Taconic is a privately owned company, specializing in coating of glass fabrics with PTFE:
Introducing Advanced Dielectric Division ADD
Taconic Advanced Dielectric Division manufactures PTFE/woven glass base materials for microwave, RF and high speed digital applications. Applications include LNAs, LNBs, PCS/PCN antennas, GSM and UMTS antennas, power amplifiers, filters, passive components, automotive cruise control, aerospace guidance telemetry, phase array radar, etc

Taconic	Product Selection	Data sheet
RF-35TC		Data sheet
RF-35A2		Data sheet
RF-35		Data sheet
RF-35P		Data sheet
RF-301		Data sheet
RF-30		Data sheet
TLF	TLF-34 / TLF-35	Data sheet
TRF	TRF-41 / TRF-43 / TRF-45	Data sheet
RF-41 / 43 / 45	RF-41 / RF-43 / RF-45	Data sheet
RF-60A		Data sheet
CER10		Data sheet
TLA		Data sheet
TLC		Data sheet
TLE		Data sheet
TLP		Data sheet
TLT		Data sheet
TLX		Data sheet
TLY		Data sheet
TACBOND		Data sheet

Please note that the data provide here is only advisory and you should check directly with the manufacturer in case of any updates or incorrect data.