FAQ about chemical reagents




What is CAS?

Chemical Abstracts Service (CAS) is a subdivision of the American Chemical Society. This is the only worldwide organization that finds, collects and processes all of the publicly available information about chemical compounds.

What is a CAS registry number?

Most commonly described as CAS RNS or CAS number. This is a registry number assigned by the Chemical Abstracts Service (CAS) to a particular chemical compound. International organizations and some countries use the CAS number as an international code for a specific chemical compound.

What is a Material Safety Data Sheet (MSDS)

Material Safety Data Sheets (MSDS) are used to convey information about the hazards and occupational safety related to a particular chemical in the chemical supply chain. These sheets allow the end user to undertake all of the necessary means related to the safety of the workers and of the environment.

What is a Certificate of Analysis?

Certificate of Analysis is prepared by the quality control department of a particular manufacturer. This document proves that the product in question fully conforms to its specification.

At what temperature should the chemicals be stored?

Chemicals are usually stored at room temperature unless otherwise noted on the label, in the certificate of analysis or in the specification of the product.

Are chemical products repacked into smaller packages?

The chemicals are provided only in those packages that are offered by the represented manufacturers. We do not repack chemicals in order to fully maintain the purity and the properties of the product.

Why is the product delivered at room temperature when it is supposed to be stored in a refrigerator/freezer? Does it still retain its original properties?

Chemicals that should be stored in the refrigerator/freezer for extended periods of time can be shipped at room temperature when it is known that short term exposure (8-10 days) to room temperature will not alter the properties of the product. If the product is affected even by short term exposure to higher temperatures it is always shipped in ice or dry ice.

Do you provide samples of laboratory chemicals?

Usually no, unless the sample is provided by the represented manufacturer. Samples may or may not be free of charge. For more information about samples please contact the representing manager.




FAQ about laboratory equipment




What do the numerical markings of the NS ground glass joints mean?

Usually a ground glass joint is marked using AA/BB nomenclature where AA denotes the outside diameter of the joint at the widest part in mm and BB denotes the length of the ground glass joint in mm.

What is the difference between Luer Lock and Luer Slip syringe joints.

Luer Lock joint has a thread to hold the needle in place while Luer Slip joint holds the needle purely by friction between the female and the male part of the joint.

What kind of gloves should be used for work with aggressive chemicals?

This choice strongly depends on the particular chemicals that are being used. Please refer to the chemical resistance table provided at http://eetd-safety.lbl.gov/sites/all/files/VWR%20Chemical%20Resistance%20Gloves%20Chart.pdf

What kind of laboratory plasticware should be used for work with aggressive chemicals?

This choice strongly depends on the particular chemicals that are being used. Please refer to the chemical resistance table provided at https://www.buerkle.de/media/files/Downloads/Chemical_resistance_EN_2015.pdf

What kind of vials are best suited for my chromatography system?

The choice depends solely on the particular autosampler that is used together with the system. A chromatograpy vial and autosampler compatibility table can be found at http://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma/General_Information/vials_brochure.pdf

What kind of septum is best suited for my application?

Septa are made from various materials and come in different shapes, sizes and colors. A best option can be chosen according to the information provided at http://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma/General_Information/vials_brochure.pdf

What is sterilization by gamma rays?

Sterilization by gamma ray exposure is used for the sterilization of an already packed product. The whole package with the product is exposed to high energy electromagnetic radiation that destroys bacteria and parasites. This is a chemical free sterilization method that leaves no radioactive residue.

What is the difference between soda lime glass and borosilicate glass?

Soda lime glass is manufactured from silica, sodium hydroxide or carbonate and lime. This glass is inexpensive and easy to manufacture and it is suitable for routine applications that do not involve high temperatures or rapid changes of temperature. Borosilicate glass is manufactured from silica and boron compounds. This glass exhibits a low thermal expansion quotient and is resistant to thermal shock however its more difficult and expensive to manufacture. Products made from borosilicate glass are suitable for precision work and for demanding laboratory applications.

What kind of membrane is best suited to filter samples before chromatography?

The choice depends on the solvent that is used for sample preparation and on the composition of the mobile phase. A membrane compatibility table is provided at http://frisenette.dk/media/upload/file/Kompatibilitetstabel.pdf

Do you provide samples of laboratory equipment?

Usually no, however many examples of laboratory equipment are stored in our warehouse. For more detailed information about the stock please contact the representing manager.

Do you store a supply of laboratory equipment in your warehouse?

Many pieces of routine equipment are stored in the warehouse however for more detailed information about the stock please contact the representing manager.