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neerajsinghvns : properties   11

Crystalline vs. Amorphous PET;;;
All PET materials are hygroscopic, so exposure to a humid environment will cause them to absorb moisture. This moisture causes a cleavage in the polymer chain during melt and results in a degradation of the physical properties of the product produced.

Virgin PET
Virgin PET is usually in a crystalline state (indicated by its white color) when it is purchased from a supplier.
Reground PET
Regrind PET material is usually not crystalline, but amorphous and clear in color.
Agitating the material while heating it to a temperature of about 180˚ F will convert the material from its amorphous state to a crystallized state, ready for drying. We call this process crystallizing but technically, it is a re-crystallization of the material.
states  state  properties  plastics  plastic  crystalline  amorphous  PET 
april 2013 by neerajsinghvns
tags: property properties sectional dimensional square box structures metal hollow of torsion torsional stiffness stiff;;;
property  properties  sectional  dimensional  square  box  structures  metal  hollow  of  torsion  torsional  stiffness  stiff 
october 2012 by neerajsinghvns
The world of polyethylene foam
PE Foam production

PE foam is mainly produced through extrusion technologies. The foams are created by first dissolving and mixing a gas in the molten PE, secondly expanding the gas into a lot of small bubbles or cells and finally cooling the expanded PE and thereby creating the final foam. The foam can be shaped in different semi-finishedproducts such as tubes, profiles, sheets and blocks. The expansion results in a substantial reduction of the polyethylene density. Low Density PolyEthylene (LDPE) as the raw material for these foam has typically a specific density of 920 kg/m3. On the other hand the average density of PE foams is 30 kg/m3. This weight reduction is obtained by expanding the PE approximately 30 times. But it is not only the weight that is changed during the foam process. The new properties that are gained by the PE in its foamed state are jointly responsible for the many applications of this product.
The  world  of  polyethylene  foam  sabic  epe  properties  density 
january 2011 by neerajsinghvns
Protomold » Rapid Plastic Injection Molding » Resin information
- guide to physical properties of resin types.
-Property based material search engines:
IDES—Free plastics datasheets for OEMs
protomold  injection  mold  guide  to  physical  property  properties  of  resin 
december 2008 by neerajsinghvns
UL iQ™ for Plastics
siemens UL matrixx group phoenix polycarbonate material properties Property
siemens  UL  matrixx  group  phoenix  polycarbonate  material  properties  Property 
april 2008 by neerajsinghvns

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