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Brand: Klinger
Klinger top-chem 2005 Acid-Resistant PTFE Gasket Sheet
Description
Red inorganic-filled PTFE aimed at strongly acidic duty
KLINGER top-chem 2005 is a PTFE material with inorganic fillers, supplied as a red sheet. Klinger names outstanding performance and high chemical resistance in strongly acidic applications, suitability for a wide range of chemical-industry uses and a role as an economical alternative among filled PTFE gaskets.
The product page lists use mainly in acids, consistent material composition and resistance to cold flow as features, and excellent chemical resistance, very good mechanical properties at medium temperatures and no ageing as benefits. Sheets are 1500 x 1500 mm in 1.0, 1.5, 2.0 and 3.0 mm thickness.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / model | Klinger (Rich. Klinger Dichtungstechnik), KLINGER top-chem 2005 |
| Basis composition | PTFE filled with inorganic fillers |
| Colour | Red |
| Sheet size | 1500 x 1500 mm |
| Thickness | 1.0, 1.5, 2.0, 3.0 mm |
| Tolerances | Thickness per DIN 28091-1; length and width plus or minus 50 mm |
| Certificates and approvals as printed | Oxygen-tested, DIN-DVGW, WRAS approval, DNV approval, TA-Luft (Clean air), FDA conformity (components comply with FDA requirements), Regulation (EU) No. 1935/2004 (incl. 10/2011), VDI 2200 blowout |
| Industries listed | General industry, chemical, oil and gas, energy, infrastructure, pulp and paper, marine, automotive, food and beverage, pharma |
| Compressibility, ASTM F 36 M (2.0 mm) | 4 % |
| Recovery, ASTM F 36 M | 40 % |
| Stress relaxation, DIN 52913, 30 MPa, 16 h | 25 MPa at 150 °C (30 MPa) |
| Klinger cold/hot compression, 50 MPa, thickness decrease | 5 % at 23 °C; 35 % at 260 °C |
| Tightness, DIN 28090-2 | 0.02 mg/(s x m) |
| Specific leak rate, VDI 2440 | 8.75E-07 mbar x l/(s x m) |
| Thickness / weight increase after immersion (percent): 100 % H2SO4 18 h at 23 °C; 100 % HNO3 18 h at 23 °C; 33 % NaOH 72 h at 110 °C | 1 / 1 (H2SO4); 1 / 2 (HNO3); no value printed (NaOH) |
| Density | 2.2 g/cm3 |
| Thermal conductivity | 0.42 W/mK |
| ASME code sealing factors, 2.0 mm, tightness class 0.1 mg/(s x m) | y 12 MPa, m 2.8 |
| Chemical resistance chart in datasheet | A (small or no attack) in all twelve media groups printed on the chart |
All values are typical values for a 2.0 mm sheet as printed in the Klinger datasheet; other thicknesses can differ.
Where top-chem 2005 sits in the PTFE line
Mechanically the sheet is firm: 4 % compressibility, 40 % recovery, y 12 MPa and m 2.8, with a tightness of 0.02 mg/(s x m) and a specific leak rate of 8.75E-07 mbar x l/(s x m), the lowest leak rate printed for the PTFE grades. Thickness decrease under 50 MPa is 5 % at 23 °C and 35 % at 260 °C, which is a clear step above top-chem 2000 and a reminder to keep temperature moderate.
Immersion in 100 % sulfuric and nitric acid produced 1 % thickness change and 1 to 2 % weight change; no value is printed for caustic soda, so choose top-chem 2006 for strongly alkaline media. Approvals include DIN-DVGW, WRAS, DNV, TA-Luft, FDA conformity of components, Regulation (EU) 1935/2004 and VDI 2200 blowout.
Related KLINGER gasket sheets
Choose between the PTFE sheets below mainly by medium, as each filler suits a different chemistry.
| Model | Basis | Colour | Positioning printed by Klinger |
|---|---|---|---|
| KLINGER top-chem 2000 | PTFE filled with silicon carbide | Grey | Heavy-duty, high mechanical load at high temperature |
| KLINGER top-chem 2003 | PTFE filled with hollow glass microspheres | Blue | Sealing at low surface load; acids and alkalis |
| KLINGER top-chem 2006 | PTFE filled with barium sulfate | White | Strongly alkaline media; pigment-free |
| KLINGER Quantum | Fibre and filler compound, HNBR | White | Flexibility at high temperature; FDA conformity |
Documents, ordering details and quotation
Include acid type and concentration, because the datasheet gives no caustic value for this grade. For a firm quotation please give the medium, pressure, temperature, flange details, bolt load available, thickness and quantity, and say if you need whole sheets or finished gaskets. As Klinger itself points out, the printed data cannot cover every installation, so have the final choice reviewed against the actual operating conditions. More products are shown in gaskets, seals and pipe fittings.
