Platinum Feeder
What can a Platinum Feeder do?
A platinum feeder is a specially designed forehearth whose glass-contacting components are made entirely or partially of platinum or platinum alloys. It is used where the highest demands are placed on chemical purity, temperature stability, and material resistance – especially for special and high-performance glasses.
In contrast to conventional feeders with refractory lining, the noble metal itself takes on the function of the glass-guiding surface in a platinum feeder. This is not a cosmetic detail, but a constructive difference with a direct impact on product quality and process stability.
In the production process, the platinum feeder simultaneously performs several central tasks. First, it ensures precise temperature conditioning of the glass melt across the entire cross-section and ensures that the desired viscosity window is precisely maintained. At the same time, the homogeneous heat distribution contributes to the uniform setting of temperature and flow properties.
Platinum Feeder // IWG Glass Furnace Construction
Platinum Feeder
Through the targeted design of the platinum-contacting components, the glass flow is controlled and guided with minimal disturbance. Flow irregularities, turbulence, or dead zones are constructively minimized, ensuring constant gob formation or uniform fiber drawing. The smooth, chemically resistant surface reduces interactions between melt and material to a technically necessary minimum.
Furthermore, the platinum feeder from IWG significantly contributes to ensuring the highest product quality. Inclusion formation, bubbles, or material-related contaminations are significantly reduced, enabling stable production even with sensitive glass formulations. The precise coordination of thermal properties, material, and geometry is always application-specific.
IWG platinum feeders are particularly designed for optical glasses, borosilicate glasses, technical special and high-performance glasses, as well as applications in fiberglass production where purity, dimensional accuracy, and process consistency are top priorities.
Glass Conditioning
Platinum Feeder Data Sheet
Technical Glass
E-Glass, Borosilicate Glass,
Neutral Glass, Display Glass,
Glass Ceramic
Kitchen Glass
Crystal Glass, Lead Crystal, Opal Glass, Borosilicate Glass
Glass Containers
Borosilicate Glass,
Opal Glass
Art Glass
Lead Crystal,
Crystal Glass
Technical Background of Platinum Feeders
Glass melts place high demands on all glass-contacting materials. Especially boron-containing, highly alkaline, or technically modified formulations react chemically with classic refractory materials. This attack occurs continuously over the entire campaign duration and does not remain without consequences for product quality and plant stability.
Typical effects of conventional materials are:
- Discharge of foreign particles into the melt
- Formation of corrosion products with risk of inclusion
- Change in surface structure and thus flow behavior
- Local temperature deviations due to material degradation
While these effects are partly tolerable in mass production, they immediately lead to quality losses in high-quality special glasses. Optical defects, mechanical weakening, or functional limitations are the direct consequence.
Platinum and platinum-rhodium alloys offer decisive advantages here. The precious metal is chemically almost inert to most glass melts and is characterized by high temperature resistance and excellent dimensional stability. Essential properties are:
- Very high corrosion resistance
- Low interaction with aggressive glass melts
- Smooth, flow-optimized surface
- Long-term geometric stability
This drastically reduces interactions between glass and lining and sustainably increases process reliability.
Function of Platinum Feeders in the Process
In the production process, the platinum feeder simultaneously performs several central tasks. First, the precise temperature conditioning of the melt takes place. The temperature profile is precisely set across the entire cross-section, ensuring that the defined viscosity window is stably maintained.
Essential process functions are:
- Uniform temperature control
- Homogeneous adjustment of viscosity and flow properties
- Reduction of thermal gradients
- Stabilization of the glass flow
Due to the smooth and chemically stable surface of the platinum, the glass flow is guided calmly and controllably. Dead zones or turbulence are constructively minimized.
This directly affects downstream processes, such as:
- Constant droplet formation
- Uniform fiber drawing
- Reproducible shaping
- Improved dimensional accuracy
In addition, the platinum feeder significantly contributes to quality assurance. The risk of inclusions, bubbles, or material-related contaminations is significantly reduced. Especially with optical glasses, technical special glasses, or glass fibers, even the smallest inhomogeneities lead to:
- Increased reject rates
- Limitations in transparency
- Mechanical weakening
- Functional performance deviations
The precise conditioning in the feeder thus directly determines the performance of the entire production line.
The platinum feeder operates in the most sensitive temperature and viscosity range of the entire production line. Even minimal deviations in this section directly affect product quality, reject rates, and process stability.
Constructive Designs of Platinum Feeders
The design of a platinum feeder is always application- and throughput-dependent. Different concepts are used depending on the type of glass, temperature range, and quality requirements.
Typical variants are:
- Fully platinum-lined channels
- Partially platinum-lined critical zones (e.g., outlet areas)
- Electrically heated platinum bushings
- Hybrid solutions with a ceramic base structure and platinum-lined inserts
These concepts allow for targeted adaptation to:
- Chemical load of the melt
- Temperature profile in the feeder
- Required throughput
- Economic conditions
The decision is always a technical and economic consideration. Platinum is a costly material, whose use is sensible where:
- Extreme chemical stress is present
- Highest purity is required
- Process stability has absolute priority
- Alternative materials reach their limits
Distinction from Standard Feeders
A platinum feeder is not a general standard solution, but a specialized answer to particularly demanding applications. In classic container or mass production, proven refractory systems work economically and reliably.
- The use of platinum is primarily justified when:
- Highest optical quality is required
- Technical or functional properties are critical
- Scrap is economically intolerable
- Maximum process consistency is necessary
Where purity, dimensional accuracy, and long-term stability are required at the highest level, the platinum feeder becomes the technically clean and process-reliable solution.
Platinum feeders are designed application-specifically – from fully platinum-lined channels to hybrid solutions with selectively platinum-lined zones, tailored to glass type, temperature profile, and throughput. Their use is technically justified where highest purity, extreme chemical stress, or maximum process stability are required and standard refractory solutions reach their limits.
IWG Glasofenbau – Your Partner for Platinum Feeders in Glass Tanks and Glass Furnaces
IWG Glasofenbau stands for application-specific solutions in the field of glass tanks, forehearths, and feeder technology. In the sensitive segment of platinum feeders, IWG does not develop standard products, but precisely designed systems that are exactly tailored to the glass type, throughput, temperature control, and quality requirements.
The integration of a platinum feeder always takes place in the overall context of the furnace and tank system. Thermal simulation, material selection, and constructive detailed planning interlock to ensure stable conditioning of the melt. Both chemical stress and economic conditions are taken into account. The goal is not a maximum amount of platinum, but a technically sensible, durable, and economically justifiable solution.
IWG accompanies projects from the analysis of existing plants to the planning of new lines, to the retrofitting or optimization of existing systems. The focus is on process stability, service life, and reproducible product quality. Especially for optical, technical, or high-purity glass types, the precise design of the platinum feeder determines the performance of the entire glass tank and the connected furnace system.