Paraformaldehyde for industrial use — Methods of test — Part 4: Determination of water-insoluble mat...
The principle of the procedure consists in the dissolution of a test sample in a highly diluted sodium hydroxide solution, filtration by using a tared filter crucible, drying of the residue at (100 2) °C. Determination of the in water insoluble substances by differences. - ISO 1391, Parts 1 to 4, replace ISO Recommendation R 1391-1970.
Fall-Arresting Safety Belts and Lanyards for the Construction and Mining
Industries
Scope
1.1 This Standard defines fall arresting safety belts of the tongue buckle
type and lanyards. It may be applied to an assembly consisting of a
belt with an attached lanyard, or to a belt alone, or to a lanyard
alone.
Note: Requirements for quick-release and friction buckle types of belts
are under study.
1.2 The equipment specified…
Hydrochloric acid for industrial use — Determination of total acidity — Titrimetric method
The principle consists in titration of a test portion with a standard volumetric solution of sodium hydroxide in presence of bromcresol green as indicator. Replaces ISO Recommendation R 904-1968.
Hydrochloric acid for industrial use — Evaluation of hydrochloric acid concentration by measurement ...
Specifies the determination of density at 20 °C by means of a hydrometer. Evaluation of the corresponding concentration by means of a table. Replaces ISO Recommendation R 905-1968.
Hydrochloric acid for industrial use — Determination of sulphate content — Barium sulphate gravimetr...
The method is applicable to products having sulphate contents equal to or greater than 0,1 % (m/m). The principle consists in precipitation of the sulphates contained in a test portion as barium sulphate in diluted hydrochloric acid medium. Separation of the precipitate obtained and ignition of the residue in an electric furnace, amintained at (800 +- 25 ) °C, and weighing. Replaces ISO…
