Density grades

High-density polyethylene (p = 0.94-0.96 g/cm ) has up to five times the stiffness of low-density polyethylene at ambient temperatures and can be used at much higher temperatures. Its chemical resistance is similar to that of the low-density grades, but the resistance to swelling by solvents is higher. 

A polypropylene pipe with an outside diameter of 80 mm is required to withstand a constant pressure of 0.5 MN/m for at least 3 years. If the density of the material is 909 kg/m and the maximum allowable strain is 1.5% estimate a suitable value for the wall thickness of the pipe. If a lower density grade of polypropylene (p = 905 kg/m ) was used under the same design conditions, would there be any weight saving per unit length of pipe ... 

Polyethylene, various densities Good/Excellent High-density grades not as stable... 

Polyamides (nylon) Good as medium- or low-density grades. Nylons 10,11,12,6-6 are more stable... 

We use single site catalysts primarily to make copolymers of ethylene and 1-alkenes, with densities ranging from approximately 0.87 to 0.93 g/cm3. More recently some higher density grades have been introduced, but these are relatively uncommon at the moment. 

Very low density polyethylenes are relatively soft and transparent, because they are largely noncrystalline in nature. Films made from these materials are resilient with a moderate level of elastic recovery, as long as they are not stretched beyond strain levels of approximately 100%. At their lower densities, they feel tacky and tend to stick to each other. We often blend very-low density polyethylene into higher density grades of polyethylene or isotactic polypropylene to boost their impact resistance. 

Sodium Tripolyphosphate (Light Density grade 067) Metso 2048, Sodium Metasiiicate Anhydrous Avanel S-74... 

Sodium Tripoly Phosphate (Light Density Grade 067) 20.0... 

Improved Regeneration Quality with Length and Density Grading... 

LDG, which stands for LENGTH AND DENSITY GRADING, is a new development in the management of spent catalysts. The objective of this new technology developed by Catalyst Recovery, Inc. is to pick out reusable catalyst particles from undesirable catalyst particles. The ability to efficiently segregate individual catalyst particles... 

Density grading is a technique by which catalyst particles are segregated based on their individual densities. This process is most often performed following length grading since the... 

Density grading is flexible in that it can be applied to any size or shape catalyst particle. The number of fractions produced... 

In addition, density grading has been shown to be very effective in separation of catalyst mixtures to enhance regeneration quality and possibility. 

Table 5. Density grading 1/16 Inch Cobalt/Moly (1.6mm)...

INTEX SOFTENER 215 produces the slick hand generally associated with the high density grade polyethylenes. It has been found to produce on excellent hand on many fabric blends, particularly those containing substantial percentage of cellulosic fibers. 

Several different grades of microcrystalline cellulose are commercially available that differ in their method of manu-facture, " particle size, moisture, flow, and other physical properties. The larger-particle-size grades generally provide better flow properties in pharmaceutical machinery. Low-moisture grades are used with moisture-sensitive materials. Higher-density grades have improved flowability. 

Use Wire and cable coatings and insulation (low-density grades), pipe and molded fittings (high-den-sity grades). Special types having low electrical resistivity can be made these can be regarded as semiconductors. 

NOVA Chemicals (International) S.A. Polyethylene Ethylene and comonomer SCLAIRTECH technology process produces the full range of linear polyethylene (PE) products, including linear-low-density, medium-density and high-density grades with narrow to broad molecular weight distribution 12 2010... 

Research has shown that ripeness is important to the quality of juices and wines made from muscadines. Lanier and Morris ( ) separated muscadine grapes into five density grades using four brine solutions and reported that the flavor quality of juice from muscadines sorted into ripeness levels by the density flotation method increased with the ripeness or soluble solids. Carroll (20) reported that the quality or acceptability of wine made from grapes separated into ripeness levels by light sorting increased to a point and then dropped off as the grapes became overripe. 

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