The 38-430 thread finish is a widely used standard for plastic bottles in laboratories and industrial applications. Commonly found on containers like Nalgene bottles, this thread design is recognized for its durability and compatibility with a variety of caps and closures.

Unlike glass threads, the 38-430 thread on plastic bottles often incorporates additional height and structure, making it incompatible with most GL38 caps. This thread finish is especially valued in laboratory settings, where plastic bottles are frequently used for storing reagents, buffers, and other solutions.

Lightweight, shatterproof, and resistant to a range of chemicals, 38-430 threaded plastic bottles are a practical choice for environments requiring portability and durability.

All Lab Lids safety caps for solvent extraction include ported inserts—threaded ports designed for secure tubing connections.

For integrated evaporation control, choose caps with built-in check valves that regulate airflow in a single direction. These valves allow air into the bottle to prevent vacuum buildup while solvents are pumped to the instrument.

Check valves are available in three material options based on chemical compatibility needs. Each seal material is color-coded by the particulate filter at the center of the cap:

• FFKM for nearly universal compatibility (yellow filter color)

• FKM (green filter) and EPDM (blue filter) for cost-effective alternatives with a narrower compatibility range.