{"product_id":"214-2346-08n-round-bottom-ppc","title":"19 mL Test Tubes, Round Bottom, PPC, Natural — 214-2346-08N | 125\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e19 mL Round-Bottom Test Tubes — PPC, Natural, 16 × 125 mm (214-2346-08N) | 125\/Bag\u003c\/h2\u003e\n\u003cp\u003eThese 19 mL polypropylene copolymer (PPC) round-bottom test tubes measure 16 × 125 mm and are packaged 125\/Bag for evaluation batches, specialty workflows, or small standing-stock needs. PPC is a modified polypropylene resin that delivers greater optical clarity and improved low-temperature flexibility compared with standard homopolymer PP, making these tubes the preferred choice when visual inspection of tube contents is a routine part of the workflow. Supplied non-sterile, they suit a broad range of clinical, research, and bench chemistry applications.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e214-2346-08N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e19 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e16 × 125 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGeometry\u003c\/td\u003e\n\u003ctd\u003eRound Bottom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolypropylene Copolymer (PPC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eNatural\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\u003e125\/Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalate \/ Latex\u003c\/td\u003e\n\u003ctd\u003eBPA-Free, Phthalate-Free, Latex-Free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOptical inspection workflows — meniscus reading, turbidity assessment, and color-change endpoint monitoring benefit directly from PPC's superior wall clarity versus homopolymer PP\u003c\/li\u003e\n\u003cli\u003eTitration and manual endpoint detection — the clearer tube wall allows direct visual confirmation of color transitions without transferring the sample\u003c\/li\u003e\n\u003cli\u003eCold-temperature protocols — refrigerator and −20 °C rack storage where PPC's improved low-temperature flexibility reduces the brittleness risk associated with homopolymer PP\u003c\/li\u003e\n\u003cli\u003eOrganic solvent reactions — bench chemistry involving acetonitrile, methanol, or similar co-solvents, where PPC retains the broad solvent compatibility of the PP family\u003c\/li\u003e\n\u003cli\u003eWater-bath incubation — compatible with water-bath use up to approximately 80 °C in standard 16 × 125 mm racks\u003c\/li\u003e\n\u003cli\u003eCentrifugation — suitable for clinical centrifuge protocols in 16 × 125 mm rotor formats\u003c\/li\u003e\n\u003cli\u003eEvaluation and small-batch specialty use — the 125\/Bag format is ideal for labs trialing PPC before committing to larger volumes or maintaining a small parallel stock alongside PP or PS tube inventories\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eChemical Resistance\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eReagent \/ Condition\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAqueous buffers and saline\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids and bases\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile \/ methanol\u003c\/td\u003e\n\u003ctd\u003eGood — consistent with PP-family solvent compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthanol (\u0026lt;70%)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (e.g., chloroform)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (e.g., toluene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave sterilization\u003c\/td\u003e\n\u003ctd\u003eCompatible with PP-class thermal ratings; confirm protocol requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003eMade in USA, these Caplugs® Evergreen tubes are produced from FDA-compliant, BPA-free, phthalate-free, latex-free PPC resin under ISO 9001 quality management. The copolymer architecture is engineered for tighter dimensional tolerances and consistent wall clarity across the production run. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, typically the same business day for stocking items; volume pricing is available for multi-bag and institutional orders.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is PPC, and why choose it over standard polypropylene (PP) tubes?\u003c\/strong\u003e\u003cbr\u003ePPC (polypropylene copolymer) incorporates a co-monomer into the PP chain during polymerization, which disrupts the crystalline structure of homopolymer PP. The result is a resin that is more optically transparent, more flexible at low temperatures, and easier to process to tight dimensional tolerances — while retaining PP's broad compatibility with aqueous buffers, dilute acids and bases, and many organic solvents such as acetonitrile and methanol.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these test tubes sterile?\u003c\/strong\u003e\u003cbr\u003eNo — they are supplied non-sterile in 125\/Bag packaging. For applications requiring a sterile vessel, additional processing such as gamma irradiation or autoclave treatment may be performed; consult your facility's validation protocols before use in sterility-critical workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill these tubes fit standard 16 × 125 mm tube racks and clinical centrifuge rotors?\u003c\/strong\u003e\u003cbr\u003eYes. At 16 mm outer diameter and 125 mm length, these tubes are dimensionally equivalent to the standard 16 × 125 mm format accepted by common tube racks and clinical centrifuge rotor positions designed for that size. Always confirm rotor and rack specifications before centrifuging.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is the pack size 125\/Bag rather than the 1000\/Bag available for PP and PS equivalents?\u003c\/strong\u003e\u003cbr\u003eThe 125\/Bag format is designed as the evaluation and specialty-use entry point, allowing labs to test PPC performance in their specific workflows before committing to bulk quantities, or to maintain a small standing stock of PPC tubes alongside a primary PP or PS tube inventory.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"19 mL Round-Bottom Test Tubes, PPC, Natural, 16 × 125 mm — 125\/Bag\",\"sku\":\"214234608NE1\",\"mpn\":\"214-2346-08N\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene Copolymer (PPC)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"20.77\",\"availability\":\"https:\/\/schema.org\/InStock\"}}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is PPC, and why choose it over standard polypropylene (PP) tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"PPC (polypropylene copolymer) incorporates a co-monomer into the PP chain during polymerization, which disrupts the crystalline structure of homopolymer PP. 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