How do I choose a reliable supplier of aluminum profiles?

To choose a reliable supplier of aluminum profiles, consider the following: Check their industry experience and reputation. Look for certifications and quality management systems like ISO standards. Evaluate their product quality by requesting samples and conducting tests. Assess their delivery times and reliability. Ensure they have a wide range of profiles to meet diverse needs. Investigate customer reviews and testimonials for insights into their service. Finally, consider the cost-effectiveness of their products without compromising on quality.