Tableware and Kitchenware

Crystalline glass is a lead-free crystal glass with high optical brilliance, developed for high-quality applications in the tableware sector. By adding metal oxides such as barium, zinc, or titanium oxide, it achieves a crystal-like light refraction – entirely without health-hazardous lead.

It is primarily used for wine glasses, carafes, decanters, and decorative items where transparency, luster, and sound quality are paramount. Crystalline glass is food-safe and, depending on the recipe, even dishwasher-safe.

Special features in the manufacturing process of crystalline glass:

To achieve the desired luster and characteristic sparkle, the refractive index is specifically increased by optically active metal oxides. These alter the light path within the material by influencing the glass structure in such a way that light is refracted and reflected more strongly.

Additionally, the manufacturing process focuses on maximum purity and uniform distribution of ingredients – even the smallest impurities or streaks would impair optical quality. Cooling also occurs with low stress and in a controlled manner to permanently ensure high clarity.
Technically, this is achieved through the use of high-purity raw materials, special stirrers in the melt, and precise temperature control during melting and homogenization.

Soda-lime glass – also known as soda-lime glass – is the most commonly used type of glass worldwide. It consists mainly of silicon dioxide (SiO₂), sodium oxide (Na₂O), and calcium oxide (CaO) and forms the basis for most everyday glass products in the kitchen and household sector.

It is used for drinking glasses, storage containers, casserole dishes or bowls – wherever good formability, transparency and economical production are required. Soda-lime glass is food-safe, but only has limited resistance to temperature changes.

Special feature in the manufacturing process of soda-lime glass:

Soda-lime glass enables energy-efficient and cost-effective production in large quantities, as it has a comparatively low melting point (approx. 1,400 °C). The glass mass can be easily shaped and processed, both mechanically and manually. Industrial production usually takes place using the float glass or pressing method, in which the glass is produced and shaped in a continuous melt.

To avoid bubbles and inclusions, the melt is treated with degassers and then cooled stress-free via controlled cooling zones. Technically, homogeneity is achieved through controlled melt guidance, continuous stirring and precise temperature zones, with lower requirements than for optically demanding glasses such as Crystalline or Borosilicate.

Lead crystal – traditionally also called crystal glass – is a decorative glass with particularly high optical brilliance. It usually contains between 10% and 30% lead oxide (PbO), which is responsible for the typical light refraction, high weight, and clear, ringing tone. In more modern variants, lead is increasingly being replaced by other oxides to meet health and ecological requirements.

Lead crystal is primarily used for high-quality tableware, cut glass, vases, carafes, and decorative elements where brilliance, engraving capability, and traditional character are paramount. The high light dispersion gives the glass its characteristic depth and well-known sparkle.

Special feature in the manufacturing process of lead crystal:

The high optical effect in lead crystal is achieved through the targeted addition of lead oxide, which significantly increases the refractive index and makes the material softer – ideal for engraving and grinding. Due to this composition, lead crystal is significantly denser and heavier compared to other types of glass, but also more susceptible to chemical cleaners and temperature shocks.

Lead crystal is mostly processed using manual methods – many products are mouth-blown or hand-cut. The material allows for very fine decorations and individual cuts, which makes it particularly popular with designers and glass refiners.

Technically, its production requires particularly clean lead incorporation into the melt, uniform temperature control, and careful cooling. Storage and further processing often take place under stricter conditions than for standard glass – especially due to the heavy metal components.

Borosilicate glass is a particularly temperature and chemical-resistant glass, characterized by an increased proportion of silicon dioxide (SiO₂) and boric anhydride (B₂O₃). In tableware, it is used wherever glass products must withstand strong temperature changes or acidic foods – for example, in baking dishes, teapots, measuring cups, or glass lids.

It is taste-neutral, hygienic, scratch-resistant, and dishwasher-safe – ideal for daily use in the kitchen, oven, and microwave.

Important to know: The composition of borosilicate glass in tableware differs significantly from that in technical applications or the container sector. While maximum chemical purity is required in laboratories and formability and mass production are prioritized in packaging, the focus for kitchen glass is on everyday usability, break resistance, and optical quality.

Special features in the manufacturing process of borosilicate glass:

Compared to standard glass, borosilicate glass has a higher melting point (approx. 1,500 °C to 1,600 °C) and accordingly requires heat-resistant melting furnaces and precise temperature control. The glass mass is viscous, which makes the forming process – e.g., in press-blow or centrifugal casting – technically more demanding.
For a stable structure and low thermal expansion, high-purity raw materials, uniform stirring, and long melting times are crucial. Stress-free cooling ensures the durability and dimensional accuracy of the finished products – especially important for baking dishes or heat-stressed lids.

Opal glass – also known as milk glass – is a translucent glass with a milky-white or colored appearance that allows light to pass through without being transparent. In tableware, it is primarily used where functionality, everyday suitability, and decorative effect are to be combined – for example, in cups, plates, bowls, or children\'s dinnerware.

Glassware made of opal glass is particularly popular in canteens, schools, hospitals, or family households, as it is hygienic, break-resistant, and optically versatile.

Distinction from opal glass in the container sector:
While opal glass in the packaging industry primarily serves light shielding and brand aesthetics, the focus in tableware is on mechanical robustness, heat resistance, and dishwasher suitability. The composition and manufacturing process are therefore adapted to the demands of everyday kitchen use – not to thin-walled shaping or decorative print finishing.

Special features in the manufacturing process of opal glass:

The typical opacity is created by adding opacifying components such as fluorides or phosphates to the melt. During the controlled cooling process, these crystallize out in a targeted manner, scattering light micro-finely and creating the well-known milky effect. To ensure that the color effect and light scattering remain uniform, precise control of the temperature profiles throughout the entire production process is necessary.

In tableware manufacturing, the glass is usually processed using the pressing method – robust, thick-walled, and impact-resistant. The surface can also be hardened or coated to further increase resistance in daily use.

Glass products for the kitchen and dining table combine functionality, aesthetics, and hygiene at a high level. Depending on the type of glass, products can be specifically developed to withstand high daily stresses while also impressing with their design and feel. Nevertheless, glass as a material is not infinitely versatile – especially compared to plastics or metals.

• Neutral taste: Glass does not absorb flavors and does not release substances – ideal for food contact
• Heat resistance (depending on glass type): Borosilicate or glass-ceramic withstand strong
• Temperature changes, e.g., when baking or heating
• High surface hardness: Smooth, scratch-resistant surfaces are easy to clean and hygienic
• Dishwasher safe: Many types of glass are permanently dishwasher safe without optical degradation
• Durability with proper use: No yellowing, no material fatigue like with plastics
• Recyclability: Glass is 100% recyclable without loss of quality
• Optical added value: High transparency, brilliance, or color effects visibly enhance the dining table

• Impact sensitivity: Glass remains a brittle material - strong mechanical impacts lead to breakage
• Weight: Especially with thicker or crystal-containing glass, the intrinsic weight is significantly higher than with plastic or melamine
• Low flexibility: Once formed, glass can only be mechanically processed with great effort (e.g., drilling, cutting)
  
• Thermal shocks (with soda-lime): Not every glass can withstand rapid temperature changes – cracking is possible
• Costs (depending on glass type): High-quality materials like borosilicate or crystalline glass are significantly more complex to manufacture
• Danger from fragments: Broken glass can be sharp-edged and poses a risk of injury

Glassware combines function and aesthetics: It remains taste-neutral and hygienic, withstands high temperatures (depending on the type of glass), and is dishwasher safe. At the same time, glass brings clarity, shine, and color effects to the table – from puristically transparent drinking glasses to decorative bowls. Durable, completely recyclable, and optically high-quality.