O Ring for Palletizing Robot Gripper Cylinders HNBR NBR FKM PU FFKM Options

For palletizing robot gripper cylinders, O‑rings must withstand frequent
reciprocating motion, resist wear, tolerate oil exposure, and maintain
reliable sealing under high‑frequency operation. Selecting the right
material is essential for ensuring long‑term performance and system
stability. Below are several commonly used rubber materials and their
suitability for this type of application.

Hydrogenated Nitrile Rubber (HNBR)

HNBR is an upgraded version of standard nitrile rubber. It offers enhanced
resistance to oil, heat, and oxidation. Its excellent wear resistance makes
it particularly suitable for applications involving continuous reciprocating
motion, especially in high‑temperature or chemically aggressive
environments.

Typical Applications High‑temperature, oil‑rich, and chemically corrosive
environments.

Advantages

Strong wear resistance

Excellent heat and chemical resistance

Disadvantages

Higher cost compared with standard NBR

HNBR is ideal for applications requiring both high sealing performance and
durability, especially where frequent motion and elevated temperatures are
present.

Polyurethane (PU)

PU is known for its outstanding wear resistance and elasticity, making it a
strong candidate for high‑frequency reciprocating applications. It can
withstand prolonged friction and impact, and its hardness can be adjusted to
meet the needs of pneumatic and hydraulic systems.

Typical Applications Low‑ to medium‑temperature environments, particularly
where abrasion is a major concern.

Advantages

Exceptional wear resistance

Good elasticity

Suitable for high‑frequency motion

Disadvantages

Poor high‑temperature resistance and prone to aging under heat

If your cylinder experiences significant wear during frequent motion,
polyurethane is a highly suitable choice.

Nitrile Rubber (NBR)

NBR is one of the most widely used O‑ring materials. It provides good oil
resistance and moderate wear resistance, making it suitable for most
hydraulic and pneumatic systems involving lubricants, oils, and fuels.

Typical Applications General operating temperatures from −40°C to 125°C,
especially in oil‑based environments.

Advantages

Excellent cost‑performance ratio

Good oil and wear resistance

Disadvantages

Limited high‑temperature capability

For most non‑extreme working conditions, NBR offers a practical and
economical solution, especially for oil‑based sealing applications.

Fluorocarbon Rubber (FKM)

Compared with NBR, FKM provides superior heat and chemical resistance. It is
widely used in high‑temperature and corrosive environments where sealing
reliability is critical.

Typical Applications High‑temperature environments (up to 250°C) and
chemically aggressive conditions.

Advantages

Excellent heat resistance

Strong chemical resistance

Disadvantages

Higher cost

Poor low‑temperature flexibility

If your system frequently operates at elevated temperatures or comes into
contact with chemicals, FKM is a strong candidate.

Perfluoroelastomer (FFKM)

FFKM is one of the most advanced rubber materials available today. It can
withstand temperatures above 230°C for extended periods and resists nearly
all chemicals, including strong acids, strong bases, and organic solvents.
Its extremely low friction coefficient helps reduce wear during
reciprocating motion.

Typical Applications Extreme high‑temperature and highly corrosive
environments.

Advantages

Outstan , ding heat resistance

Exceptional chemical resistance

Low friction and reduced wear

Disadvantages

Very high cost

For the most demanding environments where sealing performance must remain
stable under extreme conditions, FFKM is the premium choice.

How to Choose the Right O‑Ring Material

When selecting an O‑ring material for a palletizing robot gripper cylinder,
consider the following factors:

Operating Temperature

High temperatures: FKM or FFKM

Low to moderate temperatures: NBR or PU

Oil Exposure

Oil‑rich environments: NBR or HNBR

Wear Resistance Requirements

High‑frequency reciprocating motion: PU or HNBR

In practical applications, NBR offers an economical solution for low‑ to
medium‑temperature oil environments. For higher heat and chemical
resistance, FKM and HNBR are more suitable. If wear resistance is the
priority, PU performs exceptionally well. In extreme conditions, FFKM
delivers unmatched performance, though at a significantly higher cost.

Selecting the right O‑ring material requires a balanced consideration of
temperature, oil exposure, wear resistance, and budget. Each material offers
unique advantages and is suited to specific working conditions. Making the
right choice will significantly enhance system stability and extend the
service life of the gripper cylinder.

Minimum Order: 1000 pieces

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