Max H-PUR raw-material for seal making

MAX H-PUR polyurethane sealing solutions

Explore our Max H-Pur polyurethane bushings and sealing materials, meticulously developed from a blend of high-grade chemical elements to surpass the evolving technical specifications in the sealing industry.

Our Max H-Pur range is tailored for superior mechanical and tribological performance, resistance to chemicals, hydrolysis, and exceptional thermal stability up to +150°C. These materials are characterized by their high tensile strength, superior wear resistance, low hysteresis, and remain flexible in low temperatures down to -25°C while maintaining a low compression set. The formula is enriched with specialized polymeric lubricants, enhancing self-lubrication, significantly reducing friction (µ < 0.2), and preventing the stick-slip effect, thereby offering better results than polyurethanes with solid lubricants like MoS2.

Max H-Pur sealing materials are ideal for a variety of demanding applications including oil hydraulic systems, subsea and natural water settings at elevated temperatures, sanitation processes within the food and beverage industry, handling of sour oils and gases in the oil and gas field, usage with flame retardant hydraulic fluids (HFA- HFB fluids in mining cylinders and hydraulic presses), and compatibility with biodegradable fluids such as vegetable oils and synthetic esters. Available in a spectrum of colors like red, green, blue, turquoise, natural, and dark grey, Max H-Pur is a staple for precision lathe-cut sealing.

Additionally, our red, blue, and natural hues of Max H-Pur meet the stringent FDA CFR 177.2600 standards for food contact, ensuring safety and compliance for food-grade applications.


Max H-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 H-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 – red, green, blue, turquoise, natural and dark grey – commonly used in the lathe-cut sealing industry.

Max H-Pur in red, blue and natural colour comply with the FDA CFR 177.2600 food standard.
It is made available in different colors:
Dark Grey
– commonly used in the lathe-cut sealing industry.Max H-Pur in red, blue and natural colour comply with the FDA CFR 177.2600 food standard.

Max H-Pur is approved by KTW and corresponds to FDA

In comparison with Pur, Max H-Pur has about the same mechanical properties and wear resistance. Breaking strain is very low (10% at 70°C/24h). The temperature rate: from -20°C up to +150°C.

The main difference between Max H-Pur and Pur, is a very high hydrolysis and chemical resistance of Max H-Pur, which is very unusual for polyurethanes.

Resistance Max H-PUR material

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


Max H-Pur is mainly used in those cases where among with the high resistance to mineral oils, hydrolysis and chemical resistance are required.
Operating practice of different seals shows that Max H-Pur has better wear resistance than the rubber elastomers (standard molding to a press-form) more than 8-15 times.
Max H-Pur has high hardness, so it has been used successfully for the seals, which are operated in a highly worn pairings at high pressure and must have a high resistance to extrusion.
There is a Certificate confirming Max H-Pur to be intended as a sealing material for the use in food processing machinery is in full compliance with FDA regulations.

Mainly used

  • Wipers
  • Piston seals
  • Rod seals
  • O-Rings
  • Rotor seals

Max H-Pur Material Data Sheet

Hardness at 20°:
95 +/-3
Shore A
DIN 53505
Hardness at 20°:
45 +/-3
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
Coefficient of friction (dyn.):
ASTM D1894
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.