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PTFE lined blind flange with fluoropolymer facing covering the raised face
Lined Fittings

PTFE Lined Blind Flange

Lined blind flange, NB 1/2" to 16", 12–36.6 mm thick

Lined blind flange to close off a lined line or vessel nozzle — NB 1/2" to 16", available in PTFE, PFA and FEP across the whole range.

Request a quotation Full technical data and dimensions Request the datasheet
At a glance
Product typeLined blind flange
Body / steel gradeIS 2062 plate / ASTM A 105
Lining materialPTFE / PFA / FEP
Liner standardASTM D 1457 / ASTM D 4894-19 (PTFE), ASTM D 3307 (PFA), ASTM D 2116 (FEP)
Lining optionsVirgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116
Flange standardASME/ANSI B16.5
Flange classClass 150 standard; Class 300 on request
Size rangeNB 1/2" to NB 16"

Product overview

What it does, and where it fits.

A blind flange closes the end of a lined run, blanks a spare nozzle or isolates a branch for maintenance. The lined version presents a fluoropolymer face to the process so the dead end does not become the corrosion point of the system.

The flange is cut from IS 2062 plate or ASTM A 105 and drilled to ASME/ANSI B16.5 Class 150. Unlike most items in the range, PTFE, PFA and FEP are all marked applicable in every size from NB 1/2" to 16". Thickness runs from 12 mm at NB 1/2" to 36.6 mm at NB 16".

Blind flanges are not drilled with vent holes.

Features

Built into every unit.

  • PTFE, PFA or FEP facing available in every size NB 1/2" to 16"
  • IS 2062 plate or ASTM A 105, drilled to B16.5 Class 150
  • Thickness 12 mm at NB 1/2" to 36.6 mm at NB 16"
  • No vent hole — solid lined closure
  • Class 300 drilling and stainless steel bodies on request

Benefits

Why it earns its place in the line.

  • Outstanding corrosion resistance to aggressive organic and inorganic chemicals across a wide temperature range
  • Non-stick, non-wetting bore — low surface energy keeps product moving and simplifies cleaning
  • Chemically inert and pure; no additives, plasticisers, stabilisers or lubricants to contaminate the process fluid
  • The lowest coefficient of friction of any solid, reducing pressure drop and deposit build-up
  • Completely resistant to hydrolysis with an excellent barrier to water permeation
  • Steel strength on the outside, fluoropolymer chemistry on the inside — at a fraction of the cost of solid exotic alloys

Applications & industries

Where it is specified.

Typical applications

  • Closing the end of a lined pipe run
  • Blanking spare vessel and header nozzles
  • Isolating a branch for maintenance or hydrotest
  • Future tie-in points left blanked during construction

Industries served

  • Chemical processing
  • Pharmaceutical
  • Petrochemical
  • Oil & gas
  • Power generation
  • Pulp & paper
  • Mining & metallurgy
  • Agrochemicals & dyes

Technical data

Specification for PTFE Lined Blind Flange.

Figures below are for this product only — every item in the range carries its own dimension table.

PTFE Lined Blind Flange — technical specification
Product typeLined blind flange
Body / steel gradeIS 2062 plate / ASTM A 105
Lining materialPTFE / PFA / FEP
Liner standardASTM D 1457 / ASTM D 4894-19 (PTFE), ASTM D 3307 (PFA), ASTM D 2116 (FEP)
Lining optionsVirgin or anti-static (conductive black) PTFE to ASTM D 4894 & D 4895, PFA to ASTM D 3307, FEP to ASTM D 2116
Flange standardASME/ANSI B16.5
Flange classClass 150 standard; Class 300 on request
Size rangeNB 1/2" to NB 16"
Temperature rangeContinuous service to 260 °C (PTFE melting point 327 °C, PFA 306 °C, FEP 260 °C)
Pressure ratingASME/ANSI B16.5 Class 150 flanges as standard; Class 300 available on request
Manufacturing standardASTM F 1545
Spark testingEvery lined component spark tested at 5000 × E volts (E = liner thickness in mm), to a maximum of 15 000 V
Hydro testingHydrostatic or pneumatic test according to the lining technique; hydrostatic test on components with vent holes
InspectionDimensional and visual examination of liner and steel parts — weld aspect, overall dimensions, collar size, liner thickness, surface flaws and paint thickness
Vent holesNone — the catalogue excludes blind flanges from vent hole drilling
External protectionZinc epoxy primer, minimum 60 μm dry film, over steel sand-blasted to SA 2.5
CertificationEN 10204 3.1 mill certificates and FDA certification for the fluoropolymer available on request
Thickness12 mm to 36.6 mm, size dependent
PTFE Lined Blind Flange — thickness and lining availability
SizeFace to face F (±2)PTFEPFAFEP
0.5"12✓✓✓
0.75"12.7✓✓✓
1"14.3✓✓✓
1.5"17.5✓✓✓
2"19✓✓✓
2.5"22.4✓✓✓
3"23.9✓✓✓
4"23.9✓✓✓
6"25.4✓✓✓
8"28.5✓✓✓
10"30.3✓✓✓
12"31.8✓✓✓
14"35.1✓✓✓
16"36.6✓✓✓

All dimensions in mm. All three lining materials are marked applicable across the full size range.

Available on request

  • ANSI B16.5 Class 300
  • Stainless steel body
  • Higher diameters on request

FAQ

Questions we are asked about this item.

Yes — that is one of its normal uses. Bolt it up with the same torque values used for the rest of the line and cross-tighten as with any flange joint.

Not against another lined flange face, where the flared liners seal against each other. A gasket is needed when it is bolted against a different material.

Enquiry

Tell us your line size — we'll confirm the spec.

Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.

Enquire on WhatsAppChat to us on +91 90336 30547 Request the datasheetWe will email the drawing for this item Talk to a technical expertMaterial selection and duty review Send a drawingWe fabricate to your isometric or sketch Request a custom sizeNon-standard bores, lengths and drilling

Not sure which spec fits your process?

Send your requirement — media, temperature, pressure, dimensions — and we'll recommend the right product or fabricate it.

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