Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Water solubility

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Although some material can be extracted from the fibre (measured as 4.53 mg/L with respect to silicon only), the fibres appear to be unchanged. The mass of extracted silicon per surface area of the microfibre has been calculated to be 0.623 mg/m2.

As the fibres remain essentially intact, the test item was considered to be insoluble at pH7.

Key value for chemical safety assessment

Additional information

A fibre is a water insoluble particle with an aspect ratio (length/diameter>3) and diameter smaller than 100 um. FMMVF fibres fulfil these granulometric criteria and evaluated as highly insoluble in water.

The substance under consideration in this dossier does not strictly speaking dissolve in water. Any gravimetric estimation of weight loss in water is complicated by fibres being retained at the meniscus by surface tension effect and adherence to any glass surface, so that recovery rarely exceeds 90%.