22-400 Open Top PP Screw Cap With Septa

ALWSCI is one of the leading China 22-400 open top cap with septa manufacturers and suppliers, welcome to wholesale cheap 22-400 open top cap with septa, HPLC consumables from us.

Product Name ALWSCI® 22-400 Open Top PP Screw Cap With Septa
Cap Material PP
Cap Size 22mm
Cap Colors White
Septa PTFE/Silicone; Grey PTFE/Butyl
Septa Thick 2/ 3 mm
Package 100 pcs Packed in one Bag
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    1) Description

    22-400 Open Top PP Screw Cap with Septa is a high quality cap solution designed for precision packaging in laboratory and industrial areas. The cap is made from durable polypropylene (PP) material and comes with a pre-installed septa to fit bottles up to 24mm in diameter. Its open-top design allows users to easily add or extract samples, while a screw-type fastening mechanism ensures the bottle is airtight and secure.

    2) Application

    22-400 Open Top PP Screw Cap with Septa is widely used in chemistry, biological science, environmental monitoring, drug development and other fields, especially suitable for those occasions where frequent sampling or reagent addition is required. Its design allows for fast and accurate sample transfer using automated sample handling equipment and is ideal for laboratory analysis, sample storage and sealing needs during transportation. In addition, the product is ideal for gas chromatography (GC) and liquid chromatography (LC) analyses, as it effectively prevents sample evaporation and cross-contamination.

    CAT.NO Cap Color Description Package
    C0000562 White 22-400 Open Top PP Screw Cap with Natural PTFE/White Silicone Septa 2mm Thick. 100 pcs/pk.
    C0001031 White 22-400 Open Top PP Screw Cap with Grey PTFE/Butyl Septa 3mm Thick. 100 pcs/pk.
    C0001301 White 22-400 Open Top PP Screw Cap. 100 pcs/pk.

     

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    4) Sorbent Selection Guide by Target Compound Type

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    Non-polar compounds (e.g., pesticides, PAHs, steroids) C18, C8 Hydrophobic interaction Water, serum, urine, plant extracts C18 offers stronger retention than C8; ideal for reversed-phase cleanup
    Moderately polar compounds (e.g., phenols, mycotoxins) C18, Polymeric RP (e.g., PS-DVB) Hydrophobic + π-π interaction Food, biological fluids Polymeric sorbents are more water-wettable, suitable for polar solvents
    Highly polar compounds (e.g., organic acids, catechols) HLB, NH₂, Diol Hydrogen bonding, dipole-dipole Urine, environmental water HLB retains a broad range; NH₂ useful for weak anion exch. or polar groups
    Weak acids (e.g., carboxylic acids, ibuprofen) SAX, NH₂ Anion exchange Plasma, pharmaceutical SAX strongly retains acidic groups; pH optimization required
    Weak bases (e.g., amines, alkaloids, β-blockers) SCX, CM, Cation-Exchange HLB Cation exchange Plant extract, drugs in serum SCX retains positively charged species; elution with NH₄OH or MeOH
    Neutral small molecules (e.g., caffeine, parabens) C18, Polymeric RP Hydrophobic Beverage, urine, cosmetics Use mild elution to avoid co-extracting matrix
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    Peptides / proteins (cleanup purpose) C18 (for peptide), GCB (for protein removal) Size exclusion / interaction Serum, plasma Use protein precipitation prior to SPE for better recovery
    Hormones & endocrine disruptors (e.g., estradiol, BPA) HLB, C18, CN Hydrophobic, mixed-mode Environmental water, cosmetics HLB provides broader range capture for trace organics
    Pesticides (polar & non-polar) C18, GCB/PSA combo, QuEChERS + SPE Multi-mode Fruit/vegetables, grains Use multi-layer or tandem SPE for complex matrix cleanup
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