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Rulon Bearings

Röhm Acrylite Plus® zk4BR Impact Acrylic Polymer  (discontinued **)
Categories: Polymer; Thermoplastic; Acrylic (PMMA); Acrylic, Impact Modified, Molded

Material Notes:

Information Provided by Evonik CYRO. The former Evonik Methacrylates business has been sold to Röhm (Roehm) GmbH.

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.18 g/cc1.18 g/ccASTM D792
Bulk Density 0.710 g/cc0.0257 lb/in³ASTM D1895
Water Absorption <= 0.30 %<= 0.30 %ASTM D570
Linear Mold Shrinkage 0.0040 - 0.0070 cm/cm0.0040 - 0.0070 in/inASTM D951
Melt Flow 4.5 g/10 min
@Load 3.80 kg,
Temperature 230 °C
4.5 g/10 min
@Load 8.38 lb,
Temperature 446 °F
ASTM D1238
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell M 8383ASTM D785
Tensile Strength at Break 75.8 MPa11000 psiASTM D638
Elongation at Break 19 %19 %ASTM D638
Elongation at Yield 5.0 %5.0 %ASTM D638
Tensile Modulus 2.96 GPa430 ksiASTM D638
Flexural Strength 102 MPa14800 psiASTM D790
Flexural Modulus 2.76 GPa400 ksiASTM D790
Izod Impact, Notched 0.251 J/cm
@Diameter 6.35 mm
0.470 ft-lb/in
@Diameter 0.250 in
BAR; ASTM D256
 
Thermal PropertiesMetricEnglishComments
CTE, linear 72.0 µm/m-°C
@Temperature 0.000 - 100 °C
40.0 µin/in-°F
@Temperature 32.0 - 212 °F
ASTM D696
Deflection Temperature at 1.8 MPa (264 psi) 98.9 °C
@Thickness 6.35 mm
210 °F
@Thickness 0.250 in
Annealed; ASTM D648
Vicat Softening Point 104 °C219 °FASTM D1525
 
Optical PropertiesMetricEnglishComments
Haze <= 2.0 %<= 2.0 %ASTM D1003
Yellow Index 0.20 %0.20 %ASTM E313
Transmission, Visible >= 90 %>= 90 %ASTM D1003
 
Processing PropertiesMetricEnglishComments
Middle Barrel Temperature 232 - 249 °C450 - 480 °FCylinder Temp
Melt Temperature 232 - 249 °C450 - 480 °F
Mold Temperature 43.3 - 82.2 °C110 - 180 °F
Drying Temperature 82.2 °C180 °F
Dry Time 3 - 4 hour3 - 4 hour

**
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