High stiffness plastic (unfilled) for injection molding
High stiffness plastic (unfilled) for injection molding
(OP)
Hi There,
I am looking for a high stiffness material that can be injection molded. Actually I try to use fibers to bring up the plastic strength several folds to close to that of soft metal, but a small component of this product cannot be reinforced by fibers. This component need to hold the compression type load without deformation so does not need any flexibility. So I am thinking a very stiff plastic may work. Injection moldable, very stiff. I need injection molding to produce some fine geometries. But I do not need the modulus be close to the metals.
I did a search and noticed LCP could be my best choice (15GPa) at a relatively expensive cost ($10/lb). There are others that are much cheaper but the modulus are also much lower. (2.7GPa (PET, POM) - 3.8GPa (SAN, AMMA)). I also found webpage of PrimoSpire self-reinforced polyphenylene (SRP) that claims 5.5GPa.
I never worked with LCP or SRP however. Any comments or suggestions?
Thanks in advance.
Gao
I am looking for a high stiffness material that can be injection molded. Actually I try to use fibers to bring up the plastic strength several folds to close to that of soft metal, but a small component of this product cannot be reinforced by fibers. This component need to hold the compression type load without deformation so does not need any flexibility. So I am thinking a very stiff plastic may work. Injection moldable, very stiff. I need injection molding to produce some fine geometries. But I do not need the modulus be close to the metals.
I did a search and noticed LCP could be my best choice (15GPa) at a relatively expensive cost ($10/lb). There are others that are much cheaper but the modulus are also much lower. (2.7GPa (PET, POM) - 3.8GPa (SAN, AMMA)). I also found webpage of PrimoSpire self-reinforced polyphenylene (SRP) that claims 5.5GPa.
I never worked with LCP or SRP however. Any comments or suggestions?
Thanks in advance.
Gao






RE: High stiffness plastic (unfilled) for injection molding
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: High stiffness plastic (unfilled) for injection molding
RE: High stiffness plastic (unfilled) for injection molding
What particle size and aspect ratio can phlogopite mica be?The small component is less than 1 cm and the small texture is about 1mm. For the large component we currently trying very long fibers that can can throughout the part dimension.
Cory, Thanks for reminding. I do need different properties for these two components. High strength for the large component and high stiffness for the small component. I do have some puzzle on the stiffness. The small component will receive compression load that will cause partially shearing and partially bending in the part, and the component should not deform much or break. I currently look at the flex modulus as it is popular property, but it probably not the best item to search for.
RE: High stiffness plastic (unfilled) for injection molding
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: High stiffness plastic (unfilled) for injection molding
That sounds promising. Do you happen to know a compounder of a supplier that compound phlogopite into the plastic? Or a commercial plastic grade that is filled with phlogopite.
Thank you!
Gao
RE: High stiffness plastic (unfilled) for injection molding
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com