{"product_id":"pp-microspheres-polypropylene-microplastic-reference-standard-polyref™","title":"PP Microspheres – Polypropylene Microplastic Reference Standard | PolyRef™","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePolyRef™ PP Microspheres\u003c\/strong\u003e are research-grade Polypropylene microspheres manufactured by RIGOR Science from commercial PP feedstock. True-spherical submicron PP particles fill a long-standing gap in microplastic reference materials — most commercial PP particles are mechanically ground fragments or limited to micron-scale ranges.\u003c\/p\u003e\n\u003cp\u003eEach batch retains the characteristic chemical structure of PP, with strong FTIR methyl bands at 1376 and 1458 cm⁻¹ — the diagnostic signature that distinguishes PP from polyethylene in mixed microplastic spectral analysis. Particles are verified by FT-IR, SEM, and DLS, and are clean-surfaced, fully spherical, and free from debris.\u003c\/p\u003e\n\u003ch3\u003eWhy PP?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe world's second-largest plastic by production.\u003c\/strong\u003e ~20–25% of global plastic output. Packaging films, medical devices (syringes, petri dishes, IV bags), automotive interiors, ropes\/fishing nets, and nonwoven fabrics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe \"mask microplastic\" of the post-pandemic era.\u003c\/strong\u003e Disposable masks, surgical gowns, and wipes are predominantly PP nonwoven — making PP one of the most rapidly emerging microplastic pollutants in indoor air, wastewater, and surface water since 2020.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLowest-density common microplastic (0.90 g\/cm³).\u003c\/strong\u003e Floats more buoyantly than LDPE — ideal for sea-surface microplastic transport, neuston-layer studies, and surface skim sampling simulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostic FTIR signature.\u003c\/strong\u003e Strong methyl bands at 1376 and 1458 cm⁻¹ (one CH₃ per monomer) unambiguously distinguish PP from PE in mixed-polymer spectral identification — a frequent challenge in environmental sample analysis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard model for UV photo-oxidative aging.\u003c\/strong\u003e PP's tertiary C–H bond is the most susceptible to photo-oxidation among common plastics. PP microspheres are widely used as model systems for plastic weathering, carbonyl-index measurement, and aged-microplastic toxicology research.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubmicron true-spherical PP is rare commercially.\u003c\/strong\u003e Most \"PP microparticles\" from suppliers like Cospheric are micron-scale only; submicron PP at controlled morphology is essentially absent from the commercial market.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%;\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (PP) — isotactic, from commercial feedstock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCAS No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9003-07-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChemical Formula\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e(C₃H₆)ₙ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParticle Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~300 nm、~500nm (other sizes available on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMorphology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTrue spherical, clean surface, free of aggregates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDensity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~0.90 g\/cm³ (floats in water — most buoyant common microplastic; vortex before use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCrystallinity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSemi-crystalline (~50–60%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDispersion\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAqueous suspension with 0.01% SDS as stabilizer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConcentration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 mg\/mL or 10 mg\/mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 mL (custom volumes on request)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2–8 °C, protect from light; do not freeze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShelf Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e36 months at 4 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharacterization\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFT-IR, SEM, DLS; batch-specific COA included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMicroplastic identification by FTIR \/ Raman \/ Py-GC-MS\u003c\/li\u003e\n\u003cli\u003eSea-surface and neuston-layer microplastic transport studies\u003c\/li\u003e\n\u003cli\u003eMask, nonwoven, and medical-device microplastic source attribution\u003c\/li\u003e\n\u003cli\u003eIndoor air and ventilation microplastic monitoring standards\u003c\/li\u003e\n\u003cli\u003eUV photo-oxidation and weathering studies (PP is the standard aging model)\u003c\/li\u003e\n\u003cli\u003eCarbonyl-index method development for plastic degradation\u003c\/li\u003e\n\u003cli\u003eFood packaging migration and contact-material microplastic studies\u003c\/li\u003e\n\u003cli\u003eEcotoxicology — aquatic organism exposure, soil microbiota\u003c\/li\u003e\n\u003cli\u003eSpectral library construction and FTIR reference for differentiating PP from PE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot Recommended For\u003c\/h3\u003e\n\u003cp\u003eDirect cell toxicity assays without prior dialysis to remove SDS surfactant. For surfactant-free or custom-stabilized versions, please contact us.\u003c\/p\u003e\n\u003ch3\u003eQuality Documentation\u003c\/h3\u003e\n\u003cp\u003eEach shipment includes a batch-specific Certificate of Analysis (COA) with SEM images,\u003c\/p\u003e\n\u003cp\u003eFTIR spectrum (highlighting the 1376\/1458 cm⁻¹ methyl bands), and DLS size distribution. Raw-material FTIR reference spectra available on request for batch verification.\u003c\/p\u003e\n\u003cp\u003eSub-micron grades (100–200 nm) are characterized by DLS; micron grades (≥1 μm) are characterized by laser diffraction \/ optical microscopy. Representative data shown; see COA for lot-specific values.\u003c\/p\u003e","brand":"RIGOR Science","offers":[{"title":"300nm-5 mg\/mL × 10 mL","offer_id":47648694272163,"sku":null,"price":139.0,"currency_code":"USD","in_stock":true},{"title":"300nm-10 mg\/mL × 10 mL","offer_id":47648694304931,"sku":null,"price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/0854\/7747\/files\/4_m002.jpg?v=1778562974","url":"https:\/\/rigorsci.com\/products\/pp-microspheres-polypropylene-microplastic-reference-standard-polyref%e2%84%a2","provider":"RIGOR science","version":"1.0","type":"link"}