dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac Diaphragm Seal Solutions for Precision Hydraulic Sealing

Diaphragm Seal Solutions by Polypac

Polypac specializes in engineered Diaphragm Seal products designed to protect instruments and systems from aggressive fluids, pressure fluctuations and harsh environments. Combining advanced materials and precision manufacturing, our diaphragm seals extend instrument life and ensure measurement accuracy across demanding hydraulic and process applications.

Performance & Materials

Our diaphragm seals are available in a wide range of elastomers and polymers including PTFE variants (bronze-filled, carbon-filled, graphite, MoS₂, glass-filled PTFE), NBR, FKM, silicone, EPDM and FFKM. Material selection is optimized for chemical compatibility, temperature range and mechanical resilience—ensuring a reliable interface between process media and sensing elements.

Custom Manufacturing & Scale

Polypac’s custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space and industry-leading production and testing equipment. Since 2008 we’ve evolved from specialty filled PTFE seals to a full portfolio of diaphragm seals and custom sealing solutions tailored for special working conditions.

Design Flexibility & Applications

We design diaphragm seals for pressure gauges, transmitters and differential instruments in industries such as hydraulics, petrochemical, pharmaceutical, food processing and power generation. Custom geometries, flange styles and compound formulations are available to meet space, hygiene and pressure requirements.

Quality, Testing & Collaboration

Polypac maintains rigorous quality control and collaborates with universities and research institutions to advance sealing technology. Our testing capabilities verify leak tightness, pressure endurance and material aging to deliver durable diaphragm seals you can trust.

Why Choose Polypac?

Reliable performance, comprehensive material expertise and full-scale customization make Polypac the preferred partner for diaphragm seals. Whether you need off-the-shelf reliability or a bespoke sealing solution for extreme conditions, our experienced team delivers precision, durability and measurable ROI.

Diaphragm Seal Display

FAQ:

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

Table of Contents

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Diaphragm Seal Solutions by Polypac
Performance & Materials
Custom Manufacturing & Scale
Design Flexibility & Applications
Quality, Testing & Collaboration
Why Choose Polypac?
Diaphragm Seal Display

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