Industrial Rubber and Plastic Products · Global B2B Procurement and Customizationsales@longtowin.com · +86 152 1098 7119 · Multilingual communication
Hebei Longtowin Rubber & Plastic Products Co., Ltd.RUBBER / PLASTIC / GLOBAL SOURCING
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Technical Insights

Ask the key questions first, and then start the inquiry

Material selection, specifications and acceptance criteria determine whether rubber and plastic products are truly suitable. Here are practical judgment methods for procurement, engineering and maintenance teams.

Rubber and engineering plastic material selection samples

Featured Guide · 8 min read

Rubber seal material selection: from medium, temperature to failure mode

Seals of the same size may have completely different lifespans and costs with different material selections. Contact medium, continuous and peak temperature, pressure, movement mode and installation space should be confirmed before enquiring.

  • Don’t judge rubber material by color alone
  • Distinguish between long-term temperature and short-term peak value
  • Pay attention to compression permanent deformation and media swelling
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Quick Judgment Framework

M · T · P · M · C

Medium Media
Temperature Temperature
Pressure Pressure
Motion Sports
Compliance Compliance

Procurement Knowledge Base

Use more complete information in exchange for more reliable delivery

The following topics can be used as an inquiry checklist within the team or for communicating projects with us.

Material selection · 6 minutes

NBR, EPDM and FKM: How to choose between three commonly used rubbers

Start from oil, water, weather and chemical media, understand the advantages and limitations of materials, and avoid selecting materials based on price alone.

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Custom Procurement · 7 min

How to start customization of non-standard parts when there are no complete drawings

Sample surveying, key dimensions, assembly relationships and working condition information, which ones can be supplemented and which ones must be confirmed.

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Quality Management · 5 minutes

What items should be checked during shipping inspection of rubber and plastic parts?

How to stratify size, hardness, appearance, quantity, packaging and documents according to risk instead of blindly pursuing full inspection.

Understand the acceptance process →

Engineering Plastics · 6 minutes

Application differences of PA, POM, PTFE and UHMWPE

Compare wear resistance, water absorption, friction, temperature and processing stability to find a more matching engineering plastic.

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Cost Control · 4 min

In addition to the mold fee, what else affects the quotation of non-standard parts?

Quantity, material utilization, tolerances, post-processing and inspection requirements jointly determine the true procurement cost.

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International Trade · 5 minutes

Packaging and document list for cross-border procurement of rubber and plastic products

From labels, packing information to material documents, advance agreement can reduce rework in customs clearance and receiving.

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Purchase Memo

7 fields of a valid inquiry

  1. Product name, drawing or sample photo
  2. Material grade or specific usage conditions
  3. Critical Dimensions, Tolerances and Hardness
  4. Single quantity and estimated annual usage
  5. Applicable standards or certification requirements
  6. Packaging, labeling and documentation requirements
  7. Receiving location and expected delivery date

No complete technical information? We can sort it out together

Starting from the application description can also advance selection and quotation.

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