ASTM F1671 dry microbial tester
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The Dry Microbial Penetration Resistance Tester assesses material resistance to dry bacteria-carrying particles (like human dandruff-sized). It tests protective gear (surgical gowns, etc.) per ISO 22612. part of EN 13795 and EN 14126 test suites. Compliance with EN 13795 aligns with EU Medical Device Directive 93/42/EEC, crucial for CE marking in Europe.
Standards:
ISO 22612:Clothing for protection against infectious agents - Test method for resistance to dry microbial penetration
YY / T 0506.5-2009:Surgical drapes, gowns and clean air suits for patients, clinical staff and equipment - Part 5: Test method for resistance to dry microbial penetration
Features:
Reliable design, stable test;
Front switch glass doors, easy to observe the operation of the experimental staff;
Removable bracket, height adjustable bracket;
Support, mobile dual casters;
Negative pressure experimental system, with the fan exhaust system and the introduction of high efficiency filter to ensure the safety of operators;
Embedded high - speed industrial microcomputer control;
Dedicated operating software, with software parameters calibration, fault detection automatically
Test principle:
When testing, the samples were seperately fixed on a container.In these containers, five containers carrying the bacillus subtilis and 1 container carrying uncontaminated talc powder used as control.Insert 1 petri dish at the bottom of each container and beneathe the bottom of the specimen.
The supporting vessel's equipment is oscillated by a gas ball type oscillator, and all of the talcum powder passing through the sample falls onto the petri dish. Remove the petri dish for culture. The experiment results were evaluated by counting the colonies.
Main parameters:
| Parameter Name | Parameter Value |
|---|---|
| Vibration form | pneumatic ball vibrator |
| Vibration frequency | 20800 times/min |
| Vibration force | 650N |
| Worktable size | 40cm × 40cm × 10mm |
| Workbench media | marble plate |
| Experimental container | stainless steel test container |
| Work stations | 6 |
| Cabinet negative pressure range | -50 Pa ~ -200 Pa |
| High efficiency filter filtration efficiency | better than 99.99% |
| Negative pressure cabinet ventilation flow | ≥ 5m³/min |
| Data storage capacity | 100.000 group |
| Working voltage | 220V 50HZ |
Accessoriess：
The accessories and specifications for the dry microbial permeability resistance tester are as follows:
Pneumatic Ball Oscillator:Generates high-frequency vibrations of 20.800 times per minute to simulate microbial activity on material surfaces, ensuring test accuracy and stability.
Stainless Steel Test Container:Typically equipped with 6 sets, featuring a metal piston on top to secure the specimen and maintain its slack within a controllable range.
Petite Dishes:Placed at the bottom of the test container to collect talc powder penetrating the specimen. Colony counting is performed through isothermal incubation to evaluate the material's microbial barrier properties.
Marble Workbench:Measuring 400mm × 400mm × 10mm, providing a stable testing platform to ensure accuracy and repeatability during testing.
Fixing Plate and Rubber Supports:The fixing plate secures the test container, while the rubber supports adjust the level, stabilize the instrument's position, and prevent movement.
Compressed Air Flow Meter:Measures the airflow generating 20.800 vibrations per minute, ensuring stable test conditions.
Color Touchscreen User Interface:Used for preset parameters and displaying test results, improving ease of operation and intuitiveness.
Protective system components: including a negative pressure testing system and inlet/outlet HEPA filters, ensuring operator safety while preventing microbial leakage during testing.
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