Chemical name: 6-Amino-1,3-Dimethyluracil (CAS 6642-31-5)
CAS: 6642-31-5
EINECS: 229-662-0
Molecular formula: C6H9N3O2
Molecular weight: 155.15
Specification:
| Item | Standard |
| Appearance | White or light yellow powder |
| Assay | 99% min |
| Melting point | 275 dC min |
| Loss on drying | 1.0% max |
| Mesh size 80um | 99% min |
Usage:
1,3-Dimethyl-6-aminouracil (DAU) is primarily used as an organic-based heat stabilizer in the production of PVC (polyvinyl chloride). Its key benefits in PVC stabilization include enhancing the storage modulus at room temperature, exceptional short-term thermal stability, and maintaining the original color of PVC over multiple processing cycles. Additionally, DAU has minimal impact on the mechanical properties of PVC after repeated processing cycles. This makes it a promising choice for safer and effective PVC stabilization.
Packing: 25 kg per cardboard drum or woven bag; custom packaging available.
Storage: Store in a cool, dry, well-ventilated area away from heat and oxidizing agents. Minimum shelf life: 2 years.
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Why Choose DAU as a PVC Stabiliser
Traditional PVC stabilisers — including organotin and lead-based compounds — present environmental and health risks that are increasingly restricted by global regulations (EU RoHS, REACH). DAU offers a non-toxic, heavy-metal-free alternative with comparable or superior thermal performance. It demonstrates excellent synergistic effects when combined with calcium-zinc (Ca/Zn) stabiliser systems, further improving colour stability and extending the processing window. DAU is particularly valued in medical-grade PVC, food-contact packaging, and wire insulation applications where regulatory compliance is mandatory. Its uracil ring structure provides unique thermal absorption properties that protect PVC polymer chains from dehydrohalogenation at elevated processing temperatures.