DWK 240463 WHEATON Black Phenolic Screw Cap, PTFE-Faced 14B Rubber Liner, 15-415

The WHEATON® 240463 is a 15-415 black phenolic solid-top screw cap with a PTFE-faced 14B rubber liner. Its closure design combines a phenolic cap body, chemically resistant PTFE contact facing, and resilient styrene-butadiene rubber backing.

Successful closure selection requires more than matching a nominal cap size. The container's thread finish, liner material, sealing rim, sample chemistry, and application conditions must be considered together.

No product-specific application torque, quantified leak-rate specification, liner thickness tolerance, cap-height tolerance, or certified external diameter is established in the reviewed catalog information.

The 15-415 designation identifies the cap's nominal screw-thread finish. The first number refers to the nominal closure diameter designation; the second identifies the thread-style specification.

DWK explains that the thread finish on a closure and container must correspond. For example, a 15-415 cap should be used with a compatible 15-415 neck finish.

A 15-425 closure may share the same nominal diameter designation but has a different thread style. It must not be assumed to provide proper engagement, liner compression, or sealing on a 15-415 container.

DWK's Closure Liner Guide describes its PTFE/14B construction as virgin PTFE bonded to white sulfur-cured styrene-butadiene rubber. The guide identifies a nominal 0.005-inch PTFE facing for this general liner type.

The PTFE-facing material and the underlying rubber perform different functions. The PTFE helps provide the chemically resistant contact surface, while the rubber backing permits the liner to compress against the container rim.

PTFE is widely used for its chemical resistance, and DWK describes the facing in this liner design as an inert sample-contact surface.

However, product compatibility depends on more than the PTFE-facing material. The laboratory should evaluate the sample's potential contact with the liner edge, rubber backing, cap body, and other parts of the assembly under actual use conditions.

The manufacturer's general liner description does not establish a universal solvent rating, extractables specification, or approved storage duration for every sample.

The three WHEATON closures below share black phenolic construction and PTFE-faced rubber liners, but differ in thread finish.

All three have a solid-top phenolic cap and are manufacturer-listed as autoclavable. Nevertheless, each uses a different catalog identity or thread finish.

The sample-contact facing and backing material both influence closure selection. DWK offers several liner constructions with different mechanical and chemical characteristics.

These are general material comparisons, not claims that each liner type is available in a particular 15-415 cap. Confirm the catalog-specific configuration before ordering.

The cap functions by compressing its liner against the mouth of a compatible container. The effectiveness of this interface depends on the liner condition, rim geometry, thread engagement, and closure application procedure.

DWK recommends testing closure liners for leak-resistant applications. It does not establish a universal torque range or leakage limit for every container used with WHEATON 240463.

• Thread fit: Confirm the correct 15-415 finish.
• Rim condition: Check for chips, defects, contamination, or residue.
• Liner condition: Check the PTFE surface, backing, and placement.
• Application: Use an approved tightening and handling method.
• Qualification: Test for leakage, evaporation, or sample loss as required by the application.

The manufacturer identifies WHEATON 240463 as autoclavable. DWK's technical guide also identifies its PTFE/14B rubber liner construction as autoclavable.

That designation does not establish an approved cycle for every filled, tightly capped, or chemically sensitive container assembly. The complete configuration must be qualified for the intended processing conditions.

WHEATON 240463 is a solid-top cap. It is not an open-top closure designed to expose a pierceable septum.

Although the liner contains rubber, the cap's closed top does not provide a designated syringe-access opening. Repeated needle puncture, self-sealing performance, and autosampler compatibility are not established for this product.

For applications requiring sample withdrawal through a septum, select a separately qualified open-top closure and compatible septum system.

DWK's general PTFE/14B liner description references FDA 21 CFR 177.1550 for the PTFE material. The same guide describes the 14B backing as white sulfur-cured styrene-butadiene rubber.

These statements describe manufacturer material information. They do not independently certify the finished WHEATON 240463 closure for a particular pharmaceutical, food-contact, medical-device, or sterile application.

Contact SOSCleanroom for additional manufacturer documentation when the intended application has regulated material or quality-system requirements.

The presence of a PTFE-faced liner does not automatically qualify a closure for sterile manufacturing or a defined ISO cleanroom classification.

The reviewed 240463 records do not establish supplied sterility, a particulate release specification, an endotoxin limit, or a product-specific extractables and leachables qualification. Facilities should apply their own material acceptance and contamination-control criteria.

• Verify SKU: Confirm WHEATON 240463.
• Check thread finish: Confirm 15-415, not 15-425 or 13-425.
• Confirm quantity: Verify 200 caps per case.
• Inspect phenolic cap: Check for cracks, visible defects, and damaged threads.
• Inspect liner: Confirm PTFE/14B rubber material and correct liner seating.
• Inspect facing: Look for contamination, separation, or damage.
• Verify container: Confirm a compatible 15-415 neck and appropriate sealing rim.
• Review processing: Follow the approved cap and container preparation procedure.
• Maintain traceability: Apply the laboratory's material identification and acceptance requirements.

The DWK Closure Liner Guide provides general technical information about liner materials, PTFE-facing construction, thread-finish identification, and selecting liners for laboratory containers.

Documentation boundary: General manufacturer material information does not constitute a finished-product sterility certificate, leakproof guarantee, or universal chemical compatibility certification. Contact SOSCleanroom to request additional available documentation if required.

SOSCleanroom can help verify 15-415 container compatibility, select PTFE-faced closures, compare 13-425 and 15-425 alternatives, and obtain manufacturer technical documentation.