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https://www.cd-bioparticles.com/product/diagpoly-polyethylene-particles-50-100-nm-item-dfc-l019b-pe-50-15467.html

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DiagPoly™ Polyethylene Particles, 50-100 nm, PDI < 0.2, supplied 1 mL at 1% solid in aqueous media (0.1% Tween 20 in DI waterwith 2mM NaN3).