Pre-sterilized Cellulose Nitrate Membrane Disc Filters are specially designed for critical filtration applications where sterility, accuracy, and contamination control are essential. These filters come ready-to-use (EO sterile), eliminating the need for additional sterilization and saving valuable time in laboratory and industrial processes.
Widely used in global markets such as the USA, UK, Germany, and Australia, these filters are trusted for their consistent performance, high flow rates, and compliance with international standards.
What is a Pre-sterilized Cellulose Nitrate Membrane Disc Filter?
A Pre-sterilized Cellulose Nitrate Membrane Disc Filter is a hydrophilic membrane filter made from cellulose nitrate and sterilized using ethylene oxide (EO). It is designed to remove bacteria, particles, and contaminants from aqueous solutions while maintaining sample integrity.
Because it is pre-sterilized, it can be used directly in sensitive applications without any additional preparation, making it highly convenient and reliable.
Where Are These Filters Used?
These filters are widely used in industries where sterility and precision are critical:
-
Sterility Testing: Ensures contamination-free pharmaceutical and lab processes
-
Aqueous Solution Filtration: Ideal for water-based liquids
-
Product & Water Microbiology: Used for detecting and analyzing microorganisms
-
Laboratories: Suitable for routine and advanced filtration tasks
They are essential in maintaining clean, safe, and accurate testing environments.
Why Are Pre-sterilized Filters Used?
Pre-sterilized membrane filters are used to simplify workflows and reduce contamination risks.
Key reasons include:
- Ready-to-use sterile format (EO sterile)
- Eliminates need for in-house sterilization
- Reduces handling errors and contamination
- Ensures consistent and reliable results
- Saves time in critical laboratory processes
They are especially useful in environments where sterility cannot be compromised.
Material and Construction
These filters are made from Cellulose Nitrate membrane, known for:
- Hydrophilic nature for easy filtration of aqueous solutions
- Strong microbial retention
- Uniform pore structure for accurate results
- Biologically inert composition
Available Specifications:
-
Pore Sizes: 0.2µm, 0.45µm, 0.8µm
-
Diameter: 47mm
Working Principle
These filters operate on a mechanical filtration mechanism, where the membrane traps particles and microorganisms based on pore size.
-
0.2µm filters: Used for sterilization and removal of bacteria
-
0.45µm filters: Used for general microbiological analysis
-
0.8µm filters: Used for coarse filtration
This ensures precise and effective filtration in all applications.
Key Features
- Pre-sterilized (EO sterile) for immediate use
- Hydrophilic membrane for aqueous solutions
- Non-media migrating structure
- High flow rates for faster filtration
- Biologically inert material
- Consistent and reliable performance
- Suitable for microbiology and sterility testing
Benefits of Using Pre-sterilized Cellulose Nitrate Membrane Disc Filters
- Ready-to-use format saves time
- Reduces contamination risks
- Ensures high purity and accuracy
- Ideal for critical laboratory applications
- No need for additional sterilization steps
- Consistent results in every use
Technical Specifications
| Category |
Parameter |
Details |
| Construction |
Membrane |
Cellulose Nitrate |
|
Pore Size |
0.2µm, 0.45µm, 0.8µm |
|
Diameter |
47mm |
| Operational |
Max Operating Temperature |
80°C continuous |
|
Max Operating Pressure |
5 Kg/cm² |
|
Sterilization |
Autoclavable at 121°C for 30 minutes |
| Bubble Point |
0.2 µm |
> 50 psi (3.52 Kg/cm²) with water |
|
0.45 µm |
> 32 psi (2.25 Kg/cm²) with water |
| Retention Efficiency |
0.45 µm |
LRV > 7 for S. marcescens
|
|
0.2 µm |
LRV > 7 for B. diminuta (ASTM F838-05) |
| Water Flow Rate |
0.2 µm |
20 ml/min/cm² @ 10 psi @ 27°C |
|
0.45 µm |
45 ml/min/cm² @ 10 psi @ 27°C |
Ordering Information
| Category |
Option |
Code |
| Type |
Presterilized CN Disc Filter (CNXX) |
— |
| Size |
47mm |
09 |
| Pore Size |
0.2µm |
01 |
|
0.45µm |
02 |
|
0.8µm |
03 |
| Sterility |
EO Sterile |
2 |
| Pack Size |
100 |
04 |
