Crucibles & Evaporating Dishes

High-Purity PTFE and PFA Crucibles & Evaporating Dishes for Demanding Chemical Workflows

Laboratory vessels used for evaporation, digestion, concentration, and sample storage can directly affect analytical quality, operator safety, and process repeatability. In workflows involving strong acids, strong bases, oxidizers, organic solvents, or ultra-trace analytes, conventional glass, metal, and lower-grade plastic containers may introduce contamination, suffer chemical attack, retain residues, or create handling limitations. KINTEK designs and manufactures PTFE and PFA crucibles, evaporating dishes, and related fluoropolymer vessels to solve these challenges with a material platform built around chemical inertness, purity, durability, and custom engineering flexibility.

Our Crucibles & Evaporating Dishes category includes practical vessels for routine wet chemistry as well as specialized components for highly controlled sample-preparation environments. It covers shallow PTFE evaporating dishes, standard PTFE evaporating dishes, lidded PTFE and PFA crucibles, small-volume digestion crucibles, graphite-heating-block-compatible crucibles, custom conical sample cells, triangular fluoropolymer containers, PTFE Petri dishes, corrosion-resistant evaporation and electrophoresis cells, and complementary PTFE beakers. While each geometry serves a different workflow, the shared objective is consistent: maintain sample integrity while providing reliable containment for chemically aggressive media.

Built for chemical resistance and sample integrity

PTFE and PFA are high-performance fluoropolymers valued in laboratories because they are exceptionally resistant to a broad range of chemicals. These materials are suitable for many applications involving mineral acids, alkaline solutions, halogen-containing reagents, organic solvents, corrosive process liquids, and demanding cleaning procedures. Their low surface energy also creates a naturally non-stick surface that helps reduce sample adherence, simplifies cleaning, and supports more efficient material recovery after evaporation or digestion.

For trace analysis, background control is often as important as chemical compatibility. When measuring trace and ultra-trace elements, contamination can arise from leachable metals, vessel corrosion products, retained residues, or transfer between samples. High-purity PTFE and PFA vessels are selected specifically to reduce these risks. Their chemically stable fluoropolymer surfaces help laboratories establish cleaner preparation pathways for samples destined for ICP-MS, ICP-OES, atomic absorption, ion analysis, elemental analysis, and related techniques. Properly matched vessel design, cleaning protocol, reagent grade, and handling practice remain essential, but high-purity fluoropolymer labware provides a strong foundation for contamination-conscious work.

KINTEK crucibles and dishes are designed to support laboratories that need dependable performance without accepting a one-size-fits-all vessel. We can provide designs with practical features such as matching lids, tailored capacities, thicker walls, altered profiles, special diameters, custom depths, equipment-compatible bases, and precision-machined functional details. This helps users replace difficult-to-source vessels, adapt a standard workflow to a new sample type, or create a dedicated component for a proprietary method.

PTFE crucibles for digestion, heating, and high-purity preparation

PTFE crucibles are widely used when samples must be exposed to corrosive reagents during digestion, dissolution, reaction, or controlled heating. A lidded crucible can help limit airborne contamination, reduce splash risk, and provide more controlled handling during multi-step preparation. The lid is particularly useful in laboratories processing low-concentration samples, volatile reagent systems, or batches that require a covered interval between additions, heating, cooling, and transfer.

Our PTFE crucibles are available for applications such as:

• Acid digestion for environmental, geological, metallurgical, food, pharmaceutical, and industrial samples
• Sample preparation before ICP-MS, ICP-OES, AA, and other elemental-analysis methods
• Evaporation and concentration of acid solutions or process liquids
• Hot-plate heating and controlled wet-chemistry reactions within appropriate temperature limits
• Small-volume preparation where low background and easy recovery are priorities
• Graphite-block-heating workflows requiring compatible outer dimensions and vessel geometry
• Corrosion-resistant processing of strong acids, strong bases, and solvent-containing mixtures
• High-purity laboratory procedures in semiconductor, materials-science, and research environments

PTFE is particularly useful where chemical robustness and economical, durable vessel construction are required. It is well known for excellent resistance to many corrosive media and for its non-wetting, easy-clean surface. For workflows with more demanding thermal conditions, a need for greater transparency, or a preference for specific forming and handling characteristics, PFA crucibles may be an appropriate alternative. KINTEK can help evaluate the vessel material and design according to chemical exposure, heating method, temperature, capacity, purity requirement, and operating sequence.

The term "crucible" can mean different things across laboratory disciplines. In some settings, it refers to a vessel for acid digestion or hot-plate concentration rather than a ceramic container for very high-temperature combustion or fusion. PTFE and PFA are high-performance polymers, not refractory ceramics. Their maximum use temperature and suitability depend on the specific polymer grade, vessel design, heating method, chemical system, duration of exposure, and operating conditions. For this reason, KINTEK works with customers to select an appropriate fluoropolymer vessel for the actual process instead of making broad assumptions based on a product name alone.

Evaporating dishes that improve control during sample concentration

Evaporation is a common step in analytical preparation and chemical processing. Users may need to reduce sample volume, concentrate analytes, remove a solvent, prepare a residue for reconstitution, or bring a digest toward a target volume before dilution. An effective evaporating dish needs a stable profile, useful open surface area, resistance to the working chemicals, and a surface that can be cleaned thoroughly between runs.

KINTEK PTFE evaporating dishes are available in standard and shallow configurations. A shallow dish provides a broad exposed surface that can support efficient evaporation in workflows where the selected heating method and process conditions allow it. Standard dish geometries may be preferred when users need a different balance of capacity, splash control, surface area, and handling comfort. The smooth fluoropolymer surface helps reduce residue retention, which is valuable when recovering a concentrated sample or preparing vessels for the next high-purity batch.

Typical uses for PTFE evaporating dishes include:

• Concentrating samples before instrumental analysis
• Evaporating acid or solvent systems in controlled laboratory procedures
• Preparing residues for gravimetric, spectroscopic, or subsequent dissolution steps
• Holding corrosive solutions during staged reaction or transfer operations
• Supporting sample washing, rinsing, soaking, and cleaning procedures
• Handling high-purity reagents and process solutions where vessel contamination must be minimized
• Performing research-scale chemical development with aggressive media

The correct evaporation vessel is not determined by capacity alone. Dish diameter, depth, base thickness, wall profile, lip geometry, and compatibility with the heat source can all affect usability. For example, a larger-diameter shallow dish may favor surface exposure, while a deeper profile may be better suited to applications where operators need greater liquid containment. A thicker PTFE structure can provide a more robust handling profile, while an equipment-specific base may improve seating on a particular hot plate or heating block. KINTEK can customize these physical details to fit the workflow rather than requiring the workflow to fit an off-the-shelf component.

Related specialty fluoropolymer vessels for complete workflows

Many laboratory processes do not start and end with a crucible or dish. Samples may need to be collected, stored, mixed, evaporated, separated, digested, or transferred through several vessels. This category therefore also includes specialty PTFE and PFA containers that extend the same high-purity, corrosion-resistant material advantages into adjacent stages of sample preparation and process development.

PTFE Petri dishes provide chemically resistant, low-background, reusable surfaces for specialized laboratory tasks. Unlike conventional disposable culture dishes, fluoropolymer Petri dishes are often selected for trace-analysis work, handling corrosive media, membrane casting, controlled drying, sample observation, or applications where chemical inertness matters more than optical clarity. Available diameters such as 60 mm, 80 mm, 90 mm, and 200 mm can be customized when a specific instrument, process fixture, or sample volume requires a different dimension.

Conical sample cells and triangular containers offer a geometry tailored to certain small-volume, transfer-sensitive, or instrument-related workflows. A custom conical base can help guide liquid toward a collection point, while a triangular or application-specific design can integrate more effectively with a laboratory fixture, holder, or process sequence. Precision CNC machining makes it possible to create features that standard molded containers cannot easily provide, including custom wall thicknesses, ports, lips, seating surfaces, notches, internal cavities, or dimensional interfaces.

Evaporation cells, hydrolysis cells, and electrophoresis-related vessels bring fluoropolymer chemical resistance to more specialized reaction and separation environments. These components may require defined capacity, insulation-related geometry, thicker walls, customized openings, or functional integration with external equipment. KINTEK can manufacture these vessels around the operational requirements of your process, including solution volume, reagent exposure, thermal conditions, electrode or tubing interfaces, and required handling features.

PTFE beakers complement crucibles and dishes in workflows that require mixing, temporary holding, reagent preparation, washing, or transfer. A beaker with an optional lid can be useful for controlled storage and for reducing incidental contamination before a sample moves into an evaporating dish or digestion crucible. Larger thick-walled PTFE beakers can also support corrosive-fluid handling and preparation steps where conventional labware is not adequate.

Why fluoropolymer vessels are preferred in corrosive and high-purity applications

The practical advantages of PTFE and PFA are grounded in their fluorinated molecular structure. Strong carbon-fluorine bonds contribute to their chemical stability, while the materials' low surface energy creates a surface that resists wetting and adhesion by many substances. In day-to-day laboratory use, this combination translates into vessels that are easier to clean, less prone to chemical attack from compatible media, and better suited to applications where a vessel's own contribution to the sample must be minimized.

Key advantages include:

• Excellent chemical inertness: PTFE and PFA are compatible with a wide range of aggressive chemical systems, supporting work with acids, bases, solvents, and reactive solutions within validated operating conditions.
• Low-background performance: High-purity fluoropolymer construction helps reduce risks associated with metallic contamination and leaching, making these vessels appropriate for trace-sensitive analytical workflows.
• Non-stick surfaces: Low surface energy can reduce sample retention, simplify rinsing, and make cleanup more efficient after evaporation, digestion, or reagent exposure.
• Corrosion resistance: Fluoropolymer vessels do not rust and are not subject to the same corrosion mechanisms as metallic containers in chemically aggressive environments.
• Thermal stability for appropriate heating processes: PTFE crucibles and dishes can support many controlled hot-plate and heating-block procedures when temperature limits, heating uniformity, and process conditions are respected.
• Mechanical durability: Properly designed thick-walled or machined PTFE parts provide robust service for repeated laboratory handling and industrial use.
• Customizable geometry: CNC machining enables non-standard diameters, depths, capacities, lids, ports, profiles, and system-specific interfaces.
• Reusable laboratory value: For suitable processes, durable fluoropolymer vessels can be cleaned, conditioned, and used repeatedly, supporting long-term laboratory operations.

It is important to distinguish material capability from process validation. Chemical compatibility and thermal performance should be confirmed for the actual reagent concentration, temperature, exposure time, pressure condition, heating method, and mechanical load. Laboratories should use suitable ventilation, personal protective equipment, established chemical-safety practices, and validated operating procedures. KINTEK can provide technical input on vessel selection, but users should evaluate the complete process conditions before implementation.

Selecting the right crucible or evaporating dish

A successful selection begins with the process rather than the catalog dimension. First consider the sample volume, expected final volume, reagent type, and whether the operation is digestion, evaporation, storage, mixing, reaction, or transfer. Next, consider the heating approach. Hot plates, graphite heating blocks, water baths, ovens, and custom fixtures impose different geometric and thermal requirements. Finally, define the analytical cleanliness target. A routine chemical-processing vessel may need a different design and cleaning standard than a vessel used for ultra-trace elemental analysis.

For a straightforward application, a standard PTFE evaporating dish or lidded crucible may be the most efficient solution. For an established method using a dedicated heating block, a precisely dimensioned small-volume crucible can reduce setup variation and improve operational consistency. For a custom instrument, semi-automated station, or unique reaction sequence, a CNC-machined PTFE or PFA component may be more appropriate than modifying a standard vessel by hand.

Useful details to define when requesting a product recommendation or quotation include:

• Required material: PTFE, PFA, or a material recommendation based on your process
• Nominal and working volume
• Required diameter, height, depth, wall thickness, and tolerance
• Lid requirement, lid style, and any venting or access features
• Reagents, concentrations, and anticipated temperature range
• Heating method, heating-block dimensions, and equipment interfaces
• Purity and contamination-control requirements
• Number of units, prototype needs, and expected annual quantity
• Required custom features, such as ports, threads, flanges, handles, notches, labels, or mounting provisions

Providing these parameters early helps our engineering team propose a vessel that is practical to manufacture, reliable in service, and appropriately aligned with your process. It also reduces the risk of receiving a container that is chemically compatible but operationally inconvenient.

KINTEK custom manufacturing for PTFE and PFA labware

KINTEK is exclusively focused on high-performance fluoropolymers and manufactures a broad range of PTFE and PFA laboratory supplies, fluid-transfer components, sample-preparation tools, and custom chemical-processing assemblies. This specialization matters because fluoropolymer fabrication requires attention to material behavior, dimensional control, machining strategy, wall thickness, thermal expansion, sealing interfaces, and application-specific cleanliness.

Our custom CNC machining capability supports both individual non-standard parts and scalable production requirements. We can work from a drawing, sample, sketch, dimensional table, or a clear description of the intended use. Whether you need to replace an obsolete vessel, adapt a crucible to a graphite block, create a deeper evaporation dish, add a custom lid, develop a specialized conical sample cell, or build a complete fluoropolymer laboratory setup, our team can help translate application requirements into a manufacturable component.

Custom manufacturing can be especially valuable when standard labware introduces recurring problems, such as poor fit on a heating platform, insufficient capacity, difficult sample recovery, unsupported lid geometry, excessive contamination risk, or poor compatibility with an existing apparatus. Instead of accepting compromises in a critical workflow, users can specify a fluoropolymer vessel designed around their operating conditions.

Contact KINTEK to discuss your crucible, evaporating dish, or custom PTFE/PFA vessel requirement. Send your drawings, target dimensions, sample volume, chemical environment, heating method, and quantity needs, and our fluoropolymer specialists will help develop a practical, high-purity solution for your laboratory or industrial process.