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 Polyethylene Plastic PE Films Glossary

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MACHINE DIRECTION
(MD)
 

Direction the film is being pulled through a machine much like the direction of woodgrain.

 

 

       

MEDIUM DENSITY POLYETHYLENE
MDPE

 

Polyethylene having a density ranging from .929 to .940 grams/cc.  Learn more from our blog post What is Polyethylene?

     
MELT INDEX(MI)  

a.k.a "melt flow index" or "melt flow rate".

Measure of viscosity (resistance to flow) of a resin by ASTM D 1238.

The amount of polymer which exits the die in ten minutes is measured in grams. In general terms, the lower melt index resin which has more viscosity will be stronger than a higher melt index and trade off clarity or haze. If the number of grams extruded is less than 1, the resin is referred to as a "fractional melt" (less than 1.0.)

 

 

     
METALLOCENE   Latest generation of resin technology utilizing a metallocene catalyst which is basically tiny particles of positively charged metal ions sandwiched between two rings of carbon atoms that have five atoms apiece.

Metallocene is not a comonomer; it is a catalyst which imparts consistent molecules. Metallocenes are not necessarily stronger than LDPE or LLDPE.
     
MIL   One thousandths ( 1/ 1000 ) of an inch expressed as "001". Metric equivalent is 25.4 microns.
     
MONOMER   Small molecule ( ethylene, propylene, styrene, etc. ) that may become chemically bonded to other monomers to form a polymer.