Determination of boron (III) oxide in refractory products - Determination of total boron (III) oxide in oxidic materials for ceramics, glass and glazes1 Scope This part of ISO 21078 specifies methods of determining boron(III) oxide in refractory products and raw materials, in mass fractions of 0,01 % or greater. It is applicable to the determination of total boron(III) oxide in oxidic materials for ceramics, glass and glazes. The determination of boron(III) oxide is carried out using one of the following four methods: a) alkaline titrimetry, which is applied to samples containing more than 0,5 % by

relative humidity

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Methods and programmes for routine monitoring within cleanrooms are not covered in detail in this part of ISO 14644 but reference is made to ISO 14644-2 and ISO 14644-3 for monitoring particles and ISO 14698-1 and ISO 14698-2 for monitoring micro-organisms

Pertaining to circular tubes

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c) Oxygen in nitrogen mixtures (Nitrox)

9 Testing with a hearing aid

1 mg/l and higher