DNA Gasket Products supplies high-quality Gland Packing, Aramid Fiber Gland Packing, Acrylic PTFE Packing, Ramie Fiber Packing, PTFE Gland Packing, Graphited PTFE Gland Packing and Carbon Fiber Gland Packing for industrial sealing applications. Our gland packing solutions are available for industries and businesses across Pune and Pimpri-Chinchwad, including Chikhali, Talawade, Chakan, Nighoje, Bhosari, Chinchwad, Tathawade, Bhamboli, Savardori, Talegaon MIDC, Narhe, Shivane, Hadapsar Industrial Estate, Ranjangaon and Baramati.
We also serve industrial requirements in major manufacturing and industrial areas including Shirwal, Mahape MIDC, Taloja MIDC and Turbhe MIDC, providing dependable gland packing and shaft sealing solutions for pumps, valves, mixers and other industrial equipment.
Gland packing (braided packing) is a soft, braided sealing material typically made from woven fibers that is compressed into the annular space of a stuffing box (the chamber around a pump shaft or valve stem) to form a seal. Multiple rings of packing material are inserted around the shaft or stem and then compressed by a gland follower (gland nut), which causes the packing to expand radially and press against the shaft and housing, thereby preventing the process fluid from leaking out. This simple technology has been used for decades and continues to be the sealing solution of choice in many valves and pumps due to its reliability and ease of adjustment. Patrons can buy these services at economical rates.
Gland packings are generally sold as braided ropes or pre-formed rings, and they come in various materials (such as graphite, PTFE, aramid, etc.) to suit different service conditions.
How Gland Packing Works
As the gland follower is tightened, the packing material is compressed. The packing must be soft enough to deform and fill all gaps, yet durable enough to withstand the media pressure and motion (rotational or reciprocating) of the equipment shaft. A correctly installed gland packing will allow a minimal controlled leakage that lubricates and cools the packing, especially in pump applications, to prevent overheating.
This controlled leakage is often visible as a slight drip and is normal for packed pumps (typically a few drops per minute) – it indicates that the packing is properly lubricated and not excessively tight.
Types of Gland Packing
Current gland packings are made from a range of fiber materials and lubricants, each type tailored for specific operating conditions. Common types of gland packing include aramid fiber packings, asbestos packings (now largely replaced by safer substitutes), graphite packings, PTFE packings, graphited PTFE combination packings, carbon fiber packings, and many other specialty materials.
Aramid Fiber Gland Packing
Aramid gland packing is braided from aramid fibers (often known as DuPont Kevlar). Aramid fibers are extremely strong and abrasion resistant, making this packing ideal for slurries, water treatment pumps, and other services where abrasive particles or high shaft speeds are present.
Aramid packings are often impregnated with PTFE and lubricants to reduce friction. They have a high resilience and maintain volume under compression, which helps avoid frequent gland adjustments.
Aramid packing's can handle moderate to high pressures and are a popular asbestos replacement due to their strength. Their temperature limit is lower than pure graphite, typically up to about 250–280 °C in steam or water, but they excel in durability.
One caution is that the very hardness that gives aramids its wear resistance can also cause shaft sleeve wear if the packing is too tight or not sufficiently lubricated. Aramid fiber packing is often used in pumps handling sand, slurries, or other abrasive media where other packing would wear out quickly.
Acrylic PTFE Packing
Acrylic PTFE braided packing is made from high-performance acrylic fibers pre-treated with PTFE (polytetrafluoroethylene) and braided diagonally. During the braiding process, it is further impregnated with a PTFE emulsion, providing excellent sealing, lubrication, and resistance to chemical media.
This braided packing is a reliable and cost-effective solution for a wide range of industrial applications, offering durability, chemical resistance, and excellent sealing performance.
It wide variety of uses throughout a plant. Used in pumps and valves, it can handle most chemicals except strong acids, strong alkalis, and strong oxidizers.
Especially for the condition of middle temperature, high pressure, high speed, and contamination is not permitted.
Ramie Fiber Packing
Ramie fiber packing is also known as “high water-based packing” due to its excellent performance in water-based media. Ramie fiber packing is clean and non-contaminating, resistant to wear and abrasion.
These advantages make it ideal for food and beverage applications and harsh environments like the paper industry.
Applications for the Brewing and Beverage Industry: Sealing pumps and valves in beer, wine, and soft drink production. Shipbuilding: Sealing applications in marine equipment.
Paper Industry: Resistant to abrasive media like paper pulp in refiners and filters.
PTFE Gland Packing (Teflon Packing)
PTFE gland packing is braided from pure PTFE (polytetrafluoroethylene) fibers, often known by the trade name Teflon. PTFE packings are chemically inert and have superb resistance to almost all corrosive fluids.
They are non-reactive across the full range of 0–14 and will not contaminate sensitive media. This makes PTFE packing ideal for applications where contamination must be avoided or where aggressive chemicals are present.
PTFE is also a very low coefficient of friction, meaning it produces minimal shaft wear and can tolerate higher shaft speeds in terms of friction (though pure PTFE can deform at high speeds/temperatures).
PTFE packings are often either plain braided PTFE or PTFE braided over carbon or graphite fibers.
Graphited PTFE Gland Packing
Graphited PTFE packing is a hybrid that combines the chemical inertness of PTFE with the improved heat conductivity and lubricity of graphite.
There are a few forms of this type: one common style is yarn made of PTFE fibers that have been impregnated with fine graphite particles (sometimes called PTFE/Graphite packing or GFO packing).
The result is a grey colored packing that is softer than pure graphite packing but can handle more heat and pressure than pure PTFE packing.
Graphited PTFE packings have very low friction and are often heavily lubricated during manufacture, which makes them easy to break in and very resistant to wear and extrusion.
Carbon Fiber Gland Packing
Carbon fiber gland packing is braided from carbonized synthetic fibers (typically acrylic or PAN fibers that have been carbonized) and often further impregnated with fine graphite and lubricants.
This produces a black packing that is strong and thermally conductive, somewhat combining features of graphite and synthetic fiber packings.
Carbon fiber packings can handle higher temperatures than pure PTFE (many are rated for services up to 400 °C or even 600 °C for some grades), though in practice they are often used in the mid-temperature range.
They resist many chemicals and can provide good sealing in pumps, valves, mixers and other equipment where high temperature or highly aggressive chemicals are present.
