Drops 12mm – Sintered Glass for Mosaic

The Essence of Sintered Glass: Physics and Optics

The Drops 12mm, also known as Optic Drops, are fundamentally different from traditional mosaic glass due to their unique production process. These are not molten or cast glass tiles, but sintered ceramic solidifications – a fusion of durability, technological precision, and optical brilliance.

Perfect Geometry Through Sintering

Each Drop is precisely formed into a uniform circle with a diameter of exactly 12mm (½ inch). The most defining feature is the profile: the Drops have a perfectly flat base ensuring stable adhesion to the substrate, while the surface rises spherically to a peak of approximately 8mm (⅓ inch) thickness in the center, with sides starting at 5-6mm (¼ inch) at the edge.

The Optical Magic: Gloss and Lustre

The aesthetic appeal of the Optic Drops is enhanced by the available finishes. Each mix contains 70% gloss (glossy) and 30% lustre (pearlescent), creating a dynamic interplay of light reflection.

Gloss (Glossy): This finish provides a vibrant, high-gloss appearance with a mirror-like effect. This maximizes the reflection of ambient light, making spaces appear brighter and optically larger.

Lustre (Pearlescent/Iridescent): The lustre finish is technically more complex. It is achieved by applying microscopically small metal particles (such as copper or silver nanoparticles) in the glaze layer. Instead of direct reflection, this chemical structure creates an iridescent, colored metallic sheen, resulting in an opalescent shimmer and a "glittering glow."

The Dome as a Lens

The convex (dome) shape of the Drops acts as a miniature lens. Unlike a flat tile that reflects light, the dome refracts and scatters light over a wider angle. This effect increases the optical depth, making colors appear richer and more saturated. Working with this convex shape elevates a mosaic project to an architectural level, comparable to the luxurious look of high-end design mosaics.

The Unique Sintering Process: Technical Superiority

The sintering process is the fundamental factor behind the mechanical superiority and perfect uniformity of the Optic Drops, making it a crucial distinguishing feature for the mosaic expert.

Sintering Explained: Fusion Without Full Melting

Sintering, or frittage, is a method where materials are not melted to liquidity. The process begins by compressing fine recycled glass powder, to which mineral oxides are added to achieve the desired color. This powder is then heated under high pressure at elevated temperatures that are significantly lower than the melting point of the glass.

Under this controlled heat and compression, the atoms and molecules of the glass powder diffuse across particle boundaries, fusing into a dense, homogeneous crystalline solid mass. Because the process does not require full liquefaction, the producer can exercise precise control over the microstructure of the final material.

Comparison with Traditional Glass Production

The sintered process offers demonstrable technical advantages over traditional methods:

• Raw Material: Fine recycled glass powder vs. large glass chunks/cullet – offers cleaner, 100% recycled sourcing and finer color control.
• Production Temperature: Low (below melting point) vs. high (full liquidity) – significantly lowers the ecological footprint and is more energy-efficient.
• Uniformity: Exceptionally uniform and consistent vs. variable – crucial for precise and professional mosaic patterns.
• Mechanical Strength: Very high (due to controlled fusion under pressure) vs. good but dependent on casting and cooling process.

Technical Specifications

Dimensions and Weight

• Diameter: 12mm (½ inch)
• Thickness at edge: 5-6mm (¼ inch)
• Thickness in center: 8mm (⅓ inch)
• Shape: Perfectly round with flat base and convex top
• 50g: approx. 33 pieces
• 500g: approx. 330 pieces

Finish

• Mix composition: 70% gloss (shiny) and 30% lustre (pearlescent/iridescent)
• Each Drop: Single finish (either gloss or lustre)
• Color stability: Through-colored with mineral oxides

A Sustainable Origin: From Waste to Art

The origin of the Drops 12mm is embedded in the principles of the circular economy, combining technological superiority with environmental responsibility.

100% Recycled Material

These Drops are manufactured exclusively from 100% recycled scrap glass, sourced from both post-industrial and post-consumer waste (known as cullet or fine glass powder). This production process plays a crucial role in waste reduction, giving glass that would otherwise be discarded—and take over a million years to decompose in a landfill—a second life as an elegant, functional product.

Glass is naturally a sustainable material because it is indefinitely recyclable; its chemical properties remain unchanged no matter how many times it is reused. The use of 100% recycled raw materials makes the Optic Drops a conscious, sustainable choice for creative projects.

Environmental Benefits through Sintering

The environmental benefits of the Optic Drops go beyond just the recycled material and are inherently linked to the unique sintering process. Compared to traditional production methods where glass must be brought to a molten state, the sintering technique requires significantly lower temperatures. This is because the powdered material is densified and heated below the full melting point.

This technical difference leads to a significantly lower ecological footprint. The use of recycled glass powder combined with the energy-efficient sintering process reduces total energy consumption and associated CO₂ emissions during production. Furthermore, modern sintering processes avoid harmful chemical additives, and some manufacturers have even developed production processes that are completely waterless.

Mechanical and Chemical Strength

The Optic Drops are designed to last for years in creative projects, making the investment in mosaic art a sustainable choice.

Extremely High Mechanical Strength

Thanks to the combination of compressed glass powder and fusion, sintered Drops exhibit exceptionally high mechanical strength and durability. They are resistant to pressure changes, making them suitable for both delicate art objects and more robust applications like decorative tabletops and garden art. This guarantees that mosaics retain their structural integrity even with daily use.

Thermal and Chemical Stability

The chemical inertness of sintered glass is a decisive advantage. The Drops are resistant to most acids, alkalis, and organic solvents. This chemical stability is crucial for installations near strong cleaning agents or in humid environments.

Furthermore, the Optic Drops boast high thermal stability, making them heat-resistant and capable of withstanding extreme environments. The crystalline structure formed during the sintering process lends the material superior thermal shock resistance.

Waterproof and Non-Porous

One of the key advantages of sintered glass tiles is their completely non-porous structure. The sintering process for mosaic tiles is optimized for maximum densification, resulting in a completely impermeable material. As a result, the tiles do not absorb moisture or stains, ensuring superior performance in wet and chemically challenging environments.

The Optic Drops are impervious to water, frost, and sunlight, making them suitable for:

• Wet areas: Shower walls, bathrooms, and kitchen backsplashes
• Water features: Fountains and birdbaths in the garden
• Outdoor applications: Garden art, patios, facades – resistant to freeze-thaw cycles

Working with Drops 12mm

Important Note: Do Not Cut

Adhesives and Mounting

The flat side of the Drops is the bonding surface. The convex shape creates specific requirements for the adhesive:

Adhesive selection by application:

• Glass substrate (glass-on-glass): Clear silicone sealant or special glass glue – waterproof, flexible, dries clear. Essential to maintain light transmission.
• Exterior/wet areas/curved surfaces: Cement-based with acrylic additive – can be applied thickly to bed the convex form, offers very strong, waterproof adhesion.
• Interior, general (wood, ceramic): Wood glue or PVA – stronger than standard craft glue, non-toxic, for interior use only.

The Role of Grout

Grout is vital for the durability of any mosaic, as it fills gaps, encases the tiles, and provides structural strength. Due to the round shape of the Drops, a natural joint is always automatically created between pieces, even when placed against each other.

It is essential to ensure the grout fully beds the edges of the convex drops, guaranteeing long-term structural integrity. Use grout suitable for glass mosaic and follow the manufacturer's recommendations for drying time and application.

Creative Applications in Mosaic Art

The Drops 12mm invite a specific creative approach that embraces the unique convex shape and perfect uniformity.

The Aesthetics of the Convex Form

Rounded shapes naturally create a soft, fluid aesthetic that guides the eye and breaks the often hard angles of interior designs. Using the small, symmetrical drops adds texture and dynamic movement to a surface. Laying a multitude of these circles generates a subtle, rhythmic pattern.

The creative power of these mosaic rounds lies in the duality between their perfect geometric uniformity (due to the sintering process) and their inherent roundness. This combination allows for the creation of complex, flowing color transitions and organic patterns, while the overall texture of the work remains soft and inviting.

Andamento with Round Shapes

Andamento is the direction and flow of the tesserae, a fundamental element in classical mosaic art. The perfect round shape of the Drops offers unique possibilities:

• Concentric patterns: Circles within circles for mesmerizing effects
• Flowing lines: Use the Drops to suggest soft, organic movement
• Dot painting technique: Perfect for Aboriginal-inspired patterns
• Borders and accents: Ideal for finishing mosaic edges

Combination with Other Materials

The Drops have a consistent thickness (rising to 8mm) and can be combined with other mosaic materials. This allows artists to create layered textural effects within a harmonious work. The contrast between the convex, shiny Drops and flat or matte tiles adds visual interest and depth.

Specific Applications

• Mosaic artworks: Paintings, panels, and wall decorations with striking light effects
• Decorative objects: Embellish flower pots, vases, mirrors, photo frames, and trays
• Garden art: Decorative stepping stones, birdbaths, plant markers, and garden ornaments
• Jewelry boxes and chests: Give small boxes and chests a unique, personal touch
• Tabletops and coasters: Create functional art for the home
• Mixed media projects: Combine with other materials in creative compositions

Frequently Asked Questions

What is the difference between sintering and melting?

In sintering, glass powder is fused under high pressure and elevated temperature, but without fully melting into a liquid. This results in a stronger, more uniform material with lower production temperatures. In traditional melting, glass is brought to full liquidity, which costs more energy and offers less control over the microstructure.

Can I cut these Drops?

It is strongly discouraged. The rounded surfaces make it difficult to get a clean cut line, and cutting would compromise the optical properties and structural integrity. These Drops are designed to be used whole.

What does 70% gloss and 30% lustre mean?

This means that in every mix, 70% of the Drops have a glossy finish with mirror-like reflection, and 30% have a lustre (pearlescent/iridescent) finish with a shimmering, opalescent glow. Each individual Drop has a single finish – not both – but the mix contains both types.

How many Drops do I need for my project?

That depends on your design area. As a guideline: 50g contains approx. 33 pieces, 500g approx. 330 pieces. For coverage: with a diameter of 12mm, about 70-80 Drops cover an area of 10x10cm (depending on grout width). Always calculate 10-15% extra for waste and reserve material.

Are the Drops suitable for outdoor use?

Yes, absolutely! The Drops are UV-resistant, frost-resistant, and completely water-resistant. The sintered structure and mineral colorants ensure they do not fade, crack, or discolor when exposed to weather and temperature fluctuations.

Do I need to seal the Drops after installation?

No, that is not necessary. Due to the completely non-porous structure, the Drops do not absorb moisture, dirt, or stains. They are naturally impermeable and retain their appearance for decades without the need for sealing.

What is the advantage of the convex shape?

The convex shape acts as a miniature lens that refracts and scatters light. This increases optical depth and makes colors appear richer and more saturated. It also adds a three-dimensional texture to the mosaic, creating tactility and visual interest that flat tiles cannot offer.

Are all Drops exactly the same?

Yes, one of the major advantages of the sintering process is the exceptional uniformity. Each Drop is consistent in size (12mm diameter), shape (perfectly round), and profile (flat base, convex top up to 8mm). This precision is crucial for tight, professional mosaic patterns.

Which glue should I use?

That depends on your application: for glass-on-glass use clear silicone sealant, for outdoor projects and wet areas use cement adhesive with acrylic, for general indoor use on wood or ceramic use PVA wood glue. See the section "Adhesives and Mounting" for detailed recommendations.

What does "through-colored" mean?

This means that the mineral oxides that provide the color are mixed throughout the entire glass powder before it is sintered. The result is that the color runs through the entire mass of the Drop – not just on the surface. If damaged, the color remains intact.