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Braskem PB681 LDPE Cast and Blown Film Extrusion, Injection Molding Polyethylene

Category Polymer , Film , Thermoplastic , Polyethylene (PE) , LDPE , Low Density Polyethylene (LDPE), Film Grade
Manufacturer Braskem
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Braskem PB681 LDPE Cast and Blown Film Extrusion, Injection Molding Polyethylene.pdf
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Material Notes:
PB681 is a resin produced under high pressure in a tubular reactor. This resin presents excellent 'draw down' (stability to form fine films). The films produced with this resin have excellent optical properties. It does not contain additives. It is used in LLDPE and HDPE blends. For blown film extrusion processing the screw - L/D relation should be 16 to 30:1, the compression rate should be 3 to 4:1, and the frost line height should at most be equivalent to the bubble diameter. For cast film extrusion processing the screw - L/D relation should be at least 20:1.
Physical Properties Metric English Comments
Density 0.922 g/cc
0.0333 lb/in³
ASTM-D1505
Melt Flow 3.8 g/10 min

@Load 2.16 kg,
Temperature 190 °C
3.8 g/10 min

@Load 4.76 lb,
Temperature 374 °F
ASTM-D1238
Mechanical Properties Metric English Comments
Film Elongation at Break, MD 370 %
370 %
ASTM-D882
Film Elongation at Break, TD 1070 %
1070 %
ASTM-D882
Elmendorf Tear Strength TD 100 g
100 g
ASTM-D1922
Elmendorf Tear Strength, TD 2.63 g/micron
66.8 g/mil
ASTM-D1922
Dart Drop 1.58 g/micron
40.1 g/mil
ASTM-D1709
Dart Drop Test 60.0 g
0.132 lb
ASTM-D1709
Film Tensile Strength at Break, MD 30.0 MPa
4350 psi
ASTM-D882
Film Tensile Strength at Break, TD 20.0 MPa
2900 psi
ASTM-D882
Optical Properties Metric English Comments
Haze 4.0 %
4.0 %
ASTM-D1003
Gloss 120 %
120 %
Angle 60°; ASTM-D2457
Processing Properties Metric English Comments
Die Temperature 250 - 290 °C
482 - 554 °F
Cast Film Extrusion
Mold Temperature 5.00 - 25.0 °C
41.0 - 77.0 °F
Injection Molding
Blow-up Ratio (BUR) 2.0 - 3.0
2.0 - 3.0
Blown Film Extrusion
Roll Temperature 40.0 °C
104 °F
Chill
Descriptive Properties Value Comments
Screen Package 40/60/40
mesh, Blown Film Extrusion
Temperature Profile (°C) 110
Blown Film Extrusion: 1st zone
140
Blown Film Extrusion: From the screw to the die
150
Blown Film Extrusion: Die
180-220
Injection Molding
180-250
Cast Film Extrusion: Screw
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