Retsch SR 300 Impact Rotor Mill
The Retsch SR 300 Impact Rotor Mill is an efficient, high-performance grinding device that has been specially designed for processing and sample preparation of soft to medium-hard materials in research laboratories, industrial quality assurance laboratories and process monitoring. It can be used in both batch and inline processes and is preferred where the highest demands are placed on throughput, granulometric precision and process reliability. The SR 300 stands out from the competition thanks to its high rotor speed, excellent flexibility in terms of sieve sizes and its robust construction - features that are crucial for reliable and reproducible sample processing.
Precise material processing for the highest demands
The SR 300 enables fast and effective pre-crushing, deagglomeration and fine grinding of a wide variety of sample types - from agricultural raw materials to plastics and pharmaceutical products to building materials and environmental and recycling materials. Sophisticated technology and user-friendly design make operation simple and safe. The key data listed below illustrate the special performance and depth of application with which the mill far exceeds the standard:
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Maximum feed size: < 15 mm (depending on material)
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Final fineness: Up to < 50 µm achievable, depending on sample material and selected sieve size
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Rotational speed: 8,100 min-¹ (at 50 Hz), optionally up to 9,700 min-¹ at 60 Hz
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Rotor circumferential speed: 58 m/s (69.5 m/s at 60 Hz)
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Variable sieve sizes: Trapezoidal perforations from 0.08 to 2.00 mm, round perforations of 3.00, 4.00 and 10.00 mm
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Collection container: 5 litres standard, optionally 30 litres to increase sample throughput
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Protection class: IP 54 (protection against dust and splash water)
The grinding tools - grinding chamber, ring sieves and sieve frames - are made of high-quality stainless steel, offering maximum process reliability and durability, even with abrasive samples and regular operation. The interchangeable rotor types (standard and distance) support adaptation to specific grinding requirements, while the solid motorisation (2.2 kW three-phase motor, 3-phase connection, various voltage variants) guarantees constant power output.
With compact dimensions (5560 x 1200 x 890 mm* with base frame) and a net weight of around 95 kg, the SR 300 can be flexibly integrated into various laboratory or production environments with the optional base frame.
Strategic advantages & special features in operation
- High sample throughput thanks to high speed and variable sieve attachment
- Precise adaptation to material properties through various sieve and rotor types
- Batch and inline operation suitable for a wide range of process environments
- Excellent cleanability thanks to well-thought-out design
- IP 54 protection reliably protects the electrical system from environmental influences
- CE-compliant according to European safety standards
Typical applications in laboratories and industry
The technical design of the SR 300 gives specialist users the flexibility they need to process a wide variety of sample types reliably and reproducibly. The most common applications include:
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Grain analysis in agriculture: homogenisation of harvest samples, seed testing
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Quality control in the building materials industry: Fine grinding of cement clinker for standard-compliant sampling
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Plastics processing in the chemical industry: Deagglomeration and comminution for recycling tests and additive analyses
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Geological research: Sample preparation of rocks and ores for mineralogical analysis
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Spice and herb processing in food production: Grinding and homogenisation prior to sensory or chemical analysis
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Tablet and capsule testing in pharmaceutical laboratories: Precise grinding into powder for ingredient analysis
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Characterisation of environmental samples: Fine grinding of waste materials to determine analytical parameters
Substances such as different types of grain, plastics (PET, HDPE), active pharmaceutical ingredients, minerals, building material samples and organic and inorganic laboratory reference substances are processed as standard for these applications.
Certifications and compliance with standards
Thanks to its CE conformity and IP 54 protection class, the SR 300 complies with strict European standards regarding occupational safety, failure prevention and EMC directives. Its design offers reliable protection against dust and splash water - especially in laboratory and production environments with increased risk potential.
FAQs - Answers to the most important questions
Which materials does the mill process optimally?
- Suitable for soft to medium-hard materials such as grain, plastics, rock samples, herbs, tablets and various waste materials.
What are the minimum particle sizes that can be achieved?
- Depending on the material and the sieve size used, a final fineness of less than 50 µm can be easily achieved.
What options does the sieving system offer?
- Trapezoidal and round perforations are available from 0.08 mm to 10 mm. This allows precise adaptation to the sample target and application.
Is continuous inline operation possible?
- Yes, the design supports both batch and true inline use via conveyor systems.
What protection and safety features does the device offer?
- The entire design complies with protection class IP 54 and bears the CE mark for tested safety. The robust construction ensures user protection, especially in continuous operation.
Is the device easy to clean?
- Yes, thanks to the modular design, the grinding tools and interior are easily accessible and quick to clean.
Conclusion
The SR 300 stands for modern, powerful and flexible sample preparation in demanding analytical and industrial environments. Its robust construction, technical versatility and high operational reliability make it the first choice for laboratories and production sites where precision, efficiency and reliability are paramount.
