RETSCH / ROTOR BEATER MILL

SR 300.
Flexible grinding. More ways to collect.

A floor-standing route for coarse and fine reduction of dry, soft to medium-hard organic and inorganic materials. Interchangeable components, speed adjustment and optional cyclone collection let you tailor the preparation workflow.

Discuss SR 300 Technical data

RETSCH SR 300 Rotor Beater Mill for grinding soft and medium-hard samples

Configurations and accessories shown may be optional.

FEED SIZE*< 25 mm

FINAL FINENESS*< 50 µm

SPEED3,000–10,000 rpm

THE MODEL IN FOCUS

Versatile dry grinding and deagglomeration with flexible collection.

Tune impact and shear

Adjust speed in 500 rpm steps and select the sieve for the material and desired output.

Manage frictional heat

An optional distance rotor reduces friction. Cyclone-assisted discharge can help cool the sample and grinding components.

Configure collection

Use the gravity outlet with a 5 L vessel or discuss a 30 L collector and optional cyclone arrangements.

Access the chamber

A removable hopper and push-fit grinding components simplify cleaning; the central lock and electric brake support controlled access.

*Published feed limits, fineness and throughput depend on the material, sieve, speed and configuration. Sieve aperture is not the final particle size, and maximum throughput and finest output are not simultaneous guarantees.

FUNCTIONAL PRINCIPLE

How SR 300
works.

Impact and shear act between the rotor, sieve and grinding inserts. Material small enough to pass the sieve leaves through the gravity outlet. A configured cyclone system assists discharge and separates airborne material.

Match sample behavior and feed dimensions
Choose the actual sieve, speed and contact materials
Validate the output with a representative trial

Representative RETSCH rotor mill with feeder and cyclone for grinding samples — Configuration example; confirm the accessories and arrangement.

PUBLISHED TECHNICAL DATA

The technical
picture.

SR 300: rotor beater mill for soft, medium-hard samples.

Published feed limits, fineness and throughput depend on the material, sieve, speed and configuration. Sieve aperture is not the final particle size, and maximum throughput and finest output are not simultaneous guarantees. Confirm current electrical and installation requirements before ordering.

Maximum feed size*: < 25 mm
Final fineness*: < 50 µm
Speed at 50 Hz (60 Hz): 3,000 - 10,000 min-1 (in steps of 500 min-1)
Collector capacity: 5 l / optional: 30 l
Power consumption: 2.5 kW
W x H x D closed: 600 x 1200 x 700 mm (with base frame)
Net weight: ~ 60 kg (with base frame)

All other specifications

Applications: size reduction, deagglomeration
Field of application: agriculture, chemistry / plastics, construction materials, environment / recycling, food, geology / metallurgy, medicine / pharmaceuticals
Feed material: soft, medium-hard
Rotor peripheral speed: 22 ..72 m/s
Types of rotors: standard / distance
Material of grinding tools: rotor and sieves of stainless steel
Sieve sizes: trapezoid holes 0.08 / 0.12 / 0.20 / 0.25 / 0.35 / 0.50 / 0.75 / 1.00 / 1.25 / 1.50 / 2.00 mm round holes 3.00 / 4.00 / 10.00 mm
Hinged hopper: removeable hopper
Dust extraction unit: optional cyclone
Drive: 3-phase motor
Electrical supply data: 200-240 V, 50/60 Hz
Power connection: 1-phase
Engine brake: yes, electric
Protection code: IP 41
Standards: CE

CONFIGURE THE WORKFLOW

The options shape
the result.

Standard or distance rotor

Choose the standard rotor for general preparation or review the distance rotor where frictional heat is important. Optional 180° inserts add impact for suitable hard-brittle applications; confirm suitability by testing.

Sieves & contact materials

Stainless steel rotors and sieves are listed. Sieve apertures span 0.08–10 mm across the offered shapes. Review wear contribution and cleaning against analytical requirements.

Feeding, cyclone & cold methods

Discuss DR 100 feeding, cyclone collection and collector sizes. Cold or cryogenic preparation requires a compatible procedure and complete configuration; do not assume every setup is suitable.

TYPICAL MATERIALS

Start with your sample.

Examples guide the discussion; they do not guarantee a result for every material or formulation.

Feed pellets
Grains & seeds
Plant materials
Resins & plastics
Soils
Chemical powders

Explore materials & applications

MODEL APPLICATION REVIEW

Put SR 300
to the material test.

Share the starting size, desired fineness and quantity to process. We’ll review the milling route, tools, collection and opportunities for a material trial.