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O-ring specification download

O-ring related information

Product Introduction

FFKM Comparison sheet

FFKM Comparison with other brands

■ What is KTseal ?123

  • KTseal , is the brand name for KTseal's perfluoroelastomer product range.

  • Dupont Dow Elastomers, Kalrez R and Greene, Tweed's Chemraz R are also perfluoroelastomers.

■ History of Perfluoroelastomers

■ Market Sectors:

■ Market Sectors:

■ Market Sectors:

■ Compression Set:


■ Compression Set:


■ Technical Comparison Hysteresis







■ Hysteresis:



■ V Rings

1970DuPont Dow Elastomers develop first perfluoroelastomer

■ Moulders not willing to purchase expensive polymer

■ DuPont Dow Elastomers develop own moulding capability

■ Kalrez becomes commercially available

1986Greene, Tweed develop Chemraz following lapse of initial patent

■ History of Perfluoroelastomers


■ Competition accelerates market growt

■ hOther companies dabble with no real impact

1995Bevelop own perfluoroelastomer offering technical and commercial benefits
2000Dedicated production facility set up in Hsinchu, Taiwan, to offer flexible manufacturing approach.

■Market Sectors:


  • Mechanical Seals

  • Pumps

  • Valves

  • Flanges

  • Mixers

  • Pipework

■ Static or limited dynamics (for O-rings)

■ Relatively low pressures (for O-rings)

■ Wide temperature range

■ Severe chemical duty

■ Oilfield

  • Downhole production equipment

  • Logging equipment

  • Chemical injection

■ Static and dynamic

■ Semiconductor

  • Wafer fabrication equipment

  • Chemical delivery systems

  • Pumps, valves, filters etc.

■ Mainly o-rings in non-standard grooves

■ Exotic acids and plasmas

■ High vacuum

■ Low contamination

■ Low outgassing

■ Print, Paint, and Coating Industries

  • Solvents

■ Aerospace

  • High Temperature

  • Rocket Propellants

Available Products

  • O-Rings

  • V-Rings

  • Fabric Reinforced Diaphragm

  • nflatable Seals

  • Bellows

  • Valve Stem Packings

  • Custom Moulded Geometries

  • Bonded Products

“Forsheda produce an elastomeric [KTseal] lipseal (V Ring). This will provide an answer to the “stationary clogging issue” and leverage the KTseal product line. ”

Note that the V Ring will run against the end of the inner gland plate which is hardened and lapped for this purpose.

Diaphragms (Under Development)

KTseal /FKM bonded diaphragms.Alternative to PTFE diaphragms for chemically challenging applicationsoffering:

  • Flexibility of elastomer

  • Chemical resistance of KTseal

  • Physical strength of FKM

  • Extended diaphragm life

  • Full pump performance

  • Reduced down time and maintenance costs

Inflatable Seals

  • PTFE cold flow

  • Particles imbedded into PTFE seal

  • Expensive hardware damaged

  • High levels of maintenance KTseal inflatable seals. Alternative to PTFE for chemically challenging applications offering:

  • Repeated inflations

  • Full retraction after inflation

  • Elimination of hardware damage

  • Reduced down time and maintenance costs

Materials Testing

  • Compression set

  • Hardness

  • Swell and volume change

  • Hysteresis

  • Elongation

  • Tensile strength

  • Tear strength

  • Specific gravity

  • Abrasion resistance

Applications Acids

 Temp.TimeKTsealComp Matl A
Hydrochloric Acid , 37%amb.70 h+ 0.2+ 0.8 (4079)
Hydrofluoric Acid, 60%104F168 h+ 0.63 + 0.5 (4079)
Phosphoric Acid, 85%248F70 h- 0.1- 0.1 (4079)
Sulfuric Acid, 98%248F70 h+1.03 +4.1 (4079)
Hydrofluoric Acid/HC115F
Adiptic Acid212F
Paratoluic Acic300F
Monochlorocetic Acid32F
Nitric Acid, 43%120-140F
Stearic Acid (Octadecandic Acid)185F
  • Laboratory Test Results (% Volume Swell)

  • Examples of KTaesl Applications