Frequently asked questions

Find answers to common questions about us and our material!

PRODUCT RELATED QUESTIONS
What is the CTE [x/y/z] of PREPERM® products? Linear CTE Alfa is 60-70 micrometers per Kelvin and Volume CTE is 3 times alfa
Which film thicknesses do you provide? Please contact our Business Managers for detailed information.
Where can I find technical product details? Please log in/ sign up to our Technical Center.
Is PREPERM® a thermoplastic or thermoset? Thermoplastic - which means it can be processed with injection moulding or extrusion processes.
What are your bag sizes? Standard sizes are 20 kg or 25 kg/bag depending on density of the product - please sign up or log in to Technical Center to see detailed properties.
What is the temperature stability of PREPERM® (use temp)? Heat deflection value is a good indication of highest short temperature stability. Please sign up or log in to Technical Center to see detailed properties.
What is the weight of PREPERM®? Please sign up or log in to Technical Center and see detailed properties for density.
Is PREPERM® ROHS, conflict mineral and REACH compliant? Yes
What is the mould shrinkage of PREPERM®? Typically 0.3-1.0. Please sign up or log in to Technical Center and check detailed properties of the selected grade.
Is PREPERM® brittle? PREPERM® is less brittle than ceramic materials although more brittle than neat polymers. The higher the dielectric constant the more brittle the material becomes, although Premix's polymer expertize can be utilized to customize special grade to full fill most of the requirements.
What is the εr tolerance? Typically 2-3 %. Please sign up or log in to Technical Center to see detailed properties of the selected grade.
Is PREPERM® flame-resistant? Depends on grade – special grades with V0 UL94 rating can be offered. Contact sales/R&D, when needed.
What is the dielectric strength of PREPERM®? Please contact our Business Managers with detailed parameters for more information.
Do you have foams? This is currently under evaluation.
Do you have absorbers? No.
Does PREPERM® have glass fibers? Normally no - can be added if needed in application. Glass fibers tends to have bad impact on RF performance and should not be used.
What is the thermal conductivity of PREPERM®? For PPE260 the thermal conductivity is 0.2 W/mK. As the dielectric constant increases, also the thermal conductivity increases. For PPE950 the thermal conductivity is 0.7 W/mK.
PROCESSING RELATED QUESTIONS
Can PREPERM® be injection moulded? Yes, please log in to Technical Center to see more details in a specific guideline.
Can PREPERM® be CNC'd / machined? Yes, please log in to Technical Center to see more details in a specific guideline.
Can PREPERM® be painted? Yes, please log in to Technical Center to see more details in a specific guideline.
Can PREPERM® be glued? Yes, please log in to Technical Center to see more details in a specific guideline.
Can we use regrind in our process? Mechanical properties are not significantly changed, but a risk of contamination exists. This is not recommended by Premix.
Does PREPERM® work in 2K or insert moulding? Yes.
Have you measured porosity? Parts made from PREPERM® are not porous when injection moulding or extrusion process is done correctly.
POST-PROCESSING RELATED QUESTIONS
Does PREPERM® enable etching? PREPERM® material withstands chemicals used in etching. Please note PREPERM® material does not come with copper surfaces.
Does PREPERM® withstand SMT / reflow? PREPERM® PPE -series can withstand low temperature soldering (maximum 180C set temperature). PEEK and LCP -series can withstand high temperature SMT process
Do you support roll to roll films? Yes.
Which metallization methods are possible? Conductive inks, sputtering, vacuum metallization, various laser printing methods.
Is it possible to produce a PCB or FPCB from PREPERM®? Single or multilayer? PREPERM® is a dielectric material without a metal layer. Metal layers needs to be added in post process with some metallization technology.
How good is PREPERM®'s adhesion to metals? Quite good, although mechanical interlocking is recommended.
SALES AND MARKETING RELATED QUESTIONS
How can I collaborate in your blog? Please contact Dr. Jan Järveläinen.
I wish to be your distributor, how do we proceed? Please contact  Business Director Mr. Tuomas Kiikka.
Do you have a distributor in  my country? Please see the Premix Group website for a complete list of distributors.
Which countries do you have representatives or sell directly to? Please contact our Business Managers for country-specific, up-to-date information.
How can we do joint marketing? Please contact our Business Managers.
What is your lead time? The standard lead time is four weeks - Please contact our customer service for details.
What are the delivery costs? Please see our Webshop for standard products. The deliver costs of granule products are based on volume. Please contact customer service for details.
Do you provide free samples? Please see our Webshop for available products and prices.
Are we able to purchase ready-made components of pieces directly from you? Yes. We can offer a solution based on your request.