Innovation, emerging technology, and several new material options are encouraging fluid power industry OEMs and cylinder builders to take a fresh look at a trustworthy and tested old friend— the polyurethane (PU) O-Ring. Known for their durability, resilience, and adaptability, PU O-rings have found their rightful place in hydraulics, where static seals are pivotal in preventing leakage between connecting components in fluid power systems, more specifically between connecting rods and piston heads, and cylinder tubes and glands. Often considered secondary to dynamic seals, these seals are instrumental in maintaining pressure where it matters most.

The polyurethane O-Ring typically provides sealing between a gland and a cylinder bore or a rod and a piston. However, understanding the PU O-Ring’s complexities, particularly in medium and heavy-duty technical applications, is not straightforward in today’s multifaceted industrial environment. It requires advanced manufacturing, technology expertise, and proven processes for managing the changing landscape regarding multiple material options.

Here are five facts to remember when considering the Hallite 003 PU O-Ring for your next hydraulic cylinder application.

  1. It is a singular solution and an efficient alternative to a traditional two-piece elastomer O-ring and backup combination. The Hallite 003 PU O-Ring can be standardized to a configuration commonly addressed with different components, making it capable of delivering across all duty cycles and a wide range of pressure requirements.
  2. It is a compact solution for static applications when the space for a seal in the cylinder is limited. Since it can fit in traditional and industry-normal O-ring grooves, the overall sizing of glands and pistons can be reduced.
  3. Due to fewer components, it offers less risk of assembly errors, concerns, and risk if incorrectly orientated.
  4. Fewer components also require less purchase and stock handling.
  5. Its Hythane material offers both resilience and extrusion resistance, eliminating the need for additional anti-extrusion back-up rings. Hythane 591 high-performance polyurethane, ensures effortless installation and reliable high pressure sealing. For more demanding low-temperature conditions, alternative material options, such as Hythane 181, are available.

Cylinder builders can rely on the 003 PU O-Ring to reach performances of up to 500BAR in a singular solution, simplifying the design process with fewer components. High tensile strength allows the O-Ring to withstand high pressure and shock loads. Notably, the PU O-Ring enables Hallite to provide a complete static sealing solution today with endless potential as we collaborate with customers to explore additional use applications, such as valves and hydrogen.

Contact your local Hallite technical team to learn more about this product and any custom material alternatives that suit your application.