Rosin is a form of solventless concentrate, which is derived by pressing the cannabis flower and using a combination of heat, time and pressure to extract a substance that is rich in terpenes and has a similar consistency to sap. Rosin is sometimes referred to as ‘solventless shatter’, and its main draw is that the extraction process doesn’t require solvents.

A rosin press is a piece of equipment used to extract rosin. In days gone by, DIY approaches were commonplace, but as the demand for rosin and its reputation have grown, more sophisticated gadgets have become available .
The aim of a rosin press is to extract this sap-like substance (rosin) from your starting material with ease and speed. The end product is similar to other cannabis products like BHO (butane hash oil), but you don’t need a solvent, and this is why rosin has got people talking. 
There are several different types of cannnabis press on the market, and the range of products is expanding all the time in line with demand for rosin. The basic requirement is to utilize heat, pressure and time, but there are variations in techniques and processes. Examples of types of rosin press include:
DIY rosin press 
Manual press
Pneumatic press
Hydraulic press
Electric press
Hybrid press
What is a rosin press used for?
A rosin press is a device used to extract a solventless concentrate from cannabis flowers, kief or trim. The aim is to take the starting material, put it through the pressing process and emerge with a substance that is terpene-rich, potent and pure.
Using a rosin press enables you to extract a concentrate without the need for a solvent, and it also simplifies and speeds up the extraction process .
The benefits of using a rosin press:
Efficiency
Whether you’re pressing for personal use, or you’re looking into using a rosin press for a larger operation, rosin presses offer substantial efficiency gains.
Using a press streamlines the process of extracting the desired concentrate from the starting material, reducing time, energy and effort. The more sophisticated the press, the quicker it will produce the yield you’re searching for. 
Safety
Rosin presses have come a long way since the days of DIY gadgets and borrowing hair straighteners. Using a specialist rosin press is a safer and more effective option. It’s also important to note the difference between solvent and solventless pressing.
As rosin pressing eliminates the need for a solvent, operators can take advantage of a much safer procedure. As the process is simple and safe, it’s also more accessible . More people are able to try rosin pressing than other forms of extraction, for example. 
Versatility
A rosin press is a versatile investment, which affords the user the opportunity to create an array of different products. Most people think of rosin as a translucent, sap-like substance, but it can also become harder and more glass-like.
Variations in heat, pressure and time can affect the density and shape, as well as the flavor and color. 
Cost
A rosin press represents excellent value for money when comparing solventless pressing to solvent presses. With solvent-based extraction, you have to invest in specialist equipment, which can cost a fortune compared to a rosin press. 
How does a rosin press work?
A rosin press is essentially any kind of tool or gadget that uses a combination of time, pressure and heat to extract cannabinoids. In the vast majority of cases, a rosin press comprises two heated plates, which heat and apply pressure to the starting material.
To achieve the best results, it’s important to consider the impact of heat, time and pressure in terms of the quality of the end product and the yield . In this section, we’ll discuss how a rosin press works in more detail, examining optimum temperatures, time periods and pressure.