Use-by or expiry date 

Use-by or expiry date informs users that the stated assay (guarantee of purity) of the (unopened) reagent cannot be relied upon after the stated date.

Concentration expressions

M – molar concentration, molarity is the number of moles of solute (the material dissolved) per litre of solution mol dm-3 or simply M.
N - normality is a measure of concentration equal to the gram equivalent weight per litre of solution.
% - one part in a hundred
v/v – volume by volume, both chemicals in solution are liquids
w/v – weight by volume, solid chemical dissolved in a liquid
w/w – weight by weight, the weight of each chemical is used and not the volume.
Vols. - hydrogen peroxide is given in terms of the volume of oxygen it can produce (100 vol hydrogen peroxide can produce 100 cm3 of oxygen gas).

Useful documents:

• DfE Safe storage and disposal of hazardous materials and chemicals November 2017
• Home Office SYC Secure Your Chemicals Education
• The SYC Assessment Tool

Regulations Table:

Common Name:
A common name is defined by the IUPAC (International Union of Pure and Applied Chemistry) as a name that unambiguously defines a chemical yet does not follow
the current systematic naming convention. An example of a common name is Acetaldehyde, which has the systematic name Ethanal. e.g. Acetaldehyde

Systematic or IUPAC Name:

The systematic name also called the IUPAC name is the preferred way to name a chemical because each systematic name identifies exactly one chemical. The systematic name is determined by guidelines set forth by the IUPAC. e.g. Ethanal

Acetaldehyde LR:

LR - LABORATORY REAGENT: This grade consists of Pure, Extra Pure, Purified, organic and inorganic chemicals having reliable accuracy in routine laboratory analysis.
AR - ANALYTICAL REAGENT: Reagents essential for analytical purpose and research work having high purity.

Assay:

Chemical purity - typically determined from the amount of impurities present. e.g. 98% min

Density: Mass per unit volume: density = mass/volume. e.g. 0.788g/ml

M.W: Molecular weight is the sum of the atomic weight values of the atoms in a molecule. e.g. 44.05

Hazard Statements:

Hazard Statements (H-Statements) are part of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Hazard statements provide standardised wording to indicate the hazards of a product including, when appropriate, the degree of the hazard. e.g. H224, H351, H319, H335.

Precaution Statements:

Precaution Statements (P-Statements) are part of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Precautionary statements provide standardised wording and/or pictograms to describe recommended measures that should be taken to minimise or prevent adverse effects resulting from exposures to a hazardous product, or improper storage, handling, or disposal of a hazardous product.
e.g. P233, P280, P261, P301+P310, P331

Signal Words:

CLP uses a signal word to highlight the danger level. The new signal word has two levels: Danger — those substances and mixtures with the most severe hazards;
Warning — those substances and mixtures with less serious hazards.

Pictograms:

Under CLP, the seven familiar orange squares with symbols have been replaced by nine new red-bordered diamond symbols. Six of these new symbols are very similar, but, as seen below, there are three new or changed ones to become familiar with.

Flash Point

The flashpoint of a chemical is the lowest temperature at which its vapours ignite if given an ignition source. A lower flash point indicates higher flammability.

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