Polypac Food Grade NBR O-ring Kit

Polypac Food Grade NBR O-ring Kit provides food-safe, durable seals in a complete assortment of sizes. Excellent oil and wear resistance, low compression set, and custom options from an experienced seal manufacturer.

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Product Description

Polypac Food Grade NBR O-ring Kit

Polypac Food Grade NBR O-ring Kit offers reliable, food-safe sealing solutions for the food, beverage, and pharmaceutical industries. Each kit contains a wide range of NBR (nitrile) O-ring sizes made from food-grade compounds formulated for safe contact with food processing environments. Designed for durability, flexibility, and easy installation, this kit helps reduce downtime and improves equipment reliability.

Key Features

Food-grade NBR compound designed to meet common food contact requirements.
Wide assortment of sizes for pumps, valves, fittings, and equipment maintenance.
Strong oil and grease resistance suitable for food processing lubricants and hydraulic fluids.
Low compression set and high elasticity for long-lasting sealing performance.
Good wear and abrasion resistance for extended service life.
Easy to install and compatible with common sealing grooves and housings.

Benefits

Polypac’s NBR O-ring kit simplifies maintenance and spare-part management. By stocking a full range of food-grade O-rings, maintenance teams can respond quickly to leaks and wear, minimizing production interruptions. The NBR formulation balances resilience and resistance to oils and mechanical wear, delivering stable sealing under typical food-processing temperatures and pressures.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with extensive experience in seal production and sealing material development. Our factory spans more than 10,000 square meters with 8,000 square meters of production space and advanced manufacturing and testing equipment. Since 2008, we have expanded from PTFE products to a full range of O-rings in NBR, FKM, silicone, EPDM, and FFKM. We offer custom sizes and materials for special working conditions and maintain strong R&D ties with universities and research institutes.

Applications & Ordering

Ideal for food and beverage processing, dairy, bottling, and related machinery. Choose standard kits for general maintenance or request custom O-rings for specific equipment. Contact Polypac for samples, technical support, and bulk pricing to ensure your operation stays sealed and productive.

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Q&A

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

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.

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