Datasheets & Documents
- Datasheet KLINGER top-chem 2005 datasheet, January 2026 Download
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About brand
KLINGER is the Austrian sealing and valve group behind the KLINGERSIL fibre gasket sheets and the top-chem PTFE sheets. Richard Klinger founded the company in Vienna in 1886, and its headquarters is in Gumpoldskirchen, Austria. In 1898 he developed Klingerit, a fibre-reinforced gasket material, and in 1982 KLINGERSIL replaced asbestos with aramid fibres.
Seven Star LLC is an independent supplier in Muscat. We list KLINGER gasket sheets in fibre, graphite and PTFE grades, and supply them to refineries, plants and fabricators in Oman and the GCC by grade, thickness and sheet size.
KLINGER at a glance
| Established | 1886, Vienna, Austria, by Richard Klinger; headquarters in Gumpoldskirchen |
|---|---|
| Milestones | Reflex water level gauge in the 1880s and 1890s; Klingerit fibre-reinforced gasket in 1898; asbestos-free KLINGERSIL in 1982 |
| Product families | Compressed fibre gasket sheets, PTFE sheets, graphite sheets, cut gaskets, valves and level gauges |
| Applications | Flanged joints on steam, water, oil, gas, chemical and acid lines |
KLINGER gasket sheets we list
| Grade | Material | Typical use |
|---|---|---|
| KLINGERSIL C-4400, C-4300 | Aramid fibre, NBR binder | General service: water, steam, oils, fuels and gases |
| KLINGERSIL C-4324, C-4430 | Synthetic fibre, NBR binder | Water, steam, oils and gases; grade checked against the pT diagram for the duty |
| KLINGERSIL C-4500 | Carbon fibre, NBR binder | Hot oil, heat transfer fluids and alkaline media |
| top-graph 2000 | Graphite fibre, NBR binder | High temperature service with good sealing under lower bolt loads |
| Quantum | Fibre sheet, HNBR binder | High temperature service where NBR-bound sheets age too fast |
| top-chem 2000, 2003, 2005 | Filled PTFE | Acids, alkalis, solvents and other aggressive chemicals |
The gasket grade is chosen from the medium, the temperature, the pressure and the flange. Fibre sheets with an NBR binder cover most utility and hydrocarbon service. HNBR and graphite grades move the temperature limit up. Filled PTFE sheets handle strong chemicals, with the filler (silicon carbide, glass microspheres or another acid-resistant filler) setting creep resistance and chemical range. Thinner gaskets generally seal better under the same bolt load.
Where KLINGER gaskets are used
In Oman and the GCC, KLINGER sheets and cut gaskets seal flanges in refineries, gas plants, petrochemical and fertiliser plants, power and desalination stations, and steam and water systems in industry and buildings.
Ordering KLINGER sheets and gaskets: what we need
Send the grade, thickness (for example 1.5, 2 or 3 mm) and sheet size, or for cut gaskets the flange standard, size and pressure class. For a new duty, send the medium, the temperature and the pressure so the grade can be checked against KLINGER's pT diagram.
Facts checked against KLINGER company history, October 2026.
Browse Klinger products by category: Pipes & Fittings.
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Frequently Asked Questions
What is the filler in top-chem 2005?
Inorganic fillers in PTFE; the sheet is red.
Which media is it meant for?
Strongly acidic applications in the chemical industry, per Klinger.
What are the ASME factors?
y = 12 MPa and m = 2.8 for a 2.0 mm gasket at tightness class 0.1 mg/(s x m).
Is a caustic soda value given?
No. The datasheet shows no immersion value for NaOH; Klinger recommends top-chem 2006 for strong alkalis.
Which sheet size is listed?
1500 x 1500 mm, in thicknesses of 1.0, 1.5, 2.0 and 3.0 mm.
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