{"product_id":"ldpe-microspheres-low-density-polyethylene-microplastic-reference-standard-polyref™","title":"LDPE Microspheres – Low-Density Polyethylene Microplastic Reference Standard | PolyRef™","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePolyRef™ LDPE Microspheres\u003c\/strong\u003e are research-grade Low-Density Polyethylene microspheres manufactured by RIGOR Science using proprietary synthesis routes from high-purity commercial LDPE feedstock. Submicron, true-spherical LDPE particles have long been a gap in commercial supply — LDPE's high branching and low melting point make spherical morphology far harder to achieve than for PS, PMMA, or other common polymers.\u003c\/p\u003e\n\u003cp\u003eEach batch retains the characteristic chemical structure of LDPE (FTIR branched methyl peak at ~1378 cm⁻¹) and is verified by FT-IR, SEM, and DLS. Particles are clean-surfaced, fully spherical, and free from debris or aggregation.\u003c\/p\u003e\n\u003ch3\u003eWhy LDPE?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDominant marine microplastic type.\u003c\/strong\u003e LDPE accounts for ~30–40% of surface marine microplastic pollution — packaging films, agricultural mulch, single-use bags.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubmicron supply is scarce.\u003c\/strong\u003e While HDPE microspheres are commercially available (e.g., Cospheric), submicron true-spherical LDPE microspheres remain rare globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCloser to real environmental microplastics.\u003c\/strong\u003e LDPE's branched structure and lower crystallinity better mimic weathered marine microplastics than HDPE.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreferred for UV-aging studies.\u003c\/strong\u003e LDPE undergoes photo-oxidative degradation more readily than HDPE — the standard model for plastic environmental aging research.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCAS No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9002-88-4\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(C₂H₄)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~200 nm and ~500 nm (custom sizes available)\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\u003ePDI (DLS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~0.16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDensity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.92–0.94 g\/cm³ (floats in water; vortex before use)\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 0.1% 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\u003e12 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 and FTIR\/Raman method development\u003c\/li\u003e\n\u003cli\u003eSolid-phase adsorption and partition studies\u003c\/li\u003e\n\u003cli\u003eFiltration membrane performance evaluation\u003c\/li\u003e\n\u003cli\u003eMarine microplastic simulation\u003c\/li\u003e\n\u003cli\u003eUV \/ photo-aging and weathering studies\u003c\/li\u003e\n\u003cli\u003eEnvironmental fate and transport research\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, FTIR spectrum, 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":"200nm → 5 mg\/mL","offer_id":47645824843939,"sku":null,"price":149.0,"currency_code":"USD","in_stock":true},{"title":"200nm → 10 mg\/mL","offer_id":47645824876707,"sku":null,"price":229.0,"currency_code":"USD","in_stock":true},{"title":"500nm → 10 mg\/mL","offer_id":47645824909475,"sku":null,"price":129.0,"currency_code":"USD","in_stock":true},{"title":"500nm → 5 mg\/mL","offer_id":47645824942243,"sku":null,"price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/0854\/7747\/files\/2_m003.jpg?v=1778489499","url":"https:\/\/rigorsci.com\/products\/ldpe-microspheres-low-density-polyethylene-microplastic-reference-standard-polyref%e2%84%a2","provider":"RIGOR science","version":"1.0","type":"link"}