Tableware and Kitchenware

Crystalline glass is a lead-free crystal glass with high optical brilliance, developed for high-quality applications in the tableware sector. Through the addition of metal oxides such as barium, zinc, or titanium oxide, it achieves a crystal-like light refraction – completely without lead, which is a health concern.

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

Special feature in the manufacturing process of crystalline glass:

To achieve the desired brilliance 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 more strongly refracted and reflected.

Additionally, the manufacturing process focuses on maximum purity and uniform distribution of ingredients – the smallest impurities or streaks would compromise the optical quality. The cooling process is also stress-relieved and controlled to permanently secure the 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 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 cost-effective production are required. Soda-lime glass is food-safe, but has limited resistance to thermal shock.

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

Soda-lime glass allows for energy-efficient and cost-effective mass production due to its relatively low melting point (approx. 1,400°C). The glass mass is easy to shape and process, both mechanically and manually. Industrial production is usually carried out using the float glass or pressing process, where the glass is produced and formed in a continuous melt.

To avoid bubbles and inclusions, the melt is treated with fining agents and then cooled in a stress-free manner through controlled cooling zones. Technically, homogeneity is achieved through controlled melting, continuous stirring, and precise temperature zones, with the requirements being less stringent than for optically demanding glasses like 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 sound. In more modern variants, lead is increasingly being replaced by other oxides to meet health and environmental requirements.

Lead crystal is primarily used for high-quality tableware, cut glasses, vases, carafes, and decorative elements where shine, engravability, 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 created by the targeted addition of lead oxide, which significantly increases the refractive index and makes the material softer – ideal for engraving and cutting. Due to this composition, lead crystal is significantly denser and heavier than other types of glass, but also more susceptible to chemical cleaners and thermal shocks.

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

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

Borosilicate glass is a particularly temperature- and chemical-resistant glass characterized by an increased content 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 tasteless, 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 the laboratory sector and the focus in packaging is more on formability and mass production, the focus for kitchen glass is on everyday usability, break resistance, and optical quality.

Special feature 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 requires correspondingly heat-resistant melting plants and precise temperature control. The glass mass is viscous, which makes the forming process – e.g., press-blow or centrifugal casting – technically more demanding.
High-purity raw materials, uniform stirring, and long melting times are crucial for a stable structure and low thermal expansion. Stress-free cooling ensures the durability and dimensional accuracy of the finished products – particularly 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 usability, and decorative effect are to be combined – for example, in cups, plates, bowls, or children's dinnerware.

Opal glassware is particularly popular in canteens, schools, hospitals, or family households because it is hygienic, break-resistant, and visually versatile.

Distinction from opal glass in the container sector:
While opal glass in the packaging industry primarily serves for 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 feature in the manufacturing process of opal glass:

The typical opacity is created by adding opalescent components such as fluorides or phosphates to the melt. During the controlled cooling process, these crystallize in a targeted manner, causing the light to be micro-finely scattered 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 – making it robust, thick-walled, and impact-resistant. The surface can also be tempered or coated to further increase its resistance to daily use.

Glass products for the kitchen and table setting combine functionality, aesthetics, and hygiene at a high level. Depending on the type of glass, products can be specifically developed that withstand high stresses in everyday use while also impressing with their design and feel. However, glass as a material is not without its limits – especially when compared to plastics or metals.

• Flavor Neutrality: Glass does not absorb flavors or release substances – ideal for food contact
• Heat Resistance (depending on the type of glass): 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 any loss of appearance
• Durability with proper use: No yellowing, no material fatigue like with plastics
• Recyclability: Glass is 100% recyclable without loss of quality
• Added Visual Value: High transparency, brilliance, or color effects visibly enhance the table setting

• Sensitivity to Impact: Glass remains a brittle material - strong mechanical impacts lead to breakage
• Weight: Especially with thicker or crystal-containing glass, the weight is significantly higher than that of plastic or melamine
• Low Flexibility: Once shaped, glass can only be mechanically processed with great effort (e.g., drilling, cutting)
  
• Thermal Shock (for soda-lime glass): Not every type of glass can withstand rapid temperature changes – cracking is possible
• Cost (depending on the type of glass): 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

Glass tableware combines function and aesthetics: It remains flavor-neutral and hygienic, withstands high temperatures (depending on the type of glass), and is dishwasher-safe. At the same time, glass brings clarity, brilliance, and color effects to the table – from a purist transparent drinking glass to a decorative bowl. Durable, completely recyclable, and visually high-quality.