Material Properties & Applications

Industrial Service Scope

Critical Support to Core Global Industries

Sag Engineers supplies PTFE solutions to Chemical Plants, Cement, Solvent Extraction, Fertilizers, Plastics, Rubber, Light & Heavy Engineering Industries, and many other leading Industrial Houses across India and overseas.

1. Chemical Resistance

Sag Engineers PTFE products are completely inert to virtually all known chemicals even at temperatures as high as 260°C continuous service and under extreme mechanical pressures. They impart excellent chemical resistance to strong inorganic acids (hydrochloric, sulfuric, nitric, aqua regia), concentrated alkalis, organic chemicals, and all known solvents.

Note: PTFE is attacked only by elemental Fluorine, strong fluorinating agents (such as chlorine trifluoride), and molten alkali metals at elevated pressures.

Typical Applications: Flange gaskets, 'O' rings, flat 'V' rings, pump and valve diaphragms, impeller liners, pipe expansion joints, stirrers, piston rings, plugs and balls for valves, rotameter floats, non-return valve balls, laboratory beakers, crucibles, mechanical seals, nuts and bolts.

2. Electrical & Dielectric Resistance

PTFE is one of the premier electrical insulating materials known to engineering science. It boasts exceptionally high volume and surface resistivity (> 10¹⁸ Ohm•cm), high dielectric strength (40 to 80 kV/mm), and an ultra-low dielectric constant (2.0 – 2.1) invariant across frequencies from 60 Hz to microwave regimes. It possesses the highest tracking resistance rating and excellent high-voltage arc and corona resistance.

Typical Applications: High-tension bushings and insulators in high-voltage switchgear, nozzle and outlet orifices of high-tension power switches operating with sulfur hexafluoride (SF6), hermetic capacitor seals, coaxial cable spacers, brush holders in collector motors, transistor sockets, plug connectors, and slot insulation of motors and transformers.

3. Heat / Temperature Resistance & Cryogenic Stability

Sag Engineers PTFE components possess the highest thermal stability among all commercially available engineering plastics and fluoropolymers. They operate continuously at temperatures ranging from -200°C to +260°C retaining excellent tensile strength, flexibility, and elasticity. Intermittent duty is possible up to +300°C.

Furthermore, PTFE withstands cryogenic extremes without loss of physical integrity, operating safely at -206°C (liquid helium temperatures) without undergoing brittle fracture.

Typical Applications: Non-lubricated compressor piston and rider rings, valve disc guides, high-temperature electrical insulation bushings, nuclear equipment and reactor gaskets, cryogenic ball valve seals, and high-temperature expansion bellows.

4. Ultra-Low Friction Resistance

PTFE exhibits the lowest coefficient of friction among all solid engineering materials (0.05 to 0.10). Notably, its static coefficient of friction is virtually identical to its dynamic coefficient, completely eliminating the "stick-slip" phenomenon. Even when compounded with 5% to 40% fillers (glass, bronze, carbon, graphite), our filled PTFE retains remarkably low friction while offering increased surface hardness and load-bearing endurance.

Typical Applications: Dry-running sleeve bearings, self-lubricating bushes, rotating shaft seals, oil seal rings, slide bearing plates for bridges and heavy structural pipelines, pneumatic piston seals, and non-lubricated plug valve sleeves.

5. Non-Stick Properties

As a result of very low intermolecular forces arising from the high bond energy between carbon and fluorine atoms and the low polarizability of fluorine, virtually no substance will adhere or stick to PTFE surfaces. Residues, viscous adhesives, and resins detach effortlessly.

Typical Applications: Chutes and hoppers for sticky powders, bakery and food conveyor roller sleeves, chemical reactor linings, flexible transfer hoses, and laboratory dispensing beakers.

6. Non-Toxicity & High Purity

Being physiologically inert, non-porous, and unreactive with organic tissues, Sag Engineers 100% Virgin PTFE is completely non-toxic and compliant with FDA guidelines for direct contact with food, beverages, active pharmaceutical ingredients (APIs), and biological fluids.

Typical Applications: Pharmaceutical bottling equipment, food grade valve seats and sanitary clamp gaskets, biochemical dialysis adaptors, and high-purity laboratory crucibles.

7. Weather & Aging Resistance

Because PTFE contains zero plasticizers, oils, or vulnerable chemical bonds, it is completely immune to ultraviolet (UV) radiation, atmospheric ozone, humidity, salt spray, and extreme sunlight. Outdoor exposure spanning decades produces no measurable embrittlement, discoloration, or loss of mechanical tensile properties.

Typical Applications: Outdoor architectural fabric slide bearings, solar collector seals, marine bridge expansion joints, and offshore drilling platform fluid conduits.

Industries We Supply