What to Send for a Quote

If you know the joint, this is enough to start:

The flange: size, standard and class (or PN), or the gasket’s inside and outside diameters.
The face: raised face, flat face or ring joint.
The duty: the fluid, its maximum temperature and the pressure.
The type and thickness of the old gasket, if you know them.
The quantity and the date you need them.

What a Gasket Does, and Why Joints Leak

A gasket seals the gap between two flange faces. The bolts squeeze it into the fine marks and waviness of the faces, and it must keep sealing as the line heats, cools and vibrates.

Leaks at a flange often come from uneven bolt tightening, damaged or misaligned faces or the wrong gasket, more than from a faulty gasket. Tighten the bolts in a cross pattern, in stages, to the torque your plant’s procedure or the gasket maker’s instructions give.

Before you open a joint or measure pipework in place, isolate the line, release the pressure, drain it and let it cool, and follow your plant’s safety procedure. When you open it, loosen the bolts on the side away from you first, so that anything left in the line escapes away from you.

We are a supplier, not the maker.

Gasket Types

Tell us the type of the old gasket, or the face of the flange it sits on. The drawings are schematic, not to scale.

Spiral Wound Gaskets
A V-shaped metal strip wound in a spiral with a soft filler, usually flexible graphite or PTFE, between the turns. An outer ring centres the gasket inside the bolts and stops it being crushed too far; an inner ring, which many specifications require with PTFE filler and at higher classes, protects the winding at the bore. Used on raised-face flanges in steam, hot oil, hydrocarbon and other demanding lines.
Tell us: the flange size, standard and class, the winding metal and filler, and whether an inner ring is needed.
Sheet Gaskets: Ring and Full Face
Cut from sheet of compressed fibre, rubber, PTFE or flexible graphite, compared in the table below. A ring gasket usually sits inside the bolts on a raised-face flange; a full face gasket covers the whole face, bolt holes included, usually on a flat-face flange.
Tell us: the flange size, standard and class, ring or full face, the material and the thickness.
Ring Joint Gaskets
Type R oval and octagonal rings are solid metal rings that seat in a groove machined in each face of ring-joint flanges; with these rings the flange faces do not touch. Often used on high-pressure, high-temperature lines, as in oil and gas plants. The ring must be softer than the groove, so its metal is chosen to suit the flange. An octagonal ring fits only a flat-bottomed groove; an oval ring also fits the older round-bottomed groove. Other ring types exist, mainly for wellhead equipment; the ring number tells them apart.
Tell us: the ring number stamped on the flange rim or the old ring, oval or octagonal, and the metal.
Cover and Special-Shape Gaskets
Gaskets for machine covers, tank manholes, inspection doors and other joints that are not round. For these, send a drawing or the old gasket and the fluid, and we confirm whether we can supply it.
Tell us: a drawing, or a tracing of the old gasket on paper, its thickness, and the fluid.

How to Measure a Gasket

A ring gasket is set by its inside diameter, outside diameter and thickness. A full face gasket also needs the bolt circle, the diameter through the centres of the bolt holes, and how many holes there are and how large.

Where you can, measure the flange rather than an old gasket, which has spread and thinned under the bolts. The gasket’s inside diameter should not stand into the bore. For a standard flange, use the gasket dimensions set for its standard, size and class; standard ring gaskets commonly sit inside the bolt circle.

For a special shape, trace the old gasket or the face on paper, mark the bolt holes, and photograph the tracing beside a ruler. Send photos on WhatsApp to +91 99400 49505 or by email to [email protected].

Drawing: a full face gasket lying flat, with its outside diameter, inside diameter, bolt circle through the centres of the bolt holes and thickness marked (schematic, not to scale)

Choosing a Gasket

Choose for the fluid, the temperatures, the pressure and the flange together: a gasket that suits the fluid can still fail on heat, and one that takes the heat can still be attacked by the fluid.

Gasket Materials Compared

General guides, not ratings: the exact sheet grade, the flange and the duty set the limits, and the quotation states the gasket we propose.

Gasket materials compared
Material	Often used for	Check before choosing
Compressed non-asbestos fibre	Water, oils, fuels, air and low-pressure steam, on raised and flat faces	Its rubber binder limits the heat it takes
Rubber: NBR (nitrile)	Oils, fuels and water at moderate temperatures and low pressures	Soft, so mostly for flat faces and low bolt loads
Rubber: EPDM	Water, low-pressure steam and many dilute chemicals	Swells in oil and fuel: not for oil or fuel lines
PTFE: plain, filled or expanded	Acids, alkalis, solvents and most other chemicals	Plain PTFE flows slowly under bolt load; filled and expanded grades flow less
Flexible graphite, often with a steel insert	High temperatures, steam and thermal oil	Not for strong oxidising chemicals; the insert makes the sheet easier to handle
Metal: spiral wound and ring joint	High pressures and temperatures	Needs flange faces and bolting suited to it

Before We Select a Gasket

Send these with the flange details. What our quotation will confirm: the item we propose and its specification, what we matched it to, the quantity and availability.

Before we select a gasket
Detail	Why it matters
The fluid	It sets the material: oil swells EPDM, and strong chemicals attack rubber and fibre.
Maximum and minimum temperatures	Including start-up, cleaning and steaming out.
Operating and test pressure	The gasket must hold both, and the test pressure is usually the higher.
Flange standard, class, size and face	They set the gasket’s dimensions and type.
Flange material and condition	Cast iron, plastic or lined flanges usually need softer gaskets and lower bolt loads, as their makers specify. Have damaged or warped faces assessed against the flange and gasket instructions, and repaired where needed, before a new gasket is fitted.
Thickness	From the drawing or the old gasket; thinner sheet gaskets generally creep less. A thicker gasket is not a remedy for damaged or warped faces.
Quantity and required date	Lets us confirm availability and lead time with the quotation.

Example

Recent Supply

In 2025 we supplied and fitted gaskets, together with ball valves, on a transport company’s diesel line.

Questions Buyers Ask

Can I reuse a gasket?

No. A gasket is crushed to fit its flanges when the bolts are tightened, and it does not seal the same way a second time. Fit a new gasket each time the joint is opened.

Which gasket suits a steam line?

Spiral wound gaskets with graphite filler, and flexible graphite sheet, are common choices on steam lines; some compressed fibre sheets suit low-pressure steam, and EPDM rubber can suit low-pressure steam on flat faces. The steam pressure and temperature and the flange class decide, so send them with the flange details.

When is a PTFE gasket the right choice?

When the fluid would attack rubber and fibre: acids, alkalis, solvents and many other chemicals. Because plain PTFE slowly flows under bolt load, filled or expanded PTFE is generally used for flange gaskets.

Do you supply gaskets for plate heat exchangers?

Yes. Plate heat exchanger gaskets and plates are covered on our PHE spares and gaskets page.

Does your invoice show the HSN code?

Yes. Our GST invoice shows the HSN or SAC code for each line.

Do you keep stock?

Availability is confirmed with each quotation.

What is the price?

Prices depend on the gasket type, the material, the size and the quantity, so we quote for each enquiry.