E-glass
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Introduction
Milled E-glass (glass (amorphous silica) consisting of SiO2, Al2O3, CaO, MgO, B2O3, F2, Na2O, K2O, Fe2O3) is produced from an industrial E-glass side stream. Milled E-glass can be characterised by:
- ‘Green’ attributes, as a product of an industrial side stream.
- Relatively high Mohs hardness of 6.
Advantage over quartz and cristobalite and certain feldspar grades: free of labelling, milled E-glass grades can be used as an alternative when labelled grades of other mineral fillers are no longer permitted or wanted.
Basic properties
| Property | Value | Unit |
| Moisture | 0.2 | [%] |
| pH | 9 | [-] |
| Hardness (Mohs) | 6 | [-] |
| Refractive index | 1.57 | [-] |
| Colour (D65/ 10°) L* | 93 | [-] |
| L.O.I. | 0.5 | [%] |
| Density | 2.6 | [kg/ dm3] |
PORTAFILL G is the product range for Sibelco’s milled E-glass. Portafill G grades can be used as a crystalline silica free alternative E-glass. Consists of products with a defined PSD, hard, compact, low oil absorption and good chemical inertness. It is used in gel coat formulations to improve the abrasion resistance and in sealants to replace quartz flour.
