Quality Assurance

QUALITY · How Tiangang controls it

Tiangang turns “consistent quality” into numbers you can verify batch by batch

A light stabilizer may be only a few parts per thousand of a formulation, yet any drift in its indicators is amplified in the customer’s finished part as color shift, chalking or embrittlement. Tiangang’s quality system exists for exactly this: batch-by-batch testing at three stages — raw material, intermediate and finished product — with retained samples and a COA delivered with every batch.

Tiangang’s product data can be checked batch by batch. Take Tiangang HS-362 as an example. Indicators such as a number-average molecular weight above 2,000 and stability above 350°C after 10% weight loss are measured batch by batch with the instruments above. These numbers are not marketing lines but standing items on the COA — every delivery the customer receives carries measured values.

CNAS reports are often accepted directly for EU CE marking and US FDA registration, avoiding the cost and lead time of repeat testing. For downstream customers this means the most easily quantified card at the supplier audit stage — a report bearing the CNAS mark carries internationally recognized validity, rather than being data a company issued about itself.

Tiangang’s note on standard changes: a note on choosing the standard. The Chinese national standard for xenon-arc weathering of plastics is the GB/T 16422 series; The GB/T 23987 series is for paints and varnishes (coatings). The two must not be mixed. Coatings customers should note that GB/T 23987.2-2026 has been published and takes effect on 1 February 2027, when the standard version changes. Tiangang’s technical team follows these changes in advance and completes method alignment before customers switch — a direct benefit of taking part in standards work.

Tiangang on accelerated testing and life conversion: no universal conversion factor exists in this industry. Xenon-arc testing is an accelerated simulation, good for relative side-by-side comparison but unable to reproduce every real outdoor variable; the same duration ages plastics, coatings and rubber differently; and year-to-year variation in natural exposure can exceed ±30%. Tiangang does not use single-value conversion in external statements, and instead concludes from two tracks: accelerated testing plus real outdoor measurement.

Need a validation plan for your substrate?

Tiangang’s standards documentation is available from sales or the application technology center. For custom formulation work, describe your substrate and service environment and Tiangang will set out a complete validation plan, with a like-for-like comparison against your current formulation before any conclusion is issued.