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We have PTFE deposited onto Silicon Wafers. Below is just one example of a recent sale.
4” PTFE (100mm) diameter wafers
Other specs vary according to your preference.
PTFE (Teflon) has excellent dielectric properties, especially at high radio frequencies in printed circuit boards used at microwave frequencies. Combined with its high melting temperature, this makes it the material of choice as a high-performance substitute for the weaker and lower-melting-point polyethylene commonly used in low-cost applications.
PTFE is commonly used in data cables and semiconductors.