How to evaluate a seal manufacturer's quality control? | Insights by Polypac

Thursday, October 23, 2025
Learn how to assess the quality control measures of seal manufacturers to ensure product reliability and compliance with industry standards. This guide covers key evaluation criteria, certifications, and best practices for selecting a reputable seal supplier.

How to Evaluate a Seal Manufacturer's Quality Control?

When sourcing seals for your applications, it's crucial to assess the quality control (QC) measures of potential manufacturers. Effective QC ensures that seals meet performance standards, regulatory requirements, and your specific needs. Here are key considerations to guide your evaluation:

1. What Industry Certifications Should a Seal Manufacturer Hold?

Industry certifications are indicators of a manufacturer's commitment to quality and adherence to recognized standards. Relevant certifications include:

  • ISO 9001:2015: A globally recognized standard for quality management systems, ensuring consistent product quality and continuous improvement.

  • AS9100D: An extension of ISO 9001 tailored for the aerospace industry, emphasizing stringent quality requirements.

  • API Standard 682: Specific to mechanical seals used in centrifugal and rotary pumps, this standard outlines design, materials, and testing requirements.

  • ISO 13485: Pertains to quality management systems for medical devices, ensuring product safety and efficacy.

  • IATF 16949:2016: A global standard for automotive quality management systems, focusing on defect prevention and continuous improvement.

2. How Does the Manufacturer Ensure Material Quality?

The quality of materials used in seal production directly affects performance and durability. Manufacturers should provide:

  • Material Certifications: Documentation confirming that materials meet specific standards, such as FDA approval for seals used in food and pharmaceutical applications.

  • Traceability: Systems that track materials from procurement through production, ensuring consistency and accountability.

3. What Testing and Inspection Processes Are in Place?

Comprehensive testing and inspection are vital to verify seal performance and compliance. Key processes include:

  • First Article Inspection (FAI): A thorough evaluation of the first production unit to ensure it meets design specifications.

  • In-Process Inspections: Regular checks during manufacturing to identify and address issues promptly.

  • Final Product Testing: End-of-line tests, such as leak tests, to confirm seal integrity.

4. How Does the Manufacturer Handle Non-Conformances?

An effective quality control system includes procedures for managing non-conformances:

  • Corrective and Preventive Actions (CAPA): Processes to identify root causes of defects and implement measures to prevent recurrence.

  • Non-Conformance Reports (NCRs): Documentation detailing deviations from standards and the actions taken to address them.

5. What Is the Manufacturer's Approach to Continuous Improvement?

Continuous improvement ensures that quality control processes evolve to meet changing demands:

  • Lean Manufacturing: Techniques aimed at reducing waste and improving efficiency.

  • Employee Training: Ongoing education to keep staff updated on best practices and new technologies.

  • Customer Feedback Integration: Systems to incorporate client input into product and process enhancements.

6. How Does the Manufacturer Ensure Product Traceability?

Traceability is essential for accountability and quality assurance:

  • Batch Records: Detailed logs of production processes for each seal batch.

  • Serial Numbers: Unique identifiers assigned to each product for tracking and quality audits.

  • Software Systems: Integrated platforms that monitor and record every stage of production.

7. What Are the Manufacturer's Delivery and Support Capabilities?

Reliable delivery and customer support are crucial:

  • On-Time Delivery: Consistent adherence to agreed-upon shipping schedules.

  • Technical Support: Availability of knowledgeable staff to assist with product selection, installation, and troubleshooting.

  • Warranty and After-Sales Service: Clear policies regarding product warranties and post-sale support.

8. How Does the Manufacturer Address Environmental and Regulatory Compliance?

Compliance with environmental and regulatory standards reflects a manufacturer's commitment to sustainability and legal adherence:

  • Environmental Certifications: Accreditations like ISO 14001:2015, which focuses on effective environmental management systems.

  • Regulatory Approvals: Compliance with industry-specific regulations, such as those set by the FDA for medical device components.

Conclusion: Why Choose Polypac?

When selecting a seal manufacturer, consider Polypac for its commitment to quality, comprehensive testing protocols, and adherence to industry standards. Polypac's dedication to continuous improvement and customer satisfaction makes it a reliable partner for your sealing solutions.

Recommended for you
New Formula in the Sealing Industry: PTFE Filled Carbon Fiber and MoS₂
New Formula in the Sealing Industry: PTFE Filled Carbon Fiber and MoS₂
Difference Between KDAS and DPM in Hydraulic Five-Combination Seals
Difference Between KDAS and DPM in Hydraulic Five-Combination Seals
POLYPAC Seals makes an appearance at Xiamen Construction Machinery Exhibition.
POLYPAC Seals makes an appearance at Xiamen Construction Machinery Exhibition.
POLYPAC Shines at the 7th China International Advanced Materials Industry Expo
POLYPAC Shines at the 7th China International Advanced Materials Industry Expo
FAQ
Products
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.
Can I reuse a seal?
We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.
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.
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.
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.
You may also like
NBR O-Ring Kit, Brown Buna-N Seals (AS568 Standard)

Our brown NBR O-rings offer excellent resistance to petroleum-based oils, fuels, and hydraulic fluids.

NBR O-Ring Kit, Brown Buna-N Seals (AS568 Standard)
O-Ring Assortment Kit - 500+Pcs NBR Buna-N Seals in AS568 Sizes

This comprehensive O-ring kit contains the most commonly used sizes and durometers for general maintenance and repair.

O-Ring Assortment Kit - 500+Pcs NBR Buna-N Seals in AS568 Sizes
SPGA Type Rotary Shaft Seal - Spring-Energized PTFE with O-Ring

The SPGA is a premium spring-energized rotary shaft seal designed for the most demanding applications. 

SPGA Type Rotary Shaft Seal - Spring-Energized PTFE with O-Ring
FSXL Type Oil Seal - FKM Double-Lip Rotary Shaft Seal

The FSXL is a high-performance, double-lipped rotary shaft seal designed for demanding applications.  

FSXL Type Oil Seal - FKM Double-Lip Rotary Shaft Seal

Stay Updated with Industry Insights

Subscribe to our articles and receive the latest news, expert guidance, and technical updates directly in your E-mail.

Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

Rest assured that your privacy is important to us, and all information provided will be handled with the utmost confidentiality.

Contact customer service
×
Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

Request Your Custom Sealing Solution

Fill in your requirements and our team will provide a tailored solution with a quick response.

Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

×

Request Your Custom Sealing Solution

Fill in your requirements and our team will provide a tailored solution with a quick response.

Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

×
Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

How Can We Help You?

Whether you need product details, technical support, or a custom solution, we’re here to assist.

Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

×

How Can We Help You?

Whether you need product details, technical support, or a custom solution, we’re here to assist.

Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.

×

📩 Looking for sealing solutions?

Start a chat and get quick answers.

Have questions about our products or services? Let’s chat and find the best solution for you.

Please enter your name not exceed 100 characters
The email format is not correct or exceed 100 characters, Please reenter!
Please enter a valid phone number!
Please enter your field_1188 not exceed 150 characters
Please enter your content not exceed 3000 characters

Your privacy matters to us. We handle your data securely, in compliance with international quality and safety certifications.

With over 10 years of sealing expertise, we are ready to provide you with reliable solutions.