Choosing the right hydraulic seals is essential for maintaining pressure, preventing leaks, and extending the life of injection molding equipment. The following selections focus on common seal types used in hydraulic cylinders, piston seals, and related components in industrial molding environments. The list emphasizes material durability, temperature tolerance, and compatibility with oil-based hydraulic systems to support stable production and reduced downtime.
| Product | Brand | Key Benefit | Notes |
|---|---|---|---|
| YOKIVE 5 Pcs UN Radial Shaft Seals | YOKIVE | Oil-resistant PU seals for hydraulic cylinders | 25 mm ID x 33 mm OD; -35°C to 100°C |
| PDRMZ KDAS Combination Oil Seal (100 × 75 × 35.1) | PDRMZ | Wide-range inner diameter compatibility | PU/rubber seal set for KDAS configurations |
| PDRMZ KDAS Combination Oil Seal (230 × 205 × 50.8) | PDRMZ | Robust seal for large cylinders | PU/rubber construction; KDAS family |
| BlueDevil Hydraulic Stop Leak | BlueDevil Products | Restores dried and cracked seals | 32 oz bottle; pump, cylinder, valve compatibility |
| uxcell 25Pcs AS-218 O-Rings | uxcell | Nitrile rubber O-rings for seals | 1-1/4″ ID, 1-1/2″ OD; durometer 90 |
YOKIVE 5 Pcs UN Radial Shaft Seals
style=”margin:0; padding:0;”>YOKIVE UN Radial Shaft Seals Set
These PU oil seals are designed for hydraulic cylinders and related components in industrial settings. They feature oil resistance, wear resistance, and good low-temperature performance. The kit includes five seals with a 25 mm inner diameter, 33 mm outer diameter, and 5 mm width. Typical applications cover hydraulic cylinders, hoists, guide rods, and piston seals in static pressure environments. Operating temperature ranges from -35°C to 100°C, with a hardness around 90A, making them suitable for moderate to high-load conditions.
PDRMZ KDAS Combination Oil Seal (100 × 75 × 35.1)
style=”margin:0; padding:0;”>PDRMZ KDAS 100 × 75 × 35.1 Combination Seal
The KDAS combination oil seal from PDRMZ is suitable for injection molding machine hydraulic cylinders, offering a wide inner diameter range (22–360 mm) and a piston hole seal capability. Made from polyurethane and rubber, it emphasizes durability in hydraulic oil environments and is designed for multiple KDAS configurations. This product is described as part of a five-seal system, providing versatility for various KDAS piston-hole seal applications in molding equipment.
PDRMZ KDAS Combination Oil Seal (230 × 205 × 50.8)
style=”margin:0; padding:0;”>PDRMZ KDAS 230 × 205 × 50.8 Combination Seal
Designed for larger hydraulic cylinder applications in molding systems, this KDAS combination seal combines polyurethane and rubber components to handle higher inner diameters. It supports the KDAS five-seal configuration and is intended for hydraulic oil sealing, providing reliability in demanding production environments where larger piston strokes and seals are common.
BlueDevil Hydraulic Stop Leak – 32 oz
style=”margin:0; padding:0;”>BlueDevil Stop Leak For Hydraulic Systems
This product acts as a preventive additive to seal dried, cracked, or shrunken rubber seals within hydraulic systems. It is suitable for pumps, cylinders, and valves across various hydraulic configurations. It does not replace damaged seals but can help restore sealing efficiency and reduce ongoing leakage in older systems or assemblies that experience dynamic loading in injection molding environments.
uxcell 25Pcs AS-218 O-Rings
style=”margin:0; padding:0;”>uxcell AS-218 O-Rings, 25 Pcs
These nitrile rubber O-rings are designed for sealing joints in hydraulic and pneumatic systems. With a 1-1/4″ ID and 1-1/2″ OD and a 1/8″ width, the set provides consistent cross-section and a 90 durometer rating for reliable extrusion resistance. The material handles a wide operating range and is suitable for colder and hotter environments typical in injection molding equipment maintenance.
Buying Guide: Key Considerations for Injection Molding Seals
- Material compatibility: PU, nitrile rubber, and blended polymers are common. Check oil resistance, wear resistance, and temperature tolerance to match your hydraulic fluid and molding conditions.
- Seal geometry: Radial shaft seals, KDAS combinations, and O-rings serve different roles. Choose the geometry that aligns with cylinder diameter, piston stroke, and housing tolerances.
- Hardness and flexibility: A hardness around 90A to 95A often balances load-bearing capability with resilience. Consider lower hardness for high-speed, low-load applications and higher hardness for high-pressure scenarios.
- Temperature range: Injection molding environments can vary; select seals rated for the operational temperature window to prevent hardening or extrusion failures.
- Chemical compatibility: Ensure the hydraulic oil and any additives do not degrade the seal material over time. PU and NBR are common choices for mineral-based oils.
- Installation and maintenance: Quick-install designs and color-coded seals can reduce downtime. Keep spare seals in the correct sizes and verify dimensions before mounting.
- Cost vs. longevity: While inexpensive seals can reduce upfront costs, consider total cost of ownership including leak prevention, maintenance frequency, and downtime impact.
- System diagnostics: For aging lines, consider products like stop-leak additives as a supplementary measure, but rely on proper seals for primary integrity.