Zinc Dibutyldithiocarbamate is used as an activator and accelerator in natural and butyl rubber, as well as in natural and synthetic latexes.
Zinc Dibutyldithiocarbamate is registered under the REACH Regulation and is manufactured in and/or imported to the European Economic Area, at ≥ 1,000 to < 10,000 tonnes per annum.
Zinc Dibutyldithiocarbamate is a dermatological sensitizer and allergen, with sensitivity identified through clinical patch tests.
CAS Number: 136-23-2
EC Number: 205-232-8
Molecular Formula: C18H36N2S4Zn
Molecular Weight: 474.1 g/mol
Synonyms: di-n-Butyldithiocarbamic acid,zinc salt, Zinc, bis(dibutylcarbamodithioato-S,S')-, (T-4)-, Zinc, bis(dibutyldithiocarbamato)-, Aceto zdbd, Bis(dibutyldithiocarbamato)zinc, Butazate, Butazate 50-D, Butyl zimate, Butyl ziram, Carbamic acid, dibutyldithio-, zinc complex, Dibutyldithiocarbamic acid zinc salt, USAF GY-5, Vulcacure, Vulkacit ldb/C, Zimate, butyl, Zinc bibutyldithiocarbamate, Zinc N,N-dibutyldithiocarbamate, Accelerator BZ powder, Butasan, Butasan vulcanization accelerator, Butazin, Nocceler BZ, Octocure ZDB-50, Perkacit ZDBC, Soxinol BZ, ZBC, Zinc bis(dibutyldithiocarbamate), Zinc di-n-butyl dithiocarbamate, bis(dibutyldithiocarbamate)zinc(II), Zinc(II) Dibutyl dithiocarbamate, Zinc bis(dibutyldithiocarbamate), Zinc N,N-dibutylcarbamodithioate, Dibutyldithiocarbamic Acid Zinc(II) Salt, carbamate-BZ, ZDBC (BZ), (Dibutyldithiocarbamato)zinc(II), Accel BZ, Aceto ZDBD, Bis(N,N-dibutyldithiocarbamato)zinc, Bis(dibutyldithiocarbamato)zinc, Butazate, Butazate 50-D, Butyl zimate, Butyl ziram, Carbamic acid, dibutyldithio-, zinc complex, Carbamodithioic acid, dibutyl-, zinc salt, Dibutyldithiocarbamic acid zinc salt, Nocceler BZ, Soxinol BZ, Vulcacure, Vulcacure ZB, Vulkacit LDB, Vulkacit LDB/C, Zimate, butyl, Zinc N,N-dibutyldithiocarbamate, Zinc bis(dibutyldithiocarbamate), Zinc dibutyldithiocarbamate, Zinc, bis(dibutylcarbamodithioato-S,S')-, (T-4)-, Zinc, bis(dibutylcarbamodithioato-kappaS,kappaS')-, (T-4)-, Zinc, bis(dibutyldithiocarbamato)-, [ChemIDplus] ZDBC, [HSDB], Zinc N,N-dibutyldithiocarbamate, Butyl zimate, Di-n-butyldithiocarbamic Acid Zinc Salt, Butasan, Butazate, Butazin, Nocceler BZ, Soxinol BZ, ZBC, Zinc, bis(dibutylcarbamodithioato-S,S')-, (T-4)-, Zinc bis(dibutyldithiocarbamate), NSC-3880, ZINC BIS(DIBUTYLDITHIOCARBAMATE), ZINC DIBUTYLDITHIOCARBAMATE, ZINC DIBUTYLDITHIOCARBAMATE [INCI], ZINC, BIS(DIBUTYLCARBAMODITHIOATO-S,S')-, ZINC, BIS(DIBUTYLDITHIOCARBAMATO)- [HSDB], ZINCDIBUTYLD ITHIOCARBAMATE, 2,6-bis(dibutylamino)-1,3,5,7-tetrathia-4-zincaspiro[3.3]hepta-1,5-diene-1,5-bis(ylium), Accelerator BZ powder, Aceto zdbd, Bis(dibutyldithiocarbamato)zinc, Bis(N,N-dibutylthiocarbamoylthio)zinc, Butasan, Butasan vulcanization accelerator, Butazate, Butazate 50-D, Butazin, Butyl zimate, Butyl ziram, Carbamic acid, dibutyldithio-, zinc complex, di-n-Butyldithiocarbamic acid,zinc salt, Dibutyldithiocarbamic acid zinc salt, Nocceler BZ, Octocure ZDB-50, Perkacit ZDBC, Soxinol BZ, Vulcacure, Vulkacit ldb/C, ZBC, Zimate, butyl, Zinc bibutyldithiocarbamate, Zinc di-n-butyl dithiocarbamate, Zinc dibutyldithiocarbamate, Zinc N,N-dibutyldithiocarbamate, Zinc(II) bis(N,N-diisobutyldithiocarbamate), Zinc, bis(dibutylcarbamodithioato-S,S')-, Zinc, bis(dibutyldithiocarbamato)-, USAF GY-5, (T-4)-Bis(dibutylcarbamodithioato-kappas,kappas')zinc, Bis(dibutyldithiocarbamato)zinc, Dibutyldithiocