Custom Seals For Overseas Buyers: RFQ Checklist
2026-08-17
For overseas buyers, a complete RFQ package can reduce communication time and make custom seal projects easier to evaluate.
DEF Seals is located in Dongguan, Guangdong, China, and integrates production, R&D, and sales. The company supports drawing-based customization, sample-based customization, small-batch sampling, and material selection communication for different sealing applications.
When requesting a quotation for custom seals, the following information can help manufacturers understand the project more accurately.
1. Drawings, Samples, or Existing Part Information
A technical drawing is one of the most useful references for a custom seal inquiry. If a drawing is not available, buyers can provide:
- Existing seal samples
- Product photos
- Installation photos
- Basic dimensions
- Part numbers or previous supplier information
For sample-based projects, an existing seal can help the manufacturer review the structure and develop a suitable replacement or customized solution.
2. Dimensions and Material Requirements
Basic dimensional information should include the seal size and, when available, groove or installation dimensions.
Buyers should also specify the required material. Common sealing materials include PTFE, PU, NBR, FKM, EPDM, HNBR, PEEK, and other engineering materials.
If the exact material is uncertain, provide the working conditions instead. The manufacturer can then discuss material selection based on the application.
3. Quantity and Application Conditions
Quantity is important for both quotation and production planning. Buyers should provide the estimated order quantity and indicate whether the project involves:
- Prototype or sample testing
- Small-batch production
- Regular batch production
- Long-term supply
Application conditions are equally important. Useful information includes the working medium, pressure, temperature, movement type, and operating frequency.
For example, a seal used for hydraulic oil under reciprocating motion may require a different material and profile from a seal used in a high-temperature rotary application.
4. Equipment and Industry Application
Tell the manufacturer where the seal will be used.
Relevant information may include the equipment type, component name, industry, and installation position. Applications can range from hydraulic cylinders and construction machinery to automation equipment, energy systems, chemical equipment, and other industrial machinery.
This information helps connect the seal design and material with actual operating conditions rather than evaluating the seal only by dimensions.
5. Packaging and Delivery Requirements
For overseas orders, packaging and delivery requirements should be discussed before production.
Buyers can specify:
- Individual or bulk packaging
- Labeling requirements
- Carton or pallet requirements
- Shipping destination
- Preferred shipping method
- Required delivery date
For DEF Seals, export samples usually take around 5–7 days, while regular production is usually around 7–12 days, subject to project confirmation and production requirements.
6. A Simple Custom Seal RFQ Checklist
Before sending an inquiry, overseas buyers can prepare:
- Drawing or seal sample
- Product photos or existing part information
- Seal dimensions and groove dimensions
- Material requirements
- Required quantity
- Working medium
- Working pressure
- Working temperature
- Movement type and operating conditions
- quipment and industry application
- Packaging requirements
- Shipping destination and delivery requirements
The more complete the RFQ information is, the easier it is for a custom seals manufacturer to evaluate the project and provide relevant feedback.
Custom Seals Manufacturer in China
DEF Seals is a sealing manufacturer in Dongguan, Guangdong, China, with more than 20 years of experience in sealing products. The company has professional R&D and production teams and provides one-stop sealing system solutions for industrial customers.
For overseas buyers, DEF Seals supports customized seals based on drawings or samples and can communicate on seal structure, material selection, sampling, production, and delivery requirements.
Email: defseals@defseals.com
WhatsApp: +86 13553832940
Foreign Trade Hotline: 0769-82224518
A clear RFQ is a practical starting point for efficient communication and a smoother custom seal project.
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Contact Us
Add：Dinghao Automatic Incubation Park, South China Industrial Park, Liaobu Town, Dongguan City, Guangdong Province
Zip: 523410
Fax：0769-83260340
Email：defseals@defseals.com