material of your choice (recommended 5-7 grams round pre-press rectangular 10-20 grams) and press it for at least 20 seconds so you end up with a solid round or rectangular puck which you will then place into a Rosin bag of your choice.



Place your plant material in between the parchment paper and start to press. After that, remove the filter bag or flower from the paper, and your rosin will be yielded onto your parchment paper.



This is what you can expect in terms of yield per starting material, together with the recommended filter bag, temperature and length of the press:  


Average yields                    Recommended Filter Bag              Pressing


Flower: 10-30%                       37/90/120/160um                         100 °C 90 seconds 1x press
Dry sift: 20-60%                      25/37um                                          80 °C 55 seconds 3x press
Bubble: 20-70%                      25/37um                                          80 °C 55 seconds 3x press


You can decide to use the leftover material for example for cooking, or just throw it away because a major part of the beneficial cannabinoids has been extracted.


 Quality rules


The average starting material makes average results. It means if you want rosin of great taste, quality, fine texture, and translucent color, you need to use outstanding quality flowers. The quality of your concentrate will highly depend on the “gardener’s know-how” as well as on the freshness of the flowers. The best way is to extract flowers as soon as possible after they are dried and cured. Go fresh and you will know the difference.

Humidity is king


Another important factor influencing your rosin yields is the humidity and moisture content of your flowers. You’d better check that the relative humidity content of your buds is at least 55% to 62% for optimal results.

How to measure humidity


You can check the moisture content of your flower quickly by using either an analog hygrometer or a digital hygrometer. You can increase the humidity levels of your starting materials pre-set humidity packs that help you get your flowers to the ideal moisture level.

Genetics matters


Don’t be afraid to experiment to discover the best yielders, bearing in mind that some cannabis strains are known to do better than others (for example indicas and hybrids usually generate better results than sativas). Generally said, the yield, flavor, and quality are determined by the genetics of your plants as well as on the way they were grown and treated.

Top  strains for pressing:

Strawberry Banana – DNA Genetics


GMO (a/k/a Garlic Cookies) Mamiko Seeds

Hat Trick Oni Seed Co.

GG4 (a/k/a Gorilla Glue #4)

Cold or hot pressing?


The right combination of pressure, temperature and time is the real “magic” of the rosin press technology. Solvent-free extract lovers swear on two temperature ranges, depending on your desired result.

Cold Pressing: 


70 °C – 90 °C, pressed for one and five minutes or longer. Result: batter consistency, rich terpene preservation, but sometimes lower yield.


Hot Pressing:


90 °C – 105 °C, pressed for between 45 seconds and 3 minutes. Result: oily or shatter-like consistency, high terpene preservation, and often higher yield than in case of cold pressing.

The speed and consistency in which the trichomes liquefy depend greatly on what temperature is being applied, as well as the evenness of the heat distribution. Some experts believe that you can reach the best compromise between final product quality and yield if you apply a 100 °C – 105 °C range. But it all depends on your goal:  if you go for terpenes and quality, start colder and test. It is up to you to find out what works best for you.


The higher the better?


It would be unwise to expect that the higher the tonnage of your press, the better result you achieve. Just remember that flower rosin needs higher pressure than kief and has rosin to extract the oil out.


Some rosin presses provide 20 or even 30 tons of pressure but too much force may mean undesirable particles in your extract. Experience shows that the ideal pressure for flower extraction ranges between 550 and 1,500 PSI at the plate. Once again – don’t be afraid to experiment and don’t forget how much starting material quality and humidity matters. The right level of pressure is a subject of fierce discussions, and if you have better results with higher force applied, stick to it. Or try lower levels and see what you get compared to the original way.




After you finish pressing, we recommend you to cool it down (for example by putting it in the fridge). Then use your dab - collection tool to collect the rosin from the paper. 




Short term – you can use silicone jars which should be stored in a cool and dark place.


Medium-term – to preserve all the aspects of your extract you should use glass jars which can be stored in a fridge and the same applies as above.


Long term – to choose the right container is the key to have your extract tasty after months of preservation. For this purpose simply use a UV filter coated glass jar.


You can find all that is needed for professional extraction on, please simply drop us a note and we will respond promptly.


Thanks to our friends for the useful info!