Color – yellow XH-PUR material

Max XH-Pur is a specially developed polyurethane system, scientifically formulated from a selection of highquality chemical components to meet the increasing technical demands in the sealing industry.

It has been optimised in terms of its mechanical and tribological properties, resistance to chemicals and hydrolysis and high temperature stability (+ 150°C). It has high tensile strength, very high wear resistance, low hysteresis, good flexibility at low temperatures (-25 °C) and a low compression-set.

Special polymeric lubricants added to the formula ensure superior sliding properties (self-lubrication), significantly reduce friction (µ < 0.2) and prevent the stick-slip effect, thereby exceeding the performance of polyurethanes filled with solid lubricants (MoS2).

Max XH-Pur shows excellent performance in oil hydraulic applications, in sub-sea and natural water applications at elevated temperatures, in cleaning processes in the food/beverage industry, in sour oils and gases in O&G industry, in flame retardant hydraulic fluids (HFA- HFB fluids in mining cylinders and hydr. presses), as well as in biological degradable fluids (vegetable oils and synthetic esters). It is made available in different colors – yellow and dark grey – commonly used in the lathe-cut sealing industry.

Due to its excellent extrusion resistance, allowing larger sealing gaps at higher application temperatures, superior sliding properties and reduced stick-slip it is mainly used for elastomer energized composite seals.

High hardness of a material promotes its excellent stability to extrusion

XH-Pur is highly resistant to ozone, weather impact and temperatures. As well as H-Pur, this material is very recommended for usage in tropical regions. Swelling in mineral oils is low. XH-Pur has the same high resistance to radiation exposure and gas permeability as H-Pur. 

Resistance XH-PUR elastomer

Good resistance
Average resistance
Low resistance
Hydraulic fluids based on mineral oil
Fire-resistant fluids of type HFC (water glycol mixture)
Aromatic hydrocarbons
Biologically degradable hydraulic fluids
Some additives for power can have destructive effect (e.g. fungicides)
Chlorinated hydrocarbons (dichloromethane, trichloromethane)
Fire-resistant pressure fluids HFA and HFB
Ketones and glycols
Mineral oils and grease (certain additives can have destructive effects)
Non-ethanol fuels (except premium blend petrol and unleaded fuels)
Break fluids, based on glycol
Silicone oils and grease
Hot steam exceeding +100°С
Aliphatic hydrocarbons (e.g. propane, butane)
Concentrated acids and basis
Hot water and sea water up to +90°С
Diluted acids and basis


XH-Pur is used as alternative to material PTFE in the combined sealing systems, consisting of two elements – a sliding ring (PTFE) and elastic O-Ring (NBR). The sliding ring out of XH-Pur, unlike PTFE, can be installed easily and quickly without application of special instruments and techniques.
XH-Pur with heightened hardness has excellent extrusion stability and can be used as a material for the seals fixed in strongly worn out gears and at very high pressure

Mainly used

  • Wipers
  • Piston seals
  • Rod seals
  • O-Rings
  • Rotor seals
Max XH-Pur Material Data Sheet
Hardness at 20°:
Shore A
DIN 53505
Hardness at 20°:
56 +/-2
Shore D
DIN 53505
DIN ISO 1183-1
100% Modulus:
DIN 53504
300% Modulus:
DIN 53504
Tensile strength:
DIN 53504
Elongation at break:
DIN 53504
Rebound resilience:
DIN 53512
Tear strength:
DIN ISO 34-1
DIN 53516
Compression set:*
< /
ISO 815-1
Compression set:**
ISO 815-1
Compression set:***
ISO 815-1
Min. service temperature:
Max. service temperature (short term):
+150 (+165)
g Glass Transition Temp.:

*Compression set @ 70°C, 24 hours
**Compression set @ 100°C, 24 hours
***Compression set @ 150°C, 24 hours

All above established data results from random tests which were taken from the functioning production. All data was stated based on standard test-products in accordance with ISO, DIN and ASTM standards and can substantially not be extended to the completed seal. Our practical technical recommendation, either oral, written or through tests is given in conformity with our best knowledge. However, this data is to be regarded as non-obligatory advice, also taking into consideration any protective rights of a third party, and does not acquit you from making tests with our product in relation to its adaptability for the assigned process and intendment. Utilization, application and processing of the products befall completely outside of our control and are therefore solely your liability. As regards the responsibility, it will be limited to all damages in the value of the product which we delivered and you applied. Certainly, we do assure the immaculate quality of our products in concordance with our general sales and delivery conditions.