Lead-free and arsenic-free special short flint glass

Details Lead-free and arsenic-free special short flint glass Lead-free and arsenic-free special short flint glass

2006-05-09

2006-05-09

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S070000, C501S072000

Reexamination Certificate

active

07041612

ABSTRACT:
The invention describes a lead-free and arsenic-free special short flint glass with a refractive index 1.60≦nd≦1.65, an Abbe number of 41≦νd≦52, a relative partial dispersion 0.551≦PgF≦0.570 in the blue spectral region, a relative partial dispersion 0.507≦PCs≦0.525 in the red spectral region, a negative deviation of the relative partial dispersion from the normal line ΔPg,F≦−0.0045 and an improved chemical resistance which has the following composition (in % by weight):SiO2>50–65  Al2O30–7B2O30–6Li2O0–6Na2O 3–11K2O0–6MgO 0–12CaO 1–12BaO0–8La2O3 0–15Ta2O5 0–10Nb2O5 4–20ZrO2>10–20  Σ(CaO + MgO + BaO) 1–25Σ(Na2O + K2O + Li2O) 3–20SiO2/(ZrO2+ La2O3+ Nb2O5+ Ta2O5)1.5–2.3.

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