ForewordScopeNormative referencesTerms and definitionsPrincipleDetermination of mass per unit areaDetermination of fibre mass per unit areaMethod A: Extraction in Soxhlet-type apparatusMethod B: Extraction by immersion in solvent in a beakerMethod C: Decomposition by loss on ignitionMethod D: Extraction by wet combustionMethod E: Method by calculationApparatus and reagentsGeneralFor Method AFor Method BFor Method CFor Method DConditioning and testingConditioningMaterials for which no conditioning is requiredConditioning of material stored at ambient temperatureConditioning of material stored at below ambient temperatureTestingTest atmosphereTime interval between conditioning and testingMaterials not requiring conditioningMaterials requiring conditioningTest specimensShape and dimensionsNumberPreparationProcedureDetermination of mass per unit areaMaterials made without using a solventMaterials made using a solventDetermination of fibre mass per unit areaMethod A: Extraction in Soxhlet-type apparatusMethod B: Extraction by immersion in solventMethod C: Decomposition by loss on ignitionMethod D: Extraction by wet combustionMethod E: Method by calculationExpression of resultsMass per unit areaMaterials made without using a solventMaterials made using a solventFibre mass per unit areaMethod A: Extraction in Soxhlet-type apparatusMethod B: Extraction by immersion in solventMethod C: Extraction by decomposition by loss on ignitionMethod D: Extraction by wet combustionMethod E: Method by calculationPrecisionMass per unit areaFibre mass per unit areaTest report