What is a polyurethane rod used for?

A polyurethane rod is used as a damping element that absorbs impacts and vibration and removes load from the metal components of machinery. Bushings, rollers, elastic supports, and stamping-press spring elements are also machined from it. Rods most commonly work in agricultural, mining, and heavy industrial equipment, where the node is subject to constant dynamic loading.

Does polyurethane damp vibration better than steel?

Yes. Polyurethane effectively absorbs vibration and impact energy through elastic deformation, whereas steel provides virtually no damping and transmits vibration to the structure. Replacing a steel element with polyurethane reduces noise and load on adjacent nodes, extending equipment life and reducing the need for shop noise insulation.

Which rod hardness should I choose for a damper?

For dampers and elastic supports, polyurethane in the range of approximately 80-95 Shore A is used: it absorbs impact well and returns to shape. For loaded bearing elements, a hardness in the Shore D range is more appropriate. Rods from 90 Shore A and above can also be machined. The optimal hardness is selected for the node load.

Can a polyurethane rod be machined?

Yes. Medium and high hardness rods (from 90 Shore A) are suitable for turning, cutting, drilling, and grinding. This allows the blank to be worked to the required shape or size for a specific node. For clean cutting, tooling must be sharp and feed rate moderate to avoid heat build-up and surface melting.

In what way is a polyurethane rod better than a rubber one?

A polyurethane rod wears several times more slowly: per DIN 53516 its abrasion is 38-39 mm³ versus 80-150 mm³ for nitrile rubber. It recovers shape better after compression, is oil-resistant, and works to -60 °C. As a result the damper node lasts longer and requires less frequent replacement than with a rubber element.

Buy a Polyurethane Damper Rod: Vibration Absorption in Agricultural and Heavy Equipment

A metal stop in agricultural equipment takes constant impact and vibration, destroys the seating and transmits the load further through the structure. A rubber damper in its place wears quickly and cracks from oil contact. A polyurethane rod operates differently in this node: it absorbs the impact, recovers its shape, and lasts several times longer than both alternatives. This article explains how a polyurethane damper rod replaces rubber and metal and how to order it to size.

What a Polyurethane Rod Is and Where It Works

A rod is a cast blank of cylindrical cross-section that functions as a damping or bearing element in nodes with dynamic loading. Its primary function is to absorb impacts and vibration: the rod is installed between moving parts of the mechanism and takes the load, removing it from the metal components. The operating principle is similar to a silent block, but the application range is wider.

Polyurethane rods most commonly work in agricultural and mining equipment, where nodes are subject to constant jolts and vibration from uneven ground and hard material. In heavy industry they are installed on machine tools, vibratory presses, and stamping equipment as elastic supports and buffers. The material retains elasticity in the range from -60 to +100 °C and is unaffected by technical lubricants, so it is suitable for outdoor operation and contact with working fluids.

Rods at 90 Shore A hardness and above are suitable for machining: they are turned, cut, drilled, and ground to specific geometry. This allows a part of the required shape to be machined from one blank for a non-standard node.

Comparison of Polyurethane Rod with Rubber and Steel

A damper rod replaces either a rubber element or a rigid metal stop in the node. The table compares polyurethane with NBR nitrile rubber and structural steel St3 on the properties that determine damper performance.

Property	Polyurethane TIMOL	NBR rubber	Steel St3
Abrasion DIN 53516, mm³	38-39	80-150	n/a
Operating temperature, °C	-60…+100	-30…+100	-40…+500
Tensile strength, MPa	39-87	10-25	370-700
Density, g/cm³	1.05-1.25	1.0-1.3	7.7-7.9
Vibration damping	excellent	good	poor
Oil resistance	excellent	good	high

The table shows why polyurethane occupies the advantageous middle ground between rubber and metal. Against rubber it wins on wear resistance (abrasion 38-39 vs 80-150 mm³) and tensile strength (39-87 vs 10-25 MPa), meaning it lasts longer and handles higher loads. Against steel, polyurethane yields on strength but damps vibration that metal does not attenuate at all, and weighs approximately seven times less: density 1.05-1.25 vs 7.7-7.9 g/cm³. For a damper node, it is impact absorption — not ultimate strength — that determines the service life of adjacent components.

Engineer’s tip: when selecting a rod for a damper, focus on working travel and load, not only on size. An overly hard element absorbs impact poorly and transmits it further; an overly soft one quickly settles and loses working height. For most buffers and elastic supports the optimal zone is 85-95 Shore A. Clean the seating pocket of burrs before installation to avoid the material being cut at sharp edges under load.

Advantages of Polyurethane in Damper Nodes

The primary advantage is the combination of wear resistance with damping capacity. Polyurethane damps vibration like rubber, but wears several times more slowly and handles higher loads. This directly affects the life of the whole node: the more consistently the damper absorbs impacts, the less load is transmitted to the metal components and the longer they last. Replacing a metal stop with polyurethane also reduces noise, since metal-to-metal generates rumble that the polymer quenches.

The material recovers its original shape after compression without permanent set, so the damper retains its working height throughout its service life. It is resistant to moisture, fungi, UV, and technical fluids, allowing the part to operate in harsh conditions without protection. The range of products in which polyurethane is used is in the factory catalogue.

Another practical advantage is repairability. A worn rod is easily replaced with a newly machined analogue without replacing the whole node. This is especially valuable for agricultural machinery operating seasonally at high pace: a damper is replaced in a few minutes and the machine returns to the field without extended downtime. With a sample of the old part available, a new rod is produced to the same dimensions, so there is no need to search for original manufacturer drawings.

Ordering Rods to Size

Rods at TIMOL factory are cast by the free-casting process, which produces a solid monolithic blank without seams or internal voids. For a damper element this is fundamental: voids and seams become stress concentrations at which the part fails under cyclic loading. The cast blank is uniform in cross-section throughout and withstands repeated compression.

Production is possible to a specific diameter, length, and hardness from a drawing or sample of the worn part. If parameters are unavailable, the technologist determines them based on the node load and working travel. The overall hardness range covers from 50 Shore A to 70 Shore D, accommodating both soft dampers and hard bearing elements. Further detail on the custom manufacturing service is in the services section.

How to Order a Polyurethane Rod from TIMOL Factory

Buy a polyurethane rod directly from the manufacturer in Dnipro, without intermediary markups. Direct contact with the factory allows hardness and blank size to be selected for the specific damper or bearing node, and if needed a finished part machined to size can be obtained.

To place an order, specify the rod diameter, length, and desired hardness, and describe the node’s operating conditions: equipment type, load, temperature regime. The technologist will recommend the polyurethane grade and prepare the blank or finished part. Contact the factory and get a consultation via the contacts page. Producing a rod for the task gives an exact damper fit and predictable node service life.