DWK 240208 WHEATON Black Phenolic Screw Cap, Rubber Liner, 13-425

WHEATON® 240208 is a 13-425 black phenolic screw cap with a solid top and an integrated white 14B styrene-butadiene rubber liner. It is designed as a laboratory closure for appropriately matched containers.

Three factors should guide selection: the 13-425 thread finish, the phenolic cap body, and the rubber sealing interface. Each contributes to compatibility and performance of the final container assembly.

The manufacturer does not list a product-specific outer cap diameter, cap height, application-torque range, liner thickness, or universal leak-rate specification in the reviewed 240208 records.

The 13-425 designation identifies the closure's nominal screw-thread finish. It is used to match caps to containers with a corresponding compatible neck.

Thread-finish selection must consider both the nominal diameter designation and the thread configuration. A closure bearing a different designation, such as 13-415, should not be assumed interchangeable.

Even when the thread finish matches, proper liner compression and sealing performance depend on the container rim, thread engagement, tightening conditions, and component tolerances.

DWK's technical liner guide identifies 14B as a white, homogeneous, sulfur-cured styrene-butadiene rubber (SBR). The manufacturer states that it is not natural rubber.

According to the manufacturer, the material has good resilience and moisture-vapor resistance and is suitable for many moderate chemical exposures.

WHEATON identifies its rubber-lined screw caps as useful in certain cell culture applications. This manufacturer application description should not be treated as a product-specific biocompatibility certificate or supplied-sterility claim.

The liner is one of the most important selection factors for this closure. DWK describes 14B rubber as acceptable for many moderate chemical exposures, while identifying limitations with certain materials.

Chemical compatibility depends on the specific substance, concentration, temperature, exposure duration, and contact conditions. General rubber-resistance statements do not establish sample stability or sealing performance for an assembled vial.

WHEATON offers multiple 13-425 laboratory closure configurations. The primary difference may be the liner material rather than the cap's external appearance.

The PTFE-faced versions provide a different sample-contact surface and may be appropriate for applications requiring greater chemical resistance. The alternative liner must still be tested for the intended formulation and container combination.

SKU 240208 features a solid-top cap. The cap is not designed as an open-top access closure.

Open-top caps and septum closures are separately cataloged products intended for workflows requiring needle access to the contents.

The presence of rubber beneath a solid cap does not establish that the liner can be pierced with a syringe or will reseal after puncture. Select the appropriate closure style for the method.

A screw cap's performance depends on how the liner contacts the container mouth. The finished seal is affected by the cap, rim geometry, thread engagement, application torque, liner condition, and intended storage environment.

DWK recommends testing a selected liner before use in leak-resistant applications. The reviewed 240208 specifications do not publish a universal leakproof designation or application-torque value.

• Inspect the rim: Check for damage or material that could interrupt the liner interface.
• Inspect the liner: Confirm correct seating and no visible deterioration.
• Match the thread: Confirm the intended 13-425 closure fit.
• Control tightening: Use the approved procedure for the selected container.
• Verify containment: Test under actual filling, storage, and handling conditions when required.

DWK lists WHEATON 240208 as autoclavable. Its technical liner guide also describes 14B styrene-butadiene rubber as autoclavable.

This manufacturer designation does not establish a product-specific validated cycle for every container, closure condition, filled sample, or repeated processing sequence.

The complete assembly should be evaluated for any heat-related changes in liner condition, closure integrity, or subsequent sealing performance.

DWK describes its white 14B rubber-lined phenolic caps as suitable for certain cell culture work. Application compatibility should still be evaluated using the actual container, sample, and process.

The reviewed 240208 record does not provide a product-specific cell-culture validation report, endotoxin limit, particle-release specification, or ISO cleanroom classification.

Where a facility requires sterile, low-bioburden, low-extractables, or controlled particle performance, request appropriate technical documentation and qualify the final closure assembly before use.

• Verify identification: Confirm WHEATON 240208 and the 13-425 thread finish.
• Check quantity: Confirm 200 caps per case.
• Inspect cap condition: Check for cracked phenolic material or damaged screw threads.
• Verify liner: Confirm the white rubber liner is present and appropriately seated.
• Confirm liner specification: Ensure plain 14B rubber is the approved material, not a PTFE-faced substitute.
• Verify container fit: Confirm that the intended vial or bottle accepts the selected closure.
• Assess processing: Follow qualified cleaning, autoclaving, and sealing requirements.
• Document acceptance: Apply the facility's material traceability and inspection procedures.

The following DWK resource is a technical information guide, not a manufacturer product-ordering page.

Documentation limitation: General material data do not constitute a finished-cap leakproof certificate, product-specific sterility certificate, or universal chemical compatibility approval. Request additional documentation through SOSCleanroom when needed.

SOSCleanroom can help identify 13-425 compatible sample containers, replacement caps, alternate liner configurations, and supporting manufacturer specifications.