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PureFlex MTH™ Smooth Bore Flexible Metal Hose, PTFE Lined

The PureFlex MTH™ Smooth Bore Flexible Metal PTFE Lined Hose is a stainless steel (other alloys available upon request) flexible metal hose lined with smooth PTFE liner and flared thru standard end fittings. Designed for applications requiring a large diameter smooth bore flexible hose combining the unexcelled corrosion resistance and sanitary properties of PTFE and the durability of flexible metal hose. This smooth bore hose is specified and used in an endless variety of applications where the conditions of service are beyond the capabilities of rubber, synthetic or metal hose alone. The PTFE smooth bore I.D.’s minimize pressure drop. MTH is available with virgin PTFE liner.

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Product Features & Benefits

  • CORROSION RESISTANT:  PTFE is fully resistant to the broadest range of industrial chemicals and has a zero-corrosion rate, lower life cycle costs and is non-contaminating.
  • CLEANABLE: Non-Stick, low porosity tube does not trap bacteria, and can be readily cleaned with steam, detergents, caustics or solvents.
  • SANITARY: FDA approved materials meet or exceed 3A requirements.
  • COMPATIBLE: Will not contaminate or impart a taste, color or odor to any media.
  • DURABLE: Designed for extended use in hostile environments involving severe chemical, thermal and mechanical stresses. Does not suffer aging or embrittlement, even with extreme thermal cycling.
  • DOUBLE CONTAINMENT: Metal housing is a secondary containment vessel.

PTFE "Flared-Thru" Fittings

The thick PTFE tube passes through the end fitting and is flared radially outward against the sealing face of the fitting. This economical design creates a continuous PTFE fluid conduit. Standard fitting style available is ANSI B16.5 CL150 Flanged.  Flange materials available in Epoxy coated Carbon Steel, Durcor composite, 304SS and 316SS.

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Hose Cover Options

  1. Silicone Cover
  2. Anti Scuff Sock
  3. Fire Sleeve
  4. Polyolefin Hat Shrink (other colors available)
  5. Anti Kink Guard
  6. Spring Guard
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Electrically Heated Option

Electrically heated options may be applied to many of the hose assemblies available from PureFlex®. Our superior insulations and precisely applied heating elements provide the most temperature-stable heated hoses on the market. PureFlex heated hoses are excellent for maintaining viscosity control, freeze protection, and dispensing temperature-sensitive media. Temperature options available from ambient to 450°F (hose selection dependent).

If interested in learning if the electrical heated option can be applied to your specific hose requirements, please complete the Electric Heating Option Form and submit to  


Temperature Range: -65°F(-54°C) to +350°F(232°C)
Working Pressure(psi) Vaccuum
(in. -Hg)
per FT.
CL 150 Flanges CL 300 Flanges
70°F 350°F 70°F 350°F
1 1.53 285 210 485 450 29.9 9 0.9
1 1/2 2.16 285 210 485 450 29.9 12 1.5
2 2.69 285 210 450 450 29.9 17 2
3 3.98 285 210 350 350 29.9 22 3.5
4 5.06 285 210 300 300 29.9 36 4.8
6 7.13 210 210 210 210 29.9 50 9.1
8 9.32 250 210 250 250 29.9 82 15.3
10 11.56 175 175 175 175 N/A 120 20.3


Minimum allowable temperature applicable only to stainless steel flanged assemblies; carbon steel flanged assemblies are limited to -20°F.


  • Pharmaceuticals
  • Food & Beverage
  • Large Diameter Applications

Technical Details

  • Applications: Double contained, heavy duty, chemical resistant
  • Liner material: PTFE
  • Cover: Stainless flexible metal
  • Size range: 1" to 10"
  • Pressure rating: Full vacuum to 275 PSI
  • Temperature range: -65°F to +350°F
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View Our Chemical Resistance Guide

This resource is intended as a guideline to be used with all available information to determine suitability of material selection. We suggest thorough research which should include known applications when determining material. The information contained herein is provided only as a guide for the use of ANDRONACO INDUSTRIES products.

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