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Organic Membrane
https://www.jiuwumembrane.com/organic-membranes/
The organic membrane is a material having a selective separation function, and when there is a driving force on both sides of the membrane (such as a pressure difference, a concentration difference, a potential difference, etc.), the raw material component selectively permeates the membrane. Separation, classification, concentration and purification of different liquid or gas components can be achieved by selective separation of membranes. Since no morphological changes are required, membrane separation techniques are particularly suitable for separation processes without phase change and chemical change. Widely used in medicine, biology, food, petrochemical, energy, water treatment and other fields, resulting in huge economic and social benefits.
Membrane materials are the basis and core of membrane technology. The properties and chemical structure of membrane materials play a decisive role in membrane separation performance. There are many types of membranes according to different classification methods.
a. The pore size of the membrane
According to the size of the hi tech membrane pore size or the size of the retained particles, it can be divided into Microfiltration (MF), Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmotic (RO).
b. The material of the membrane
The material of the membrane determines the chemical properties of the membrane, which determines the main chemical properties such as hydrophilicity, anti-contamination, acid and alkali resistance, grease resistance, organic solvent resistance, high-temperature resistance and sunlight resistance.
It is stronger the hydrophilicity of the membrane, the higher the anti-contamination property; It is better the chemical stability of the membrane, the stronger the acid and alkali resistance and the stronger the oxidation resistance, the better the durability of the membrane.
Depending on the material of the membrane, the membrane can be divided into an inorganic membrane and an organic membrane.The organic membrane is made of high molecular materials are processed and compounded, such as polyvinylidene fluoride, polyvinyl chloride, polyethersulfone, polysulfone, polypropylene, polyethylene, polyacrylonitrile, aromatic polyamide, cellulose acetate, and the like. The organic membrane has a wide range of selectivity, and can be selectively made into various membranes according to different uses, different properties, and different molecular cutting amounts, but when the raw materials have strong acid, alkali, strong corrosive, high temperature and high concentration organic pollution characteristics. At the time, the organic membrane is prone to corrosion and clogging of the membrane pores. The main features of the organic and inorganic membranes are compared as shown in the following table:
c. The configuration of the membrane
The configuration of the membrane is related to its manufacturing process, and is generally classified into a hollow fiber membrane, a flat membrane, a tubular membrane, and a spiral membrane.
If you want to know more kinds of organic membrane filters, please visit our website.
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BTW, for those who are looking for BG, here is the instructions from DBS.
https://www.dbs.com.sg/personal/support/loans-bankers-guarantee-application.html?pid=sg-dbs-pweb-locator-txtlink-applying-bankers-guarantee-for-individuals
Apply for Banker’s Guarantee
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Learn more about the list of documents required and how to apply for Banker's Guarantee at the branch.
How to Apply for Banker’s Guarantee
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You and the joint-accountee (if any) will be required to be present at the branch, with all the required documents for the application.
List of documents required:
1. You must have a fixed deposit account with us, with a placement of deposit equivalent to the BG amount and an auto-renewal maturity instruction.
2. Banker’s guarantee format must be editable (e.g. Microsoft Word format). Please refer to the requesting party (NSF/MOE etc) and provide any letter from the requesting party (if any).
3. Copy of your .....
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Thanks a lot " Auslander83". I'll try to be in touch with [email protected]. This is the response I received when I contaced them recently.
Hope it will be useful for others to know the process.
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(1) Under the Enlistment Act (Chapter 93), all male Singapore citizens and Permanent Residents aged 13 years and above are required to comply with the Exit Permit requirements.
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For PE aged 16.5 and Above before enlistment to NS
For any overseas trip with a duration of more than 3 months, an Exit Permit and a Bond are both required
Bond Requirements if applicable -
Your parents/guardians will need to .....
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