H-PZ33 Low Expansion Glass
H-PZ33 is a low expansion borosilicate glass characterized by high light transmittance, excellent thermal stability, excellent mechanical hardness, and excellent chemical durability. H-PZ33 has become the glass of choice for MR11 reflectors, MR16 reflectors, UHP lamps, parabolic aluminized reflectors, telescope mirrors, and any application where a low coefficient of thermal expansion is called for.
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|H-PZ33 Physiochemical Properties |
|Refractive index (nd) ||1.47200 |
|Dispersion (nF- nC) ||0.00719 |
|Coefficient of Linear thermal expansion (x10-6/°C) ||3.25 |
|Thermal conductivity (W/(m * °C)) ||1.14 |
|Average thermal capacity (KJ/ (kg * °C)) ||0.83 |
|Maximal operation temperature (°C) |
|Density (g/cm3) ||2.23 |
|Elastic modulus E (kN/mm3) ||64 |
|Hardness (HK) ||480 |
|Poission's Ratio ||0.2 |
|Climatic resistance (ISO - 719 - HGB) ||Grade 1 |
|Acid resistance ||Grade 1 |
|Alkali resistance ||Grade 1 |
|Melting temperature (°C) ||1680 |
|Working Point (°C) ||1252 |
|Softening Point (°C) ||820 ± 10 |
|Annealing Point (°C) ||560 ± 10 |
|Stress Point (°C) ||510 ± 10 |
|Surface Tension (dyn/cm) ||340-350 (1252 °C) |
|Dielectric constant (1MHz, 20°C) ||4.6 |
|Dielectric loss (1MHz, 20°C) ||37 x 10-4 |
|Dielectric strength (50MHz, 25°C) Kv/mm ||16 |
|Color Code (λ5/λ80) ||297.6/337.2 |
|Volume Sensitivity (log ρ) |
|Environmental Protection ||Pb < 50 ppm |
As < 5 ppm
Cd < 5 ppm
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