Real-World Notes on titanium dioxide b101, R-6628 Grade, and What Buyers Actually Care About

If you’ve been sourcing pigments for a while, you’ve likely stumbled across titanium dioxide b101 as a shorthand spec floating around RFQs. In practice, buyers often benchmark it against R-6628 rutile grades—especially the zirconium/aluminum/organic treated types coming out of Hebei. To be honest, the differences can be subtle on paper yet material on the production line.

What R-6628 Actually Is (and Where It Comes From)

Product: TITANIUM DIOXIDE RUTILE R6628 INDUSTRY TIO2 POWDER. Origin: Jindi Industrial Park, Dacheng County, Langfang City, Hebei Province. It’s a general-purpose, multifunctional rutile TiO2 with zirconium, aluminum, and organic surface treatment—narrow particle size distribution, high whiteness, and notably solid weatherability. Common in coatings, plastics, rubber, inks. Many customers say dispersion is forgiving, which saves a pass in high-speed grind. That said, real-world results still depend on your binder system and let-down protocol.

Typical Specifications (lab values; real-world use may vary)

titanium dioxide b101 is often requested as a baseline spec in RFQs; R-6628 fits that “general-purpose rutile with weather resistance” slot. In exterior alkyds or PU, I’ve seen gloss retention hold up better than some economy TiO2s—surprisingly close to a few international brand-name benchmarks.

Process Flow, Testing, and Service Life

Process (simplified): selected ilmenite → sulfate-route conversion (commonly) → calcination to rutile → micronizing and classifying → Zr/Al inorganic coating → organic treatment → post-milling QC. Tests: ISO 591-1 classification, ISO 787 series (oil absorption, moisture, pH), ISO 7724 color, ISO 2813 gloss, and accelerated weathering (ASTM G154 QUV). Service life: interior coatings essentially long-term; exterior coatings 7–12 years gloss/color stability in quality binders (mid-latitude exposure; maintenance cycles apply).

Applications and Advantages

• Coatings: architectural, industrial, powder coatings, road marking.
• Plastics: masterbatch for PVC profiles, PP/PE film, ABS housings.
• Inks and rubber: solid opacity with decent dispersibility.
• Edge: good hiding, clean undertone, stable tint strength; nice processing latitude.

Vendor Comparison (indicative, lab means; your mileage may vary)

Customization and Compliance

Custom tweaks: hydrophilic vs. hydrophobic balance, organic treatment level for dispersion, tighter d50 if you’re chasing satin finishes, packaging (25 kg bags or drums). Certifications/Docs often available: ISO 9001, REACH, RoHS, MSDS, and batch COAs. I’d ask for QUV and salt-spray snapshots if you’re doing exterior metalwork.

Quick Field Data and Case Notes

• Lab snapshot: L 97.8; ΔE vs. control ≤ 0.5; gloss retention ~85% after 1000 h QUV (ASTM G154); ΔYI ≈ 1.2.
• Coatings plant, SE Asia: switching to R-6628 improved hiding by ~6% at same PVC, one grind pass saved ~12% energy per batch.
• PVC profile maker: chalking reduced one grade after 12 months outdoor rack; line speed unchanged.

How I’d Source It (briefly)

Request three lots, run let-down in your binder matrix, test per ISO 7724 and G154. Compare against your incumbent and a premium control. If results align, lock in a rolling forecast—pigment consistency over time matters more than a one-off star batch.

Authoritative citations

1. ISO 591-1:2019 Pigments — Titanium dioxide — Part 1: Requirements and test methods.
2. ISO 787 series (general methods of test for pigments and extenders), incl. parts 5, 9.
3. ISO 7724 (Colorimetry) and ISO 2813 (Gloss) for coatings evaluation.
4. ASTM D476 (Standard Classification for Titanium Dioxide Pigments) and ASTM G154 (QUV).