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https://www.cd-bioparticles.com/p/DiagPoly%E2%84%A2-Carboxyl-Polystyrene-Particles-0-2-%C2%B5m_258_266_284_4212.html

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DiagPoly™ Carboxyl Polystyrene Particles, 0.2 μm

Carboxyl PS Particles, 0.2 μm, 50 mg/mL, dispersed in DI water, analytical standard.