PEG Smear Low contains equal volumes of 50% v/v (or w/v where appropriate) stock PEG solutions mixed to produce the final smear. The Low Molecular Weight (LMW) Smear contains PEG 400, PEG 550 MME, PEG 600 and PEG 1000. Available in 100 mL or 250 mL volumes. Select the volume you require from the drop-down menu.MD2-100-258 for 100 mLorMD2-250-258 for 250 mL

Reference

Chaikuad, A, Knapp, S and von Delft, K (2015). Defined PEG smears as an alternative approach to enhance the search for crystallization conditions and crystal-quality improvement in reduced screens. Acta Crystallographica F71: 1627-1639.

Abstract  Quantum chemistry method was used to calculate the geometry structure of heavy oil character molecule. The method to calculate the minimum cross-sectional diameter of heavy oil character molecule and to show the molecular dimension was brought forward, which was used to predict the minimum cross-sectional diameter of some typical heavy oil character molecules. It is shown that the theory calculated result was consistent with experimental date. The minimum cross-sectional diameters of Daqing first cut (DQ-fcut) , middle cut (DQ-mcut) and end cut (DQ-endcut) were 1.8703, 3.0080 and 3.4929nm, respectively, meaning that these kinds of heavy oil molecules are too big to enter the sieve pore of zeolites, so they could be only cracked on the surface of zeolite. These research results can offer some useful theory basis to the selection and synthesis of zeolites.