NAUTILUS MARINE SERVICE GmbH was founded in 1986; the company is registered in Bremen, Germany. NAUTILUS is subsidiary company of
RF Forschungsschiffahrt Gmbh, BremenVITROVEX® glass floatation spheres and instrument housings
Glass has properties which make it perfectly destined for deep-sea use. It’s
corrosion resistance, it’s lightness, it’s chemical, electrical and magnetic
inertness and it’s optical qualities add up to a valuable combination.
VITROVEX® is a 3.3 borosilicate glass with standardised physical, chemical,
electrical and optical properties, also well known as DURAN®. Its very low
potassium content (<0.5%) results in low K40 content.
It is moulded into spheres and thick wall tubes by means of intricate processing
and thermal post-treatments.
Country of origin and manufacture is Germany. VITROVEX® is made by the well
experienced JENAer Glaswerk, Jena, a member of the SCHOTT-group..
| Base resistivity | <= 150 mb/dm2 |
| Acid resistivity | <= 0.7 mg/dm2 |
| Water resistivity (base emittance) | <= 31µg Na2O / g glass |
Optical Properties
| Refractive Index nd | 1,472 |
| dispersion nf – nc | 72,6 x 10-4 |
| stressoptical coefficient | 3.5 x 10-12 m2/N |
| transmission (8 mm at 500 nm) | 90 % |
| attenuation (8 mm at 500 nm) | <1 dB |
| Young‘s modulus | 64 Gpa |
| thermal coefficient of expansion | 3.3 x 10-6/ °K |
| Specific gravity at 20°C | 2,23g/cm3 |
| Poisson’s ratio | 0.2 |
| Thermal conductivity | 1.2 W/m x °K |
| Specific heat | 980J/kg x °K |
