{"product_id":"globe-scientific-vial-9050000cap-sm-rw","title":"20mL Headspace Vial Screw Caps, Steel\/Magnetic 18mm Finish, PTFE\/Silicone Septa — 2 Colors, 100\/Pack | Globe Scientific","description":"\u003ch2\u003eDiamondPure Steel\/Magnetic Screw Cap for 20mL Headspace Vials, 18mm Finish, 1.3mm PTFE\/Silicone Septa, 100\/Pack\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGlobe Scientific DiamondPure Steel\/Magnetic Screw Cap for 20mL Headspace Vials\u003c\/strong\u003e delivers a secure, CTC-compatible seal for automated headspace GC workflows. Engineered with an 18mm finish and a bonded PTFE\/silicone septum, these caps suit residual solvent analysis, volatile organic compound (VOC) screening, and forensic toxicology sampling where reliable sealing prevents analyte loss.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSteel\/Magnetic Screw Cap, 18mm Finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\/Size\u003c\/td\u003e\n\u003ctd\u003eFor 20mL headspace vials, 18mm finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSteel\/magnetic cap body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\/Cap\u003c\/td\u003e\n\u003ctd\u003eMagnetic screw cap; 1.3mm bonded PTFE\/silicone septum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGraduation\u003c\/td\u003e\n\u003ctd\u003eNot applicable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e100 caps\/pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eAvailable Colors\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed — Red PTFE\/White Silicone — Bag of 100\u003c\/td\u003e\n\u003ctd\u003e9050000CAP-SM-RW\u003c\/td\u003e\n\u003ctd\u003e$102.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWhite — White PTFE\/Blue Silicone — Bag of 100\u003c\/td\u003e\n\u003ctd\u003e9050000CAP-SM-WB\u003c\/td\u003e\n\u003ctd\u003e$108.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStatic headspace GC analysis of volatile organic compounds\u003c\/li\u003e\n\u003cli\u003eUSP \u0026lt;467\u0026gt; residual solvent testing in pharmaceutical QC\u003c\/li\u003e\n\u003cli\u003eBlood alcohol and forensic toxicology headspace sampling\u003c\/li\u003e\n\u003cli\u003eEnvironmental screening of trace volatiles in water and soil extracts\u003c\/li\u003e\n\u003cli\u003eAutomated sampling on CTC\/PAL magnetic transport autosamplers\u003c\/li\u003e\n\u003cli\u003eFood and beverage flavor and off-odor volatile profiling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eChemical Resistance\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eAqueous buffers\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids\u003c\/td\u003e\n\u003ctd\u003eExcellent (PTFE-facing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute bases\u003c\/td\u003e\n\u003ctd\u003eExcellent (PTFE-facing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlcohols\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents\u003c\/td\u003e\n\u003ctd\u003eGood (limit septum contact time)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents\u003c\/td\u003e\n\u003ctd\u003eGood (limit septum contact time)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003ePurchase through labsupplies.com, an authorized Globe Scientific dealer shipping from US inventory. Each pack carries a lot number, supporting traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available — contact our procurement team for volume quotes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eAre these caps compatible with CTC\/PAL autosampler systems?\u003c\/h3\u003e\n\u003cp\u003eYes. The magnetic steel cap body is designed for CTC-compatible magnetic transport heads, enabling reliable pickup and placement on automated headspace platforms.\u003c\/p\u003e\n\u003ch3\u003eWhich septum orientation faces the sample?\u003c\/h3\u003e\n\u003cp\u003eThe PTFE layer faces the sample to provide chemical inertness, while the silicone layer offers resealing and puncture resilience after needle penetration.\u003c\/p\u003e\n\u003ch3\u003eWhat vial finish do these caps fit?\u003c\/h3\u003e\n\u003cp\u003eThey are sized for the 18mm finish standard on 20mL headspace vials commonly used in static headspace GC analysis.\u003c\/p\u003e\n\u003ch3\u003eWhat is the difference between the red and white versions?\u003c\/h3\u003e\n\u003cp\u003eBoth share the steel\/magnetic body and 1.3mm septum. The red cap uses a red PTFE\/white silicone septum; the white cap uses a white PTFE\/blue silicone septum for color-coded sample tracking.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"DiamondPure Steel\/Magnetic Screw Cap for 20mL Headspace Vial, 18mm Finish\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Globe Scientific\"},\n  \"description\": \"Steel\/magnetic screw caps for 20mL headspace vials, 18mm finish, 1.3mm PTFE\/silicone septa, CTC-compatible. 100\/pack.\",\n  \"offers\": {\n    \"@type\": \"AggregateOffer\",\n    \"priceCurrency\": \"USD\",\n    \"lowPrice\": \"102.00\",\n    \"highPrice\": \"108.00\",\n    \"offerCount\": \"2\",\n    \"offers\": [\n      {\"@type\": \"Offer\", \"sku\": \"9050000CAP-SM-RW\", \"price\": \"102.00\", \"priceCurrency\": \"USD\"},\n      {\"@type\": \"Offer\", \"sku\": \"9050000CAP-SM-WB\", \"price\": \"108.00\", \"priceCurrency\": \"USD\"}\n    ]\n  }\n}\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\": \"Question\", \"name\": \"Are these caps compatible with CTC\/PAL autosampler systems?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The magnetic steel cap body is designed for CTC-compatible magnetic transport heads, enabling reliable pickup and placement on automated headspace platforms.\"}},\n    {\"@type\": \"Question\", \"name\": \"Which septum orientation faces the sample?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The PTFE layer faces the sample to provide chemical inertness, while the silicone layer offers resealing and puncture resilience after needle penetration.\"}},\n    {\"@type\": \"Question\", \"name\": \"What vial finish do these caps fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"They are sized for the 18mm finish standard on 20mL headspace vials commonly used in static headspace GC analysis.\"}},\n    {\"@type\": \"Question\", \"name\": \"What is the difference between the red and white versions?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Both share the steel\/magnetic body and 1.3mm septum. The red cap uses a red PTFE\/white silicone septum; the white cap uses a white PTFE\/blue silicone septum for color-coded sample tracking.\"}}\n  ]\n}\n\u003c\/script\u003e","brand":"Globe Scientific","offers":[{"title":"Red — Red PTFE\/White Silicone — Bag of 100","offer_id":48607937888488,"sku":"9050000CAP-SM-RW","price":102.0,"currency_code":"USD","in_stock":true},{"title":"White — White PTFE\/Blue Silicone — Bag of 100","offer_id":48607937921256,"sku":"9050000CAP-SM-WB","price":108.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/file_aaf22e6f-3ced-41a8-8882-84dc4bde96ca.jpg?v=1769359557","url":"https:\/\/labsupplies.com\/products\/globe-scientific-vial-9050000cap-sm-rw","provider":"LabSupplies.com","version":"1.0","type":"link"}