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Ultranox 626

Ultranox 626 Structure
Ultranox 626 structure
CAS No.
26741-53-7
Chemical Name:
Ultranox 626
Synonyms
antioxidant 24;THP-24;Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite;mark pep 24;ADK Stab PEP 24;Bis-(2,4-di-tert-butylphenyl)-pentaerythrityl diphosphite;Bis-(2,4-di-tert-butyl-pheny)-phosphiterythritol diphosphite;AN 626;AO-626;Ultranox 626
CBNumber:
CB0855183
Molecular Formula:
C33H50O6P2
Molecular Weight:
604.69
MDL Number:
MFCD00071521
MOL File:
26741-53-7.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-06-24 18:39:39
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Ultranox 626 Properties

Melting point 160-178°C
Boiling point 555.8±50.0 °C(Predicted)
Density 1.166[at 20℃]
vapor pressure 0Pa at 25℃
storage temp. under inert gas (nitrogen or Argon) at 2-8°C
solubility Chloroform (Slightly), Hexanes (Slightly, Heated)
form Solid
color White to Off-White
Water Solubility 93μg/L at 25℃
Stability Hygroscopic
InChIKey AIBRSVLEQRWAEG-UHFFFAOYSA-N
SMILES C1C2(COP(OC3=CC=C(C(C)(C)C)C=C3C(C)(C)C)OC2)COP(OC2=CC=C(C(C)(C)C)C=C2C(C)(C)C)O1
LogP 10.9 at 25℃
Indirect Additives used in Food Contact Substances PHOSPHOROUS ACID, CYCLIC NEOPENTANETETRAYL BIS(2,4-DI-TERT-BUTYLPHENYL) ESTER
CAS DataBase Reference 26741-53-7(CAS DataBase Reference)
FDA 21 CFR 178.2010
EWG's Food Scores 1
FDA UNII GV29P0K7AC
EPA Substance Registry System Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (26741-53-7)

SAFETY

Risk and Safety Statements

Symbol(GHS)  Environment (GHS09)
GHS09
Signal word  Warning
Hazard statements  H410
Precautionary statements  P273-P391-P501
TSCA  TSCA listed
HS Code  2920.29.0000
REACH Registrations Active
NFPA 704
0
2 0

Ultranox 626 price More Price(55)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
TCI Chemical B5664 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane >95.0%(GC) 26741-53-7 5g $42 2026-04-30 Buy
TCI Chemical B5664 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane >95.0%(GC) 26741-53-7 25g $125 2026-04-30 Buy
Biosynth FA40363 AntiOxidant 24 26741-53-7 250g $267.5 2026-06-04 Buy
Biosynth FA40363 AntiOxidant 24 26741-53-7 500g $400 2026-06-04 Buy
Biosynth FA40363 AntiOxidant 24 26741-53-7 1000g $580 2026-06-04 Buy
Product number Packaging Price Buy
B5664 5g $42 Buy
B5664 25g $125 Buy
FA40363 250g $267.5 Buy
FA40363 500g $400 Buy
FA40363 1000g $580 Buy

Ultranox 626 Chemical Properties,Uses,Production

Appearance

Ultranox 626 is a white powder or granule.  

Application

Antioxidant 626 (ultranox 626) is Approved by the FDA for food contact applications under 21CFRl78.2010 covering antioxidants and/or stabilizers for poly­mers.

Features

Ultranox 626 (Antioxidant 24, Irgafos 126) is suitable for polyolefins, polyesters, styrenes, engineering thermoplastics, PVC, elastomers and adhesives. Its products have excellent color stability, reduced polymer degradation, low dosage and higher phosphorus content than competitive phosphite antioxidants. It has synergistic effects when used with light stabilizers such as benzophenone and benzotriazole.

Description

Antioxidant 626 is a white to off-white powdery substance with low volatility and higher efficiency. It is often used in combination with hindered phenolic antioxidants.

Characteristics

Excellent colour stability during compounding, fabrication and end-use.
Reduction in polymer degradation during processing.
Improved gas fading performance in many applications.
High performance at low loading levels for more cost-effective formulations.
Higher phosphorous content than competitive phosphite antioxidants.
Synergism when used with light stabilizers such as benzophenones and benzotriazoles.

Uses

Antioxidant 626 is suitable for: polyolefin and olefin copolymers, polycarbonate, polyamide and other engineering plastics, rubber and elastomers, coatings and adhesives.

Definition

Ultranox 626 is a solid organophosphite antioxidant that improves gas fading performance and color stability during compounding, fabrication, and end use. It delivers high performance at low loading rates, making this a cost-effective addition to polymer formulas. Ultranox 626 synergizes with benzophenone and benzotriazole light stabilizers. It is so effective that it can replace another phosphite antioxidant in your formula and deliver equivalent performance at a significantly lower dosing rate.

Flammability and Explosibility

Not classified

Synthesis

2,4-Di-tert-butylphenol

96-76-4

3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane

3643-70-7

Ultranox 626

26741-53-7

(3) The product dichloropentaerythritol diphosphite obtained from step (2) was dropwise added to a 0.6 mol/L aqueous solution of 2,4-di-tert-butylphenol. The molar ratio of 2,4-di-tert-butylphenol to dichloropentaerythritol diphosphite was maintained at 2.30:1. The mixture was stirred under nitrogen at a speed of 800 rpm and reacted at 60°C for 2 hours. The hydrogen chloride gas generated during the reaction was absorbed by a sodium hydroxide solution. (4) The solvent was removed by vacuum distillation under reduced pressure at 100°C and 0.06 MPa. An appropriate amount of isopropanol was then added to the residue, and the mixture was stirred to crystallize the product. (5) The reaction mixture obtained from step (4) was subjected to suction filtration to yield a white solid powder, identified as bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

References

[1] Patent: CN108250240, 2018, A. Location in patent: Paragraph 0034; 0037; 0038; 0106; 0108; 0110; 0112; 0114

Ultranox 626 synthesis

96-76-4
3643-70-7
26741-53-7
Synthesis of Ultranox 626 from 2,4-Di-tert-butylphenol and 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane

Ultranox 626 Preparation Products And Raw materials

Raw materials

3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 2,4-Di-tert-butylphenol Pentaerythritol

Preparation Products

Ultranox 626 Suppliers

Global( 260)Suppliers
Supplier Tel Email Country ProdList Advantage
Hubei Hengjie Chemical Co., Ltd 15623078521; 15623078521 1836463726@qq.com China 3578 58
Tianjin Zhongxin Chemtech Co., Ltd. 022-66880623 sales@tjzxchem.com China 612 60
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
TAIYUAN RHF CO.,LTD. +86 351 7031519 sales@RHFChem.com China 2334 56
TCI (Shanghai) Development Co., Ltd. 021-67121386 Sales-CN@TCIchemicals.com China 24512 81
Beijing HwrkChemical Technology Co., Ltd 89508211 18501085097 sales.bj@hwrkchemical.com China 9407 55
Energy Chemical 400-0056266 sales8178@energy-chemical.com China 44850 61
XiaoGan ShenYuan ChemPharm co,ltd 15527621225; 15527621225 1791901229@qq.com China 6744 52
Chembridge International Corp.(Taipei/Dongguan/Nanjing) 025-84712192 china@chembridge.net China 192 62
Shandong Xiya Chemical Co., Ltd 13355009207 13355009207 3007715519@qq.com China 18722 57
Supplier Advantage
Hubei Hengjie Chemical Co., Ltd 58
Tianjin Zhongxin Chemtech Co., Ltd. 60
J & K SCIENTIFIC LTD. 76
TAIYUAN RHF CO.,LTD. 56
TCI (Shanghai) Development Co., Ltd. 81
Beijing HwrkChemical Technology Co., Ltd 55
Energy Chemical 61
XiaoGan ShenYuan ChemPharm co,ltd 52
Chembridge International Corp.(Taipei/Dongguan/Nanjing) 62
Shandong Xiya Chemical Co., Ltd 57

View Lastest Price from Ultranox 626 manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Antioxidant 24 pictures 2026-09-11 Antioxidant 24
26741-53-7
 1KG 95%min 1000kg WUHAN FORTUNA CHEMICAL CO., LTD
Ultranox 626 pictures 2026-09-02 Ultranox 626
26741-53-7
 $1.20-35.00 1kg 99% Henan Fengda Chemical Co., Ltd
Antioxidant 626 pictures 2026-07-31 Antioxidant 626
26741-53-7
 1kg 98.0%min 100tons Wuhan KEMI-WORKS Chemical Co., Ltd.
  • Ultranox 626 pictures
  • Ultranox 626
    26741-53-7
  • $1.20-35.00
  • 99%
  • Henan Fengda Chemical Co., Ltd

26741-53-7(Ultranox 626)Related Search:

Clindamycin phosphate Pentaerythrityl oleate Antioxidant 1010 tert-Butylchlorodiphenylsilane 4,4'-Thiobis(6-tert-butyl-m-cresol)
Sodium triacetoxyborohydride Antioxidant 168 Di-tert-butyl peroxide 3,9-Bis(2,4-dicuMylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Bis(2,6-di-ter-butyl-4-methylphenyl)pentaerythritol-diphosphite
Distearyl thiodipropionate Antioxidant 1520 Antioxidant 1330 Dipentaerythritol Butylated hydroxytoluene (BHT)
Sulphosuccinic acid ester Di-tert-butyl ether Complex antioxidant

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Ultranox 626 3,9-bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane BIS-(2,4-DI-TERT-BUTYLPHENYL)PENTAERYTHRITOL DIPHOSPHITE (ULTRANOX 626) 2,4,8,10-Tetraoxa-3,9-diphosphaspiro5.5undecane, 3,9-bis2,4-bis(1,1-dimethylethyl)phenoxy- 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro(5.5)undecan 4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4-bis(1,1-dimethylethyl)phenoxy]-2 phosphorous acid, cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl)ester Alknox P-24(Great Lake)Ultranox 626(GE) cyclic neopentanetetrayl bis(di-tert-butylphenyl)phosphite Antioxidant AT-626 2,2'-Bis(2,4-di-tert-butylphenoxy)spiro[1,3,2-dioxaphosphorinane-5,5'-[1,3,2]dioxaphosphorinane] Alkanox-P-24 Antioxidant 24, Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite Bis(2,4-di-tbutylphenyl) Pentaery thritol Diphosphite AN 626 antioxidant AN 626 Bis-(2,4-di-tert-butyl-pheny)-phosphiterythritol diphosphite Antioxidant 626 (Bis(2.4-di-t-butylphenyl) Pentaerythritol Diphosphite) 3,9-bis(2,4-bis(1,1-dimethylethyl)phenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro(5.5)undecane Antioxidants Impurity 14 Ultranox 626 @50 μg/mL in Isopropanol AO-626 Pentaerythritol Bis(2,4-di-tert-butylphenylphosphite) Antioxidant 24 ISO 9001：2015 REACH ANTIOXIDANT TRUELICHT AN626 Antioxidant Sunoxy 626 RIANOX 626 Phosphite Antioxidant 626 Antioxidant RIANOX 626/626FF Antioxidant 24 CAS 26741-53-7 Sinanox? 626 / Ultranox 626 / Irgafos 126 Secondary Antioxidants YD 626 Bis (2, 4-ditert-butylphenyl) pentaerythritol bisdiphosphite CHLUMIAO 626 Ultranox 626/Bis(2,4-di-t-butyl-phenyl)pentaerythritol diphosphite/Antioxidant 626 ADK Stab PEP 24 mark pep 24 antioxidant 24 Bis-(2,4-di-tert-butylphenyl)-pentaerythrityl diphosphite Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite THP-24 26741-53-7 Industrial/Fine Chemicals Organics