Rotomolding Water Tanks & Storage Containers — Food-Contact, Anti-Extraction
💧 Rotomolding Water Tanks & Storage Containers
1. Demanding Operating Conditions
- Food-contact compliance: FDA 21 CFR, EU 10/2011, GB 4806.7 required
- Anti-migration: low SML compliance with drinking water
- Anti-extraction: long-term contact with water/acids/alkali/disinfectants
- Long service life: 10+ year warranty, QUV 16k+ hours required
- Anti-microbial: long-term water storage may foster algae/bacteria
- Structural stress: large tanks 8–15 mm wall require core-layer stabilization
2. Tiangang Recommended Solutions
Solution A: Drinking water / RV tanks (food-contact, high weathering)
| Component | Model | Dosage | Function |
|---|---|---|---|
| High-MW HALS | HS-944 | 0.20–0.30% | Primary UV, anti-extraction |
| High-MW UV-A | UV-360 | 0.10–0.20% | UV-A absorption |
| Phenolic AO | AO-1010 | 0.05–0.10% | Processing stability |
| Phosphite AO | AO-168 | 0.10–0.20% | Long-term thermal stability |
Solution B: Chemical liquid tanks (acid/alkali/salt)
Why NOR XT-8: Traditional HALS lose efficiency in pH < 4 or > 10 environments as nitroxyl radicals are quenched. XT-8 maintains stability across pH 2–12 — ideal for chemical tanks, pesticide tanks and marine applications.
Recommended: XT-8 0.15–0.25% + UV-327 0.15–0.25% + AO-1010/AO-168 0.15–0.25%.
Solution C: Pesticide / agricultural tanks (sulfur, chlorine)
Recommended: HS-112 0.20–0.30% + UV-326 0.15–0.25% + AO-1076/AO-168 0.20–0.35%.
Solution D: UV Masterbatch (drop-in solution)
For small/medium rotomolders: TGUVFQ2001PE food-contact masterbatch at 4:96 – 5:95 let-down ratio. Pre-blended, FDA/EU compliant, simplified dosing.
3. Food-Contact Compliance
- FDA 21 CFR: HS-944, HS-770, HS-962, AO-1076, AO-168 — indirect food contact approved (SML/QM calculations required)
- EU 10/2011: HS-944, HS-950, UV-360, XT-8 — EU plastic food-contact material compliant
- GB 4806.7: Chinese food-contact plastic additive standard — Tiangang products within limits
Recommendation: Request the Food-Contact Compliance Statement for your specific part, and conduct migration testing per your target market (FDA / EU / GB).
Need a custom water tank formulation?
Share your resin, wall thickness, target life and compliance requirements — Tiangang application lab responds within 48 hours.
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