This definition appears very rarely
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Samples in periodicals archive:
Rigid Porous Polyethylene Samplers (RPP) PRICE, each; rpp sampler (6" length, 1.5" diameter, 100 ml) $65.00
3 Rigid Porous Polyethylene (RPP) Samplers In protective mesh ready for deployment & packaged in disposable water-filled sleeve for shipping For Inorganics
Rigid porous polyethylene samplers (RPPSs) are diffusion based samplers developed to sample for a broader range of analytes than can be collected by the PDB sampler...