In addition to the conventional needle filter, Chengdu Moore Scientific Instrument Co., Ltd. can also customize the needle filter according to the customer's requirements:

 

Such as: the following special specifications of needle filter. Few manufacturers will have this special type of needle filter. But we do, so. , if you need to call 028-85115092 or search Chengdu Moore Scientific Instrument Co., Ltd

 

4mm needle filter 13mm needle filter 17mm needle filter 25mm needle filter 30mm needle filter 33mm needle filter 50mm needle filter

 

Introduction of disposable needle filter

 

1. The shell of needle filter is made of polycarbonate, polypropylene and polyethylene plastic. The upper and lower parts are welded together by ultrasonic wave, which is resistant to high pressure, and there is no product leakage.

 

2. The needle filter is widely used in the laboratory. It does not need to change the membrane and clean the filter, and saves the complex and time-consuming preparation work. It is mainly used in the sample pre filtration, clarification and particle removal, liquid and gas sterilization and filtration. It is the first choice to filter HPLC and GC small sample.

 

2 classification of disposable needle filter

 

1. Classification of liquid properties: water phase filtration; organic phase filtration.

 

2. Filtration phase classification: gas phase filtration; liquid phase filtration.

 

3. Filtration purpose or process classification: sterilization filtration; clarification filtration; pre filtration; particle removal filtration;

 

4. Interface type: female bayonet; formula bayonet

 

5. Overall dimension: 4mm13mm17mm25mm33mx50mm, etc

 

6. structure of filter layer: monolayer structure; multilayer structure; capillary structure

 

7. Hydrophobic polytetrafluoroethylene membrane (PTFE): used for filtration of air, gas and hydrophobic chemicals;

 

3. Characteristics of common filter materials for disposable needle filter

 

1. Polytetrafluoroethylene membrane is made of natural permanent hydrophobic PTFE material, which can ensure the passage of moist air or other gases without obstruction even under a very low pressure difference, while the water solution cannot pass through. Its performance is opposite to that of hydrophilic membrane. PTFE membrane has a strong chemical compatibility, and it is almost competent for the filtration of all organic solvents and strongly corrosive chemicals. When it is necessary to filter the aqueous solution with PTFE filter membrane, it must be pre soaked with ethanol or isopropanol before the aqueous solution can be filtered.

 

2. Glass fiber pre filtration membrane (GF): it is used to improve the filtration passing rate and continuous filtration; the glass fiber filter membrane belongs to deep filtration, and its main purpose is to be used as the pre filtration layer and directly added to the filtration membrane.

 

3. Nylon membrane (nylon): it is used for filtration of alkaline solution and organic solvent; nylon membrane has very good mechanical strength, strong adsorption, and can withstand most organic solvents and most alkaline solutions, especially suitable for filtration of alkaline solution. For organic solvent filtration, such as HPLC mobile phase particle removal filtration, nylon membrane is more economical and practical than PTFE membrane, in addition, nylon membrane can also be used as transfer membrane. Due to the relatively high adsorption performance of nylon membrane, it is generally not recommended to filter biological samples such as culture medium or protein solution, so as to avoid loss of samples due to adsorption. In this case, cellulose acetate membrane (CA) with low adsorption is more suitable.

 

4. Due to the difference of molecular chains in spatial arrangement, tpf-pp can be classified into two types: random PP and random PP. At room temperature, it can withstand most chemical solvents except strong oxidants; it is applied to impurities or particles in liquid or gas. It is not used for sterilization and filtration, but only for clarification and filtration.

 

5. PVDF membrane has excellent heat resistance and chemical stability. It is not corroded by acid, alkali, strong oxidant and halogen at room temperature, and is stable to aliphatic hydrocarbon, aromatic hydrocarbon, alcohol, aldehyde and other organic solvents. Hydrophilic PVDF is widely used in biopharmaceutical sterilization and filtration because of its low protein adsorption and few precipitates. PVDF with positive charge can be used to remove endotoxin.

 

4 Application of disposable needle filter

 

1. HPLC sample preparation

 

2. Routine QC analysis

 

3. Remove protein deposits

 

4. Dissolution determination 5. Food analysis

 

6. Biofuel analysis

 

7. Environmental testing

 

Chengdu Moore Scientific Instrument Co., Ltd. provides various specifications and models of nylon needle filter (water system / organic system), polytetrafluoroethylene (PTFE) needle filter, polyvinylidene fluoride (PVDF) needle filter, sterilization needle filter, Bepure pressure needle filter, PES needle filter, GF needle filter, CA needle filter, etc. , if you need, please call (028-85115092)