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Depending on the intended use, it is necessary to consider the exact specification of purity or quality when ordering chemicals.
degrees of purity in English at mychem.ch (there are others):
1. "technical": All chemicals without an additional designation (e.g. "sodium chlorite") are considered "technical"
2. "pure"
3. "puriss"
4. "pheur"
Information on the purity grades:
1. technical quality
Products without or with the purity designation "technical" usually have an "impure" content. They are produced on an industrial scale and may have a foreign smell and color. Their content of e.g. heavy metals such as lead etc. is usually relatively high. They are used for general technical purposes.
2. pure (purum), i.e. chemically pure quality
- Minimum content 97 %, unless a different content in % is specified
- Suitable for synthesis and laboratory purposes
3. puriss = of the highest purity possible
These are substances of particularly pure quality, so that with normal chem. Analysis methods can no longer detect any foreign substances.
4. "pheur" or "Ph. Eur."
are the common spellings for the European Pharmacopoeia. Ph. Eur. is a collection of official standards which, once published, provide a legal and scientific basis for the quality control of substances for pharmaceutical use and of medicinal products during the development, production and marketing processes.
However, the respective purity is not standardized and is determined by the respective manufacturer. The exact specification of two chemicals of apparently identical purity does not have to be identical. It always depends on the manufacturer.
In most cases Food quality less pure than "puriss" and "Ph Eur". "Ph Eur" describes the quality of medicinal products and their ingredients, which are subject to the strictest purity and quality standards. Food quality, on the other hand, refers to the suitability of substances for food processing and thus human consumption and may have a certain tolerance for certain impurities that are not permitted for analytical purposes, for example.
Instructions for use
In the safety data sheets and additional information you will sometimes find a usage note for the substance. Under no circumstances should you interpret this as a restriction on use. Instructions for use "for microscopy" or "for biochemical purposes" merely state that certain specifications are specially adapted to these applications.
Depending on the intended use, it is necessary to consider the exact specification of purity or quality when ordering chemicals.
degrees of purity in English at mychem.ch (there are others):
1. "technical": All chemicals without an additional designation (e.g. "sodium chlorite") are considered "technical"
2. "pure"
3. "puriss"
4. "pheur"
Information on the purity grades:
1. technical quality
Products without or with the purity designation "technical" usually have an "impure" content. They are produced on an industrial scale and may have a foreign smell and color. Their content of e.g. heavy metals such as lead etc. is usually relatively high. They are used for general technical purposes.
2. pure (purum), i.e. chemically pure quality
- Minimum content 97 %, unless a different content in % is specified
- Suitable for synthesis and laboratory purposes
3. puriss = of the highest purity possible
These are substances of particularly pure quality, so that with normal chem. Analysis methods can no longer detect any foreign substances.
4. "pheur" or "Ph. Eur."
are the common spellings for the European Pharmacopoeia. Ph. Eur. is a collection of official standards which, once published, provide a legal and scientific basis for the quality control of substances for pharmaceutical use and of medicinal products during the development, production and marketing processes.
However, the respective purity is not standardized and is determined by the respective manufacturer. The exact specification of two chemicals of apparently identical purity does not have to be identical. It always depends on the manufacturer.
In most cases Food quality less pure than "puriss" and "Ph Eur". "Ph Eur" describes the quality of medicinal products and their ingredients, which are subject to the strictest purity and quality standards. Food quality, on the other hand, refers to the suitability of substances for food processing and thus human consumption and may have a certain tolerance for certain impurities that are not permitted for analytical purposes, for example.
Instructions for use
In the safety data sheets and additional information you will sometimes find a usage note for the substance. Under no circumstances should you interpret this as a restriction on use. Instructions for use "for microscopy" or "for biochemical purposes" merely state that certain specifications are specially adapted to these applications.
