Color – dark red
XH-Pur is a hydrolysis resistant hard grade thermoplastic polyurethane elastomer (TPU). This material is the further development and modernising of popular material H-Pur, it still perfectly works in hot water (natural and sea) based, flame retardant hydraulic fluids (HFA, HFB), biologically degradable fluids (bio-oils), mineral oils, but has much bigger hardness, therefore it can be used in heavier conditions.
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
| 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 | Ethanol | 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 | – | – |
Application
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
XH-Pur Material Data Sheet
| Properties | Value | Unit | Standard |
| Hardness | 57+/-2 | Sh D | DIN 53505 |
| Density | 1,2 | g/cm3 | DIN 53479 or DIN EN ISO 1183-1 |
| Compression set 70°C / 70 h, 20 % deformation | 25 | % | DIN 53517 or DIN ISO 815-1 |
| Compression set 100°C / 24 h, 20 % deformation | 30 | % | DIN 53517 or DIN ISO 815-1 |
| 100 % modulus | 23 | N/mm2 | DIN 53504 |
| Tensile strength | ≥45 | N/mm2 | DIN 53504 |
| Elongation at break | ≥300 | % | DIN 53504 |
| Tear strength | ≥100 | N/mm | DIN 53515 or DIN ISO 34-1 |
| Abrasion | 18 | mm3 | DIN 53516 |
| Min. service temperature | -20 | °C | |
| Max. service temperature | +110 | °C |
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.
