Stomacher® 3500

Category Paddle Blender
Manufacturer Seward
Country of manufacture the United Kingdom

The Stomacher® 3500 Series provides a versatile range of tools for large volume blending and extraction where all washing solution or solvent needs to be retained for analysis. This heavy duty range of machines are built to industrial standards and often used in applications for large volume food microbiology, forensic residue analysis and testing of waterborne parasites.

Why the Stomacher® 3500 Series

  • 400-3500ml sample capacity
  • Suitable for wide range of food applications
  • Cryptosporidium and Giardia testing
  • Trichinella testing
  • 3 year warranty and 10 year service support

The Stomacher 3500 is used where large volume blending is required. The blending of powders with diluents and the microbiological testing of complete recipe dishes are two popular applications.

The Stomacher 3500 Biowasher was originally designed to process the large volume of filter fibres derived from cartridge filters used in testing water for parasites. The Stomacher® method is highly referenced for this technique. The Biowasher is the Stomacher of choice for the processing of large, fibrous samples.

Key Attributes
Homogenizer Type Paddle Blender
Sample Throughput 1 sample
Sample Volume (min) 400 ml
Sample Volume (max) 3.5 l
Usage / Placement Benchtop
Cooling No
Warranty 3 years
Noise Level
Weight 93 lb
Width 22.4"
Depth 22.6"
Height 22.0"


Manufacturer Specifications
Dimensions 480mm wide x 480mm deep x 445mm high (unpacked)
Weight 36kg (unpacked)
Supply Voltage 100-120V
Supply Frequency 50-60Hz
Mains Inlet Fuses* T2.0A 250V 5x20mm, breaking capacity: 100A @ 250V
Transformer Fuse* T250mA 250V 5x20mm, breaking capacity: 35A @ 250V
PCB Fuse* F2.5A 250V 5x20mm, breaking capacity: 100A @ 250V
Insulation Class 1 (Earthed)
Installation Over Voltage Category II
Pollution Pollution Degree 2
Duty Cycle Continuous
Rated Load 120W
Disposable Bag Size 380mm x 508mm
Minimum Recommended
Maximum Recommended
Maximum Recommended
Sample Temperature
Recommended Operating
Ambient Temperature Range
Recommended Operating
Relative Humidity Range
Fixed Timer Settings

30 seconds (±5%) 
60 seconds (±5%) 
120 seconds (±5%) 

No Load Paddle Speeds
(@ nominal 20°C)
125rpm (±5%) LOW 
150rpm (±5%) NORM. 
175rpm (±5%) HIGH
Paddle Clearance 0-20mm
Note * Only these or equivalent UL-approved fuses should be used

What is the temperature range for the Stomacher 3500 Bioreactor Thermo?

Room temperature to 50°C.


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Stomacher® 3500 Accessories