◉    Background

The NG part provided by the customer is a flange plate made of polyoxymethylene, which is white before processing, but after normal processing, a certain percentage of the product has a partial yellowing phenomenon.

Diagnostic analysis: uneven local heating leads to overheating of the failure part and yellowing.

◉    Suggestions for Improvement

1. Improving the injection molding process to ensure the temperature uniformity of each part;

2. Under the premise of ensuring quality, appropriately lowering the temperature and reducing the amount of stabilizer added.

◉    Service Content

Ⅰ. CTI uses comprehensive diversified analysis and testing methods to analyze the main failure causes for you:

1. Design a failure analysis plan based on the characteristics and failure characteristics of the product.

2. Comprehensive analysis, including but not limited to morphology analysis, physical property analysis, component analysis and reproducibility test, etc.

3. Comprehensive comparison and analysis of failed products and qualified products, infer the most likely cause of failure or eliminate factors that affect failure.

4. Provide suggestions for improvement to reduce or avoid the recurrence of failures.

Ⅱ. Common failure modes and causes
Discoloration failure (photochromic, electrochromic, thermochromic, aging discoloration); Fracture failure (brittle fracture, ductile fracture);

Delamination failure (moisture, corrosion, popcorn effect, thermal stress, passivation layer defects, plastic forming defects, die attach defects);

Corrosion failure (chemical cracking, swelling and dissolution, stress corrosion cracking, penetration failure);

Crack failure (orientation residual internal stress, cooling residual internal stress, environmental stress);

Wear failure (sliding wear, abrasive wear, erosion wear);

Frost spray failure (accelerator and antioxidant spray, sulfur spray, filler spray, softener, plasticizer, lubricant spray);

Foaming failure (vapor pressure, osmotic pressure, chemical reaction, residual gas in the substrate, residual solvent in the paint, poor adhesion of the primer).

Ⅲ. Failure Analysis Object

Plastics, rubber, adhesives, natural latex, composite materials, coatings, oils, etc.

General flow of failure analysis workflow

◉    Advantages

1. We focus on your needs and solve your problems purposefully and systematically.

2. Led by experienced professors, the CTI team can quickly judge and analyze various failure types.

3. We can provide enterprises with multi-directional services and provide clear directions and suggestions for material improvement.

◉    Service Process