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The commonly used rubber mixing machines (also known as rubber mixing machines) in laboratories often come in various sizes and specifications to meet different laboratory and production needs. Generally speaking, the common sizes of rubber mixing machines in laboratories mainly include the following:

1. Small rubber mixing machine: Small rubber mixing machines are suitable for small-scale laboratories or laboratories, usually with small working capacity and size, suitable for small batch experimental preparation.

2. Medium size rubber mixer: Medium size rubber mixer usually has a larger working capacity and size, suitable for medium-sized laboratories or production environments, and can handle large batches of samples.

3. Large scale rubber refining machine: Large scale rubber refining machines are usually used in industrial production, with larger working capacity and high efficiency, suitable for processing large quantities of raw materials, and usually equipped with automated control systems.

Choose the appropriate size and specifications of the rubber mixing machine based on the specific needs and experimental scale of your own laboratory. When selecting a rubber mixer, it is necessary to consider factors such as sample size, work efficiency, and accuracy requirements to ensure that the mixer can meet the needs of the laboratory and provide accurate and reliable experimental results.