Open Source · Free
Z
Zach v1
Glass science platform — from composition to properties, grounded in physics.
What It Does
Zach v1 is an open-source web application for the quantitative science of glass. Given a glass composition, it predicts viscosity curves, characteristic temperatures (Tg, softening, annealing, strain points), and key physical properties — using both theory-based models and ML models trained on hundreds of thousands of experimentally measured glasses.
In Action
Glass Informatics Dashboard — 419,377 glasses from the SciGlass database
The Science
MYEGA Viscosity Model
Mauro–Yue–Ellison–Gupta–Allan (2009) model captures the low-temperature
departure from Arrhenius behavior by accounting for configurational entropy
and structural relaxation — critical for accurate Tg and working-range prediction.
log η = log η∞ + (12 − log η∞) · (Tg/T) · exp[…]
Topological Constraint Theory
Counts bond-stretching and bond-bending constraints per atom from composition.
Under-constrained networks are floppy; over-constrained are rigid and brittle.
TCT predicts Tg, elastic moduli trends, and durability directly from oxide chemistry.
NBO/T — Network Connectivity
Non-bridging oxygens per tetrahedra quantifies how modifiers (Na₂O, CaO…)
depolymerize the silicate/borate network. Predicts viscosity class, chemical durability,
and crystallisation tendency from first principles.
ML Property Prediction
Ensemble models trained on 300,000+ compositions from the SciGlass database.
Predicts density, CTE, refractive index, and Tg for arbitrary oxide compositions —
including multi-component and specialty glasses outside empirical rule coverage.
Features
Glass database explorer (SciGlass, 300k+ entries)
Viscosity fitting: MYEGA, VFT, Avramov–Milchev
Characteristic temperature extraction (Tg, Tsoftening, Tstrain)
Inverse design: target properties → composition
Ternary composition diagrams
Batch calculator: oxide → raw materials
Optical basicity & Sun bond strength analysis
Fully open-source — extend, fork, build on it
Who Uses It
Glass manufacturers
R&D laboratories
Specialty glass designers
Universities & researchers
Refractory engineers
