TECHNICAL BUYING GUIDE
Understand what the production route can indicate—and which grade-level evidence still needs to be checked before qualification.
Jump to the grade evaluation frameworkTHE SHORT ANSWER
Chloride and sulfate identify two different production routes for titanium dioxide pigment. The production route can influence how the base pigment is formed, but the route label alone is insufficient to establish a grade-level performance conclusion. Opacity, hiding power, undertone, weatherability, dispersion and formulation suitability should be evaluated using current grade-specific evidence and, where relevant, application-specific testing under the buyer’s intended conditions.
The practical question is therefore not which label wins in general, but whether the exact grade has suitable, comparable evidence for the intended use.
PROCESS ORIENTATION
Chloride and sulfate are established industrial routes for producing pigmentary titanium dioxide (TiO2). The simplified sequences below explain what each label refers to. They are orientation tools, not complete plant descriptions and not performance rankings.
Chloride route
Titanium-bearing feedstock → chlorination → titanium tetrachloride purification → oxidation → base TiO2 → finishing and treatment
In the chloride route, titanium-bearing feedstock is chlorinated to form titanium tetrachloride (TiCl4). The TiCl4 is purified and then oxidized to form titanium dioxide. The base pigment then proceeds through finishing and treatment steps used to create a commercial grade.
Sulfate route
Titanium-bearing feedstock → sulfuric-acid digestion or dissolution → titanyl sulfate → hydrolysis → hydrated TiO2 → calcination → base TiO2 → finishing and treatment
In the sulfate route, titanium-bearing material is digested or dissolved in a sulfuric-acid system to form a titanium-bearing sulfate solution. Hydrolysis produces a hydrated titanium dioxide intermediate, which is calcined to form TiO2 before finishing and treatment.
EVIDENCE BOUNDARY
A production-route label belongs in a complete grade record, but it should not be used as a shortcut for properties that require grade-level evidence.
Route labels also do not establish price, production economics, availability or general versatility. Those depend on the specific product, application, supplier and transaction and are not compared on this page.
Do not ignore the route, and do not stop at the route. The next decision should be based on the exact grade evidence and the buyer’s application conditions.
GRADE EVALUATION
Start with the performance question that matters in the intended formulation or process. Then compare current evidence for the exact grades using compatible methods and conditions.
Current grade-specific optical data, the declared method and a formulation-relevant comparison
Values from different methods, pigment concentrations or formulations should not be treated as directly equivalent.
Grade-specific colour or undertone data with its method, reference and test conditions
Do not assign a universal colour response to either production route.
Surface-treatment information and relevant accelerated or outdoor exposure evidence
The test type, substrate, binder or system, exposure conditions and duration must be understood.
Grade treatment, relevant physical data and evidence from the buyer’s resin, vehicle or process window
Use in the same application family does not prove identical processing behaviour.
Grade-specific evidence for the intended temperature, residence time and processing conditions
The route label alone does not establish suitability for the intended process.
Current technical data sheet (TDS), source date, test method, units, typical-versus-specification status and sample identity
A typical value describes reported product data; it is not automatically a guaranteed specification.
This framework organizes the questions a buyer should resolve. It is not a product specification, a process scorecard or a grade recommendation.
APPLICATION CONTEXT
Yes, application-family overlap can occur. First-party evidence from LB Group identifies a chloride-process rutile grade and a sulfate-process rutile grade for plastics-related use. Separately, Tronox states that it uses both chloride and sulfate processes to make products used by manufacturers of coatings, plastics and décor paper.
The two LB Group examples directly establish plastics-family overlap. The Tronox statement provides portfolio-existence context only; it is not used to claim that each route separately covers all three application families. None of these examples establishes identical performance, equivalence, substitution or suitability in a buyer’s formulation.
QUALIFICATION METHOD
Use the route label as one input, then move the comparison to the exact grade, evidence and intended operating conditions.
Record the formulation, substrate, processing window and performance questions that matter. Define the evidence and acceptance criteria needed for the decision.
Confirm the product and grade identity, then record the stated production route as one field in the grade record. Do not treat it as the performance conclusion.
Obtain relevant technical data, treatment information, test methods, dates and evidence status from the correct product or document source. Check that every record refers to the material being evaluated.
Align units, methods, test conditions and typical-versus-specification status before comparing values. Record any mismatch that prevents a like-for-like interpretation.
Where relevant, use application-specific laboratory or production testing under the buyer’s intended conditions before qualification, substitution or scale-up decisions.
Use this path when the grade identity and evidence are clear enough to support an application-relevant test plan.
Use this path when a current document, test method, treatment detail, sample identity or comparison condition is missing.
Use this path when methods or materials cannot be aligned, evidence conflicts, or the intended conditions have not been defined. A hold is an evidence decision, not proof that a route or grade is unsuitable.
BUYER QUESTIONS
The process label does not establish a universal winner. Production route can influence how the base pigment is formed, but grade-level performance still needs to be assessed using current evidence for the exact grade and, where relevant, testing under the buyer’s intended conditions.
Yes. Official European records support that rutile pigment can be produced through either route. That process-and-crystal-form fact does not make individual rutile grades interchangeable.
No. A shared route label does not establish equivalent performance or substitution. Equivalence requires defined criteria, compatible methods, evidence for each exact grade and validation in the intended formulation or process.
The route label alone is insufficient to establish those grade-level conclusions. Compare current grade-specific optical and colour data, treatment information, durability evidence, methods and test conditions, then validate the properties that matter in the intended system.
SOURCE NOTES
The process descriptions use official technical sources. Manufacturer sources are limited to what the named producer says about its own route or grade and are not used to establish universal process superiority.
Sources reviewed:
Technical Support Document for the Titanium Dioxide Production Sector
High-level recognition of the chloride and sulfate routes and the chloride-route sequence from chlorination through TiCl4 purification and oxidation.
Published 2009; source reviewed 5 September 2026.
Large Volume Inorganic Chemicals—Solids and Others Industry BREF; Draft Preliminary Report for EU Ecolabel Paints
Official scope for both industrial routes and concise process-mechanics support for the formation and finishing descriptions. The preliminary report is a draft dated 16 October 2024 and is not used as final policy or comparative-performance evidence.
BREF adopted August 2007; preliminary report dated 16 October 2024; sources reviewed 5 September 2026.
Case M.8451 — Tronox / Cristal
Support for the limited statement that rutile pigment can be produced through either route. It is not used as grade-suitability or equivalence evidence.
2018; source reviewed 5 September 2026.
Titanium Dioxide
Broader portfolio-existence context: the producer states that it uses both chloride and sulfate processes for products used by coatings, plastics and décor-paper manufacturers. It does not establish that each route separately serves every listed application.
Source reviewed 5 September 2026.
BILLIONS BLR-886 pigment
Direct named-grade evidence for a chloride-process rutile titanium dioxide pigment described for plastics.
Source reviewed 5 September 2026.
LR-108 Technical Data Sheet
Direct named-grade evidence for a sulfate-process rutile titanium dioxide pigment described for masterbatch, compounding and plastics.
Technical data sheet dated November 2024; source reviewed 5 September 2026.
A source supports only the statement family identified above. Publication dates and source-review dates are different.
NEXT STEP
Use the route comparison to frame the questions, then review current information for the exact titanium dioxide grades under consideration. Compare grade evidence against the intended formulation, process and acceptance criteria before deciding whether testing should continue.
