250G High-Purity Specialty Carbon Black
High-cleanliness, high-structure, low-surface-area specialty carbon black. Iodine 75±5 g/kg; DBP 180±10 ml/100g; ash 0.20 Max. For nitrides, carbides, ceramics and high-purity polymers.
DLCARBON 250G is a high-purity specialty carbon black. Its dedicated TDS describes it as a grade with high cleanliness, high structure, low specific surface area, and an extremely low content of metal impurities and trace elements. CAS No. 1333-86-4 · H.S. Code 2803000000 · general chemical grade.
250G chemical specifications
Values below come from the 250G technical data sheet (printed 3 August 2025), including the test-method numbers printed next to each row.
| Technical specifications (TDS) | |||
|---|---|---|---|
| DLcarb Industry Co., Ltd | |||
| Product | Specialty carbon black | Grade | 250G |
| No. | Item | Unit | Specification |
| 1 | Iodine absorption | g/kg | 75±5 |
| 2 | DBP absorption | ml/100g | 180±10 |
| 3 | NSA (specific surface area) | m²/g | 60~80 |
| 4 | Heating loss | % | 0.30 Max |
| 5 | Ash content (825°C) | % | 0.20 Max |
| 6 | 325-mesh sieve residue | ppm | 50 Max |
| 7 | pH | - | 7~9 |
Test methods printed on the TDS: GB/T 3780.1-2015 (iodine absorption), GB/T 3780.2-2017 (DBP absorption), GB/T 10722-2014 (NSA), GB/T 3780.8-2019 (heating loss), GB/T 3780.10-2017 (ash), GB/T 3780.21-2016 (325-mesh sieve residue), GB/T 3780.7-2016 (pH).
Note: figures above are TDS specification ranges for reference. Delivery specifications follow the technical agreement we confirm with you. Please validate the grade in your own formulation and process. Safety information sits in the SDS (EU REACH), not in the TDS table.
Purity-sensitive uses listed on the 250G TDS
The 250G sheet states that the grade is suitable for nitrides (such as aluminum nitride and silicon nitride), carbides, special ceramics, and conductive or antistatic rubber, plastics and silicone products that need extremely high purity. We do not add applications beyond that sentence. If impurity limits are driving the choice, see when to choose high-purity carbon black and the high-purity carbon black overview.
250G beside C50
C50 has its own TDS, also dated 3 August 2025. On paper the two grades share heating loss (0.30 Max), ash at 825°C (0.20 Max) and pH (7~9). 250G publishes iodine absorption 75±5 g/kg, DBP absorption 180±10 ml/100g, NSA 60~80 m²/g and a 325-mesh sieve residue of 50 ppm Max; it does not publish an iron figure. C50 publishes iodine absorption 90±10 g/kg, a wider DBP window of 180~260 ml/100g, NSA 65~80 m²/g and Fe 20 ppm Max, and it does not publish a sieve-residue row. C50’s sheet also states that it is produced by cracking high-purity gas raw materials. On applications, the 250G TDS includes plastics; the C50 TDS lists rubber and silicone but does not mention plastics.
Files you can download
Alongside the TDS we publish an EU REACH SDS for carbon black (CAS 1333-86-4) and three SGS reports dated 26 June 2026 on a submitted carbon black sample: REACH Candidate List SVHC screening (253 substances, results ≤0.1% w/w, plus one potential SVHC also ≤0.1% w/w); EU RoHS Directive (EU) 2015/863 amending Annex II to 2011/65/EU (Pass); and halogen testing to IEC 62321-3-2:2020 (fluorine, chlorine, bromine and iodine reported ND on that sample; MDL 20 mg/kg for F and 50 mg/kg for Cl, Br and I). Those reports describe the submitted sample — they are not a substitute for the grade TDS or a lot COA. The SDS service summary includes DLCARB 250G among the listed model numbers.
Downloads: 250G Technical Data Sheet (PDF) · SDS — EU REACH (PDF) · REACH SVHC screening (PDF) · RoHS report (PDF) · Halogen report (PDF)
The TDS storage note is the same across these sheets: keep the material in a cool, dry, well-ventilated warehouse; protect it from moisture; guard against dust inhalation and skin contact; store it apart from strong oxidants and do not mix-store. For classification and safe handling, follow the SDS rather than the short TDS footnote. MOQ and Incoterms are omitted until we quote.
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Key features
- High cleanliness, high structure, low specific surface area (TDS)
- Iodine 75±5 g/kg; DBP 180±10 ml/100g; NSA 60~80 m²/g; ash 0.20 Max
- 325-mesh sieve residue 50 ppm Max; no published Fe figure on this sheet
- Dedicated 250G TDS, EU SDS (model listed) and June 2026 SGS sample reports