PPS Flat washer
PPS flat washer is a ring-shaped, non-metallic washer made from polyphenylene sulfide (PPS),High Heat, Chemical Inertness, and Dimensional Stability.
M Size: M3-M30
peek plastic material: Polyetherether ketone(PPS)
product type:Washers
color: Natural/Black/Other Colors(Customizable)
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PPS Flat washer Overview
PPS Flat Washer is an advanced, high-performance non-metallic washer made from Polyphenylene Sulfide (PPS). This semi-crystalline thermoplastic is specifically chosen for applications that require a robust combination of excellent high-temperature stability, broad chemical resistance, and exceptional dimensional accuracy.
Product Parameters
PPS Flat Washers typically adhere to established metric standards for plain washers, such as ISO 7089 (Non-chamfered) or ISO 7090 (Chamfered), with dimensions defined by the inner diameter (ID), outer diameter (OD), and thickness (T).
| Nominal Size (Bolt d) | Inner Diameter (ID) | Outer Diameter (OD) | Thickness (T) |
| M3 | 3.2 mm | 7.0 mm | 0.5 mm |
| M4 | 4.3 mm | 9.0 mm | 0.8 mm |
| M5 | 5.3 mm | 10.0 mm | 1.0 mm |
| M6 | 6.4 mm | 12.0 mm | 1.6 mm |
| M8 | 8.4 mm | 16.0 mm | 1.6 mm |
| M10 | 10.5 mm | 20.0 mm | 2.0 mm |
| M12 | 13.0 mm | 24.0 mm | 2.5 mm |
| M16 | 17.0 mm | 30.0 mm | 3.0 mm |
Key Features
The unique properties of Polyphenylene Sulfide define the performance of the PPS flat washer:
Exceptional Thermal Stability: PPS offers a very high continuous service temperature (up to 260°C or 392°C), making it suitable for many environments where high-end materials like PEEK are often specified.
Broad Chemical Resistance: PPS exhibits excellent resistance to a wide range of strong chemicals, including many solvents and acids, even at elevated temperatures.
Excellent Dimensional Stability: It maintains its shape and dimensions reliably under load and varying temperatures, with extremely low water absorption and minimal thermal expansion.
High Stiffness and Rigidity: PPS provides high stiffness and creep resistance, superior to most non-reinforced thermoplastics, allowing it to function reliably as a load-bearing surface, unlike the deformation seen in a flat rubber washer.
Electrical Isolation: It is inherently non-conductive, providing reliable dielectric strength and preventing galvanic corrosion.
Inherently Flame Retardant: PPS typically exhibits self-extinguishing properties without the need for additives.
Key Polypropylene (PP) Properties
Advantages vs Disadvantages
| Category | ✅ Advantages (Pros) | ❌ Disadvantages (Cons) |
| Thermal & Chemical | High Service Temperature: Operates reliably up to 200°C. Excellent Chemical Resistance: Withstands a broad range of aggressive industrial fluids. | Brittleness: Unfilled PPS can sometimes exhibit a slight tendency toward brittleness, especially at lower temperatures or when subjected to repeated impact. |
| Mechanical | High Rigidity: Excellent stiffness and low creep, superior to washer flat nylon. Dimensional Stability: Maintains size precisely under heat and moisture. | Cost: While less expensive than PEEK, PPS is significantly more costly than commodity plastics or standard metal washers. |
| Functionality | Inherent Flame Retardancy. Reliable electrical and thermal isolation. Compatible with lock washer and flat washer assemblies in non-metallic environments. | Sourcing: Not as readily available as common flat wash or stainless flat washer products, requiring sourcing from specialized distributors. |
| Comparison | Superior thermal and chemical resistance to flat washer nylon. Offers a cost-effective, high-heat alternative to PEEK. | Clamping Force: Still a polymer; high compression can lead to internal stress and potential failure, necessitating careful torque control. |
Applications
PPS Flat Washers are essential in demanding industrial sectors that require stable, non-metallic fastening solutions at high temperatures.
Automotive and Transportation: Used in engine compartments, transmission systems, and braking components where fasteners are exposed to sustained high heat, oil, and automotive fluids.
Industrial Processing: Employed in furnaces, drying ovens, and heat exchangers as insulators and spacers.
Chemical Processing: Used in equipment exposed to corrosive media at elevated temperatures where a stainless flat washer would still corrode or conduct heat.
Electronics and Appliances: Used in power supply components, electrical insulators, and heat-generating equipment due to its high dielectric strength and thermal rating.
General Fastening: Used in applications where dimensional stability is critical, such as securing optical or sensor equipment.
Packaging & Delivery
Standard packaging includes PE bag, foam cover, and one double-deck corrugated outer carton for safety during transit. Delivery time is 5-15 working days depending on the quantity.