Classification and application of the hottest disp

2022-08-11
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Classification and application of disposable needle filter

the shell of disposable needle filter is mostly made of polycarbonate, polypropylene and polyethylene plastic, and the upper and lower parts are welded together by ultrasonic, which is resistant to high pressure and does not have the problem of product leakage. Needle filter is widely used in the laboratory. It does not need to change the membrane and clean the filter, which saves the complex and time-consuming preparation work. It is mainly used for sample pre filtration, clarification and particle removal, liquid and gas sterilization and filtration. It is the preferred method for filtering small amounts of samples from HPLC and GC

the clamping part of the jaw is divided into two types: dynamic gripping and hydraulic gripping

classification of disposable needle filter

1 Classification of liquid properties: aqueous phase filtration; Organic phase filtration

2. Filter phase classification: gas phase filtration; Liquid phase filtration

3. Filtration purpose or process classification: sterilization filtration; Clarification and filtration; Pre filtration; Particle removal filtration

4. Interface form: female bayonet; Formula socket

5 Overall dimension: 4mm13mm17mm25mm if it does not refer to zero, adjust the pointer position 30mm33mm50mm, etc.

6 Filter layer structure: single-layer membrane structure; Multilayer structure; Capillary structure

7 Hydrophobic polytetrafluoroethylene filter membrane (PTFE): it is used for air, gas and hydrophobic chemicals. There is an upsurge of research on aluminum lithium alloy, rapidly solidified heat-resistant aluminum alloy and aluminum matrix composites. Real time multitask operation system is adopted for filtration to realize three closed-loop controls of load, deformation and displacement

common filter material characteristics of disposable needle filter

1 Polytetrafluoroethylene membrane is made of PTFE, which is completely natural and permanently hydrophobic. Even under a very low pressure difference, it can ensure the unimpeded passage of moist air or other gases, while the aqueous solution cannot pass through. Its performance is just opposite to that of hydrophilic membrane. PTFE filter membrane has strong chemical compatibility and is competent for the filtration of almost all organic solvents and strongly corrosive chemicals. When it is necessary to filter the aqueous solution with PTFE filter membrane, the aqueous solution can be filtered only after pre soaking with ethanol or isopropanol

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

3. Nylon filter membrane (polyamide, nylon): used for filtering alkaline solutions and organic solvents

nylon membrane has very good mechanical strength, strong adsorption, can withstand most organic solvents and most alkaline solutions, and is especially suitable for the filtration of alkaline solutions. For organic solvent filtration, such as HPLC mobile phase particle 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 be used for the filtration of culture medium or biological samples such as protein solution, so as to avoid the loss of samples due to adsorption. In this case, cellulose acetate membrane (CA) with low adsorption is usually used, which is more suitable

4. Thermal sprayed fiber flat film PP is classified into isotactic and atactic polypropylene due to the difference in the spatial arrangement of molecular chains. At room temperature, it can withstand most chemical solvents except strong oxidants; Applied to impurities or particles in liquids or gases. It is not used for sterilization and filtration, but only for clarification and filtration

df film has excellent heat resistance and chemical stability. It is not corroded by acids, bases, strong oxidants and halogens at room temperature, and is stable to aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes and other organic solvents. Hydrophilic PVDF is widely used in sterilization and filtration in biopharmaceutics because of its low protein adsorption and less precipitates. Positively charged PVDF can be used to remove endotoxin

disposable needle filter application

lc sample preparation

2 Routine QC analysis

3 Remove protein sediment

4 Dissolution determination

5 Food analysis

6 Biofuel analysis

7 Environmental testing

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