Chloride vs Sulfate Titanium Dioxide Comparison
Chloride vs Sulfate Titanium Dioxide Comparison
Titanium dioxide is the white pigment that gives plastics their clean brightness and solid opacity. Extracted mainly from ilmenite ore, it is refined and ground into fine particles that scatter light so effectively that even small amounts can turn a clear or muddy resin pure white and hide whatever sits underneath.
In masterbatch production it is the workhorse that lets compounders create highly loaded white concentrates; those concentrates are then diluted into polyethylene, polypropylene and other resins to deliver consistent color, good dispersion and reliable filter performance on high-speed lines.
In PVC the same pigment does double duty: it supplies the bright, uniform appearance demanded by window profiles, siding and pipes while also helping the material resist UV-driven chalking and yellowing outdoors.
Chloride and sulfate are the two main ways of turning ilmenite into titanium dioxide pigment. In the sulfate route the ore is dissolved in sulfuric acid, purified, and then calcined to form the final crystals. The chloride route starts with higher purity feedstock, reacts it with chlorine gas, and builds the pigment particles in a continuous vapor-phase process.
For many years, the titanium dioxide industry had a very simple way of looking at quality. Chloride process TiO2 was considered the premium product, while sulfate process TiO2 was considered the economical alternative.
That view was especially common before the year 2010, when most of the high end TiO2 used in demanding applications came from Western manufacturers using chloride technology.
At that time, there was a clear difference between the leading chloride products and many sulfate products. If a manufacturer wanted the highest level of whiteness, optical performance, dispersion, durability and consistency, chloride was normally the first choice.
Sulfate TiO2 was not widely used, It was generally associated with lower cost and lower performance.That situation has changed considerably.
During the 2010s, Chinese TiO2 manufacturers invested heavily in improving sulfate technology. Production control, calcination, particle size control and surface treatment improved significantly.
By around 2020, sulfate TiO2 had become a major part of global consumption, with China accounting for a very large share of this growth.
But it is important to make one point clear: Not all Chinese sulfate TiO2 is highest quality. There are still Chinese manufacturers whose products are behind the leading international grades.
At the same time, some Chinese manufacturers have made major technological improvements and are now producing sulfate TiO2 at a much higher level.
So today, it is not correct to look at “Chinese sulfate” as one quality category.There are different levels of technology and quality between manufacturers.
After 2020, some Chinese manufacturers continued to invest in better process control, particle size distribution and surface treatment. With the unforeseen profits recorderded during Covid19 Period.
A TiO2 grade for paint does not necessarily have the same requirements as a TiO2 grade for white masterbatch, PVC profile, film or engineering plastics.
For plastics, dispersion, melt flow, FPV, thermal stability, yellowing and processing behavior can be just as important as basic whiteness.
Chinese TiO2 companies understood it. They started investing in modern process technologies. This is where the comparison between chloride and sulfate becomes much more interesting.
| Chloride TiO2 | Sulfate TiO2 | |
| Traditional market perception Before the year 2010 | Premium quality | Economical quality |
| Market Perception between 2010 and 2020 | Generally higher quality | Generally lower quality |
| Technology today (After 2020) | Advanced | Ranges from basic to very advanced |
| Whiteness | Excellent | Good to excellent |
| Dispersion | Excellent in good grades | Good to excellent in advanced grades |
| Yellowing resistance | Both Yellow Tone and Bluish Tint available | Both Yellow Tone and Bluish Tint availabl |
| Masterbatch | Excellent | Advanced grades can be excellent. Lower grades also available |
| PVC | Excellent | Advanced grades can be excellent |
| Price | Usually higher | Usually more competitive |
| Quality consistency | Depends on manufacturer | Depends strongly on manufacturer |
One area where today’s comparison can surprise customers is yellowing.
Traditionally, chloride TiO2 had a strong reputation for high temperature stability and color performance.That reputation still has a basis, and good chloride grades remain very strong products.
But some modern sulfate grades have improved considerably.Depending on the polymer and processing conditions, a good sulfate grade can show very good resistance to yellowing. In some specific applications, it can even perform better than a particular chloride grade.
This is why a customer should not decide based only on the process.The actual grade should be tested under the same temperature, residence time and polymer conditions.
The same applies to whiteness.The leading chloride grades remain excellent in whiteness and optical properties.But the better sulfate grades available today can also provide very high whiteness, good opacity and a clean undertone.
In many applications, the difference between a good sulfate grade and a good chloride grade is now much smaller than it was 15 years ago.
Again, this does not mean that all sulfate products have reached the same level.There are still significant differences between manufacturers.
For example,JIUTA is one of the premium titanium dioxide company from China, JTR 799T It focuses on high tinting strength, a very bluish undertone and stable FPV for high loading polyolefin masterbatch and engineering plastics.
JTCR 599, for example, is a chloride process rutile grade for highly loaded thermoplastic masterbatch, ABS and engineering plastics. It is designed around fine particle size, melt fluidity and high temperature resistance.
Lets have a comparison of the data.
| JTR 799T | JTCR 599 | |
| TiO2 type | Rutile | Rutile |
| Main application | High loading masterbatch | High loading masterbatch |
| Polyolefin masterbatch | Yes | Yes |
| Engineering plastics | Yes | Yes |
| Bluish undertone | Very strong | Strong |
| TiO2 content | ≥97% | ≥97% |
| Organic treatment | Yes | Yes |
| Alumina treatment | Yes | Yes |
| Oil absorption | 15 | 15 |
| Median particle size | ~0.32 μm | ~0.30 μm |
| Specific gravity | ~4.1 | ~4.1 |
| Dispersion | Excellent | Excellent |
| Tinting strength | High | High |
| Whiteness / opacity | High | High |
| Processing performance | Very good | Very good |
When JTR 799T is compared with JTCR 599, the interesting point is that the comparison is not simply Sulfate means lower quality or Chloride means higher quality.
Both are designed for demanding plastics applications, but they have different performance characteristics. The right choice depends on the formulation and the processing conditions.
A chloride grade from a strong manufacturer can still be excellent.A sulfate grade from a weaker manufacturer can still have limitations.
But an advanced sulfate grade from a strong manufacturer can be surprisingly close to, and in some application areas sometimes better than, a chloride grade.
JIUTA’s product range is a good example of this development. Its portfolio contains sulfate grades such as JTR 799, JTR 799T, JTR 509 and JTR 508, as well as chloride grades such as JTCR 599, JTCR 504, JTCR 505 and JTCR 530. These products are not simply separated by process; they are developed around different application requirements.
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