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Klinger Maxiflex

Spiral Wound Gaskets

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Maxiflex spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange face temperature variations, flange rotation, bolt stress relaxation and creep. The gasket sealing element consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces. The metal strip holds the filler giving the gasket mechanical resistance and resilience. 

Product Advantages

Maxiflex spiral wound gaskets combine the ease of sealing a graphite, PTFE or mica filler with the strength afforded by a specially profiled metallic, spring-like reinforcement. The sealing element is manufactured by interleaving plies of alternating metallic winding strip and filler to create a gasket that is robust and easy to install. Maxiflex spiral wound gaskets create a very tight and reliable seal suitable for high temperature and pressures and can be manufactured to suit standard flanges and also custom-designed vessels.

Maxiflex gaskets are capable of giving an excellent seal over a wide range of flange surface finishes, but as a general guide we suggest under general duties, a flange surface finish of 125-248μin. (3.2-6.4 μm).

Maxiflex-R-and construction-image

Maxiflex Spiral Wound Gasket Construction

Above is the “Maxiflex” spiral wound gasket’s basic sealing element. Several layers of specially formed continuous chevron-shaped metal strips are spirally wound with alternate plies of soft filler strip.

The chevron profile allows the gasket to act as a spring and the depth is carefully controlled to give the sealing element the best compression and recovery characteristics. Maxiflex spiral wound gaskets are manufactured to specifications of ASME B16.20.

Computer controlled winding machines carefully monitor and adjust the tension of the winding strips. A uniform density throughout the product is produced. This provides the springlike action within the gasket that resists buckling and maintains a seal even when subject to fluctuating compressive loads.

Maxiflex Thickness After Installation

Spiral wound gaskets are manufactured in a number of standard thicknesses which are designed to compress to a specific thickness to attain the best sealing performance and adaptation to the flanges. The thickness is measured to the metallic windings not to the filler.


KLINGER Maxiflex spiral wound gaskets are manufactured on a fully automated production system at KLINGER Ltd. in the UK in compliance with ASME B16.20 and other global/industry standards.

We have full inventory of standards ranging from Class 150 to Class 600 in various sizes, materials and styles in our Houston, Texas warehouse. Other configurations, sizes, materials or styles can be made to order. Call Thermoseal at 800-990-7325 with your requests.

Houston-spiral-inventory-1 Houston-spiral-inventory-2

Material and Temperature Specifications

KLINGER Maxiflex spiral wound gaskets can be manufactured from a wide range of metals to resist against chemical attack and temperature related degradation and used in combination with either graphite, PTFE or mica filler in accordance with ASME B16.20. Gaskets are color coded to help expedite the selection and identification of the gaskets. The filler material is indicated with a color stripe on the OD. The color on the entire outer edge of the OD indicates the winding material.

Please note: The temperatures given are for guidance only and do not apply in all fluids. Please contact Thermoseal’s customer service department for advice. KLINGER Maxiflex spiral wound gasket dimensions available in accordance with ASME B16.20 used with ASME B16.5 or ASME B16.47 flanges. DIN, BS10, and JIS standards are available upon request. Custom special gaskets are also available upon request.

Filler Material Maximum Temperature ASME B16.20 Color Coding
Graphite 932°F / 500°C Grey Stripe
PTFE 500°F / 260°C White Stripe
Mica 1832°F / 1000°C Light Green Stripe
Mica and Graphite 1652°F / 900°C N/A
Metallic Winding Material Maximum Temperature ASME B16.20 Color Coding
Carbon Steel 932°F / 500°C Silver
304L Stainless Steel 1202°F / 650°C Yellow
316L Stainless Steel 1472°F / 800°C Green
347 Stainless Steel 1598°F / 870°C Blue
321 Stainless Steel 1598°F / 870°C Turquoise
Monel 400 1472°F / 800°C Orange
Nickel 200 1112°F / 600°C Red
Titanium 842°F / 450°C Purple
Hastelloy B-2 932°F / 500°C Brown
Hastelloy C-276 842°F / 450°C Beige
Inconel 600 1832°F / 1000°C Gold
Inconel 625 842°F / 450°C Gold
Inconel X-750 1832°F / 1000°C Light Grey

KLINGER Maxiflex spiral wound gaskets are available in a range of configurations and materials. Below are the most common gasket types:

When ordering, please specify: Gasket Style, Nominal Pipe Size, Pressure Class, Gasket Standard, Outer Ring Material/Winding Material/Filler Material/Inner Ring Material
Example: CRIR 2" 150# B16.20 CS/316L/GRA/316L

Contact Thermoseal at 800-990-7325 for specials