Shrinkage and Warpage Mechanism of Overflow Water-Assisted Injection Molding Short Fiber-Reinforced Polymers

Table 2

Characteristics of polypropylene-based short fiber composites.

Characteristic parameters	PP	20% SGFPP	30% SGFPP	40% SGFPP
Melt flow rate (230°C/2.16 kg)	22 g/10 min	6.0 g/10 min	5.0 g/10 min	3.0 g/10 min
Density (23°C)	0.9 g/cm^3	1.03 g/cm^3	1.12 g/cm^3	1.21 g/cm^3
Tensile stress at yield	25.3 MPa	50.0 MPa	61.0 MPa	73.0 MPa
Flexural modulus	1017 MPa	3300 MPa	4700 MPa	5900 MPa
Notched izod impact strength (23°C)	5.0 kJ/m^2	14 kJ/m^2	18 kJ/m^2	19 kJ/m^2