PTFE is known to be the best dielectric for RF (Radio frequency) coaxial cables. The essential function of coaxial cables is to transmit high frequency energy and signals with low loss, with reflection less matching and without Phase and Amplitude distortion.

The problem in high-energy transmission is the losses because of i) cable dielectric, ii) cable construction, iii) radiation, and iv) interference with adjoining circuits.
The coaxial cable construction has been invented to overcome these problems, in which signals and energy are contained within an enclosed space. It consists of a core conductor, surrounded by pure PTFE dielectric covered with a metal shield, and finally encased in an overall jacket. The shield provides the return path as well as the confinement for RF energy, and is generally grounded.

TECHNICAL PARAMETERS OF RG COAXIAL CABLES WITH PTFE DIELECTRIC.

RG Cable	Characteristic Impedance	Core Conductor (mm)	Core Dia (mm)	Shield	Outer Dia (mm)	Continuous Working Voltage	Max Operating Frequency	Operating Temperature	Nominal Capacitance (pf/mtr)	Attenuation at 400 MHz DB/ 100m (Max)
196 A/U	50 Ohm	7 / 0.10 SPCW	0.863 PTFE	1SPC Braid	1.800 PTFE	750 VRMS	3 GHz	Cryogenic to 200°C	95.0	103.00
188 A/U	50 Ohm	7 / 0.17 SPCW	1.524 PTFE	1SPC Braid	2.490 PTFE	900 VRMS	3 GHz	Cryogenic to 200°C	95.0	65.60
187 A/U	75 Ohm	7 / 0.10 SPCW	1.600 PTFE	1SPC Braid	2.540 PTFE	900 VRMS	3 GHz	Cryogenic to 200°C	65.6	68.90
195 A/U	95 Ohm	7 / 0.10 SPCW	2.591 PTFE	1SPC Braid	3.580 PTFE	1100 VRMS	3 GHz	Cryogenic to 200°C	52.5	55.80
142 B/U	50 Ohm	1 / 1.00 SPCW	2.946 PTFE	2 SPC Braid	4.950 PTFE	1400 VRMS	12 GHz	Cryogenic to 200°C	93.5	29.50
141 A/U	50 Ohm	1 / 1.00 SPCW	2.946 PTFE	1SPC Braid	4.830 VFG-1	1400 VRMS	3 GHz	Cryogenic to 200°C	93.5	29.50
115 A/U	50 Ohm	7 / 0.71 SPC	6.350 PTFE	2SPC Braid	9.530 VFG-3	3700 VRMS	12 GHz	Cryogenic to 200°C	93.5	17.10

PTFE sleeves are made by tape wrapping and sintering process as per JSS and other specifications. PTFE sleeves/ tubings find there application in various sectors such as :-

Defence,space, aerospace, radars etc.

Electronic communication and controls equipments.

Insulation over electrical joints wherever connections are likely to be  heated.

To cover lead wires coming out of equipments.

In Switchgears.

To cover and protect hot joints in proximity with chemicals

PTFE sleeves are made available in various bore sizes ranging from 0.50 mm to 25.00 mm in different wall thicknesses. Common wall thicknesses are 0.25 mm, 0.30 mm, 0.40 mm and0.50 mm. PTFE sleeves are available in 11 solid colours and various combinations in bi-colour and tri-colour as per requirement.

S. No.	Nominal ID (mm)	Nominal wall Thickness (mm)	Overall Dia. (mm)		S. No.	Nominal ID (mm)	Nominal wall Thickness (mm)	Overall Dia. (mm)
1	0.50	0.25	1.00		10	3.50	0.50	4.50
2	0.75	0.25	1.25		11	4.00	0.50	5.00
3	1.00	0.30	1.60		12	5.00	0.50	6.00
4	1.50	0.30	2.10		13	6.00	0.50	7.00
5	1.50	0.40	2.30		14	7.00	0.50	8.00
6	2.00	0.30	2.60		15	8.00	0.50	9.00
7	2.00	0.40	2.80		16	9.00	0.50	10.00
8	2.50	0.40	3.30		17	10.00	0.50	11.00
9	3.00	0.40	3.80		18	12.00	1.00	14.00

* PTFE SLEEVES CONFORMING TO JSS SPECIFICATIONS