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Specifications

Technical data

Important information for processing our glass. For questions, contact patrik@banasglass.com

Specifications

Chemical-Physical
glass composition data

The glass batch for melting our colored glass shares a uniform chemical base. This ensures high compatibility across our entire portfolio.

100% Lead-Free

Thermal Points

Melting temperature 820 – 860 °C
Annealing point 475 °C
Deformation point 545 °C
Thermal expansion COE 101 α 20-300 °C 10 · 10-6 K-1

Physical Properties

Melting capacity approx. 250 kg
Block format 20×20×2.5 cm
Specific gravity 2.5 kg/l
*

Blocks may contain minor bubbles. This is a natural occurrence of the hand-casting technology.

Universal Annealing Curve
Universal annealing curve graph for Banas Glass
Portfolio

Wide Palette
of Color Options

From crystal-clear transparents to deep opals. Each shade is mixed with an emphasis on purity and color stability during melting.

Crystals

Clear and tinted

Yellows & Topazes

Warm shades

Blues & Violets

Cold spectrum

Aquamarines

Water tones

Greens

Natural shades

Alexandrites & Roses

Red spectrum

Grey Combinations

Smoky effects

Uranium Glass

UV active

Opals

Opaque glass

Uranium Glass

UV Active

Glass with uranium additives reacts to the ultraviolet spectrum of light (sunlight, halogen, UV lamps) and produces a distinctive green fluorescent effect.

Certified Safety

The uranium content is strictly below 1%. According to SÚJB (State Office for Nuclear Safety) measurements, the glass does not emit measurable radiation and is completely safe for health.

Striking Colors

Heat Sensitive

Specific oxides develop and shift their shade during heat treatment (e.g., from light violet to deep brown-red). Crystallization and color shifting occur at critical heat thresholds.

Critical temperature: 500 – 600 °C
Affected color codes
601 602 603 604 607 607×2 608 609 610 813 814 817
Processing

Compatibility
& Color Mixing

All of our colors are fully compatible and can be fused (melted together), with the exception of the codes listed below, which have a different chemical base.

Incompatible colors (do not mix):

200 200/U 207 207/2 221 222 223 OP OP-M OP-U ALB

Risks of Color Mixing

When creating a kiln-cast glass sculpture using multiple colors, there is a risk of internal stress. Even with precise thermal expansion compatibility, each color possesses slightly different thermal properties (such as heat absorption).

  • The larger the object, the greater the residual stress.
  • We highly recommend performing an expansion test on a small sample.
  • Inspect the joints under a polariscope.
Palette of glass color samples – compatible batch glass for mixing
Color Palette

Samples for Mixing

Choose from our wide range of compatible colors to create your own unique kiln-cast glass sculpture.

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