FAQ

The maximum length available for PTFE lined pipes is typically up to 6 meters (custom lengths may be available on request).

PTFE lined pipes can typically be manufactured up to a diameter of 600 NB, with larger sizes possible on special request.

Longer PTFE lined pipes reduce joints, minimize leakage risk, and ensure smoother flow for critical applications. Also reduces cost.

The minimum PTFE liner wall thickness as per ASTM F1545 is 3.2 mm. Thickness varies between 3.2 to 12 mm as per diameter and vacuum conditions.

PTFE is the chemical name of the polymer, while Teflon™ is the brand name for products made from PTFE.

Common lining materials include PTFE, PFA, FEP, ECTFE, PVDF, HDPE and PP, depending on chemical compatibility and application.

PTFE lining is manufactured by paste extrusion, offering excellent chemical resistance but slightly less flexibility, while PFA lining is melt-processable, providing a smoother surface and better stress-crack resistance. PFA is often preferred for high-purity applications like pharmaceuticals and semiconductors due to its ultra-clean properties. As a result of its processing and performance advantages, PFA lining is generally more expensive than PTFE lining.

PTFE lined pipes are tested through visual inspection, dimensional checks, pressure tests, and ASTM F1545 compliance to ensure industrial qualification.

This is a type test to be performed on plastic lined carbon steel piping. It involves many stringent tests like High Temperature test, Low temperature test, Vacuum test, steam water cycle test, liner thickness, adhesion, and chemical resistance for safe industrial use.

Visual Inspection, Spark test at 15 KVDC and Hydro test at 29 Kg/cm² holding for 3 min, as per ASTM F1545 are mostly followed routine test for lined items and most of the times they are performed on 100% products.

PTFE-lined fittings are paste-extruded, slightly less flexible, and cost-effective, while PFA-lined fittings are melt-processable, smoother, more flexible, and generally more expensive, making them suitable for high-purity applications.

Seamless lining offers maximum chemical resistance, uniform protection, and minimal leakage risk, while welded sheet lining provides flexibility for large or complex shapes and is more cost-effective.

Yes, PTFE lined pipes and fittings can be used for full vacuum service, provided proper support and wall thickness are maintained.

Machined PTFE bellows are made from solid PTFE Bush and offer high dimensional precision, while moulded PTFE bellows are produced in a single mold, allowing complex shapes but with slightly lower precision.

Antistatic PTFE lined pipes contain conductive additives to safely dissipate static electricity, while standard PTFE lined pipes do not and are purely non-conductive.

Vent holes are important to remove any entrapped gases between PTFE liner and pipe. It helps to avoid any premature collapse of PTFE liner especially under full vacuum conditions and at elevated temperatures.

Yes, PTFE lined columns can be manufactured with a seamless, one-piece liner, eliminating welded joints for maximum chemical resistance and reliability. It is possible up to 600 NB PTFE lined column.

Yes, PTFE lined equipment can often replace exotic metals like Titanium or Hastelloy in corrosive applications, providing chemical resistance at a lower cost and without metal corrosion concerns.

PTFE lined pipes are generally more expensive than rubber lined pipes due to their superior chemical resistance and high-performance properties. But in the longer run PTFE lined pipes are more economical compared to rubber lining, as life is 2–3 times higher than rubber lining.

Yes, PTFE is FDA-compliant and can be used in applications requiring food, pharmaceutical, or high-purity chemical contact.

Yes, PTFE-lined pipes are suitable for seawater handling due to their excellent corrosion resistance and chemical inertness.

Yes, PTFE lined piping can be used in effluent treatment applications because of its excellent chemical resistance and durability in corrosive environments.

Injection moulding is a manufacturing process where molten material is injected into a mold to form a desired shape. PTFE cannot be used for conventional injection moulding because it cannot be melt-processed, unlike PFA or FEP, which are melt-processable fluoropolymers.

Yes, PTFE is inherently fire-resistant and can withstand high temperatures up to around 260°C without supporting combustion.

PTFE lined pipes are available in ready stock for standard sizes, but custom sizes usually require manufacturing lead time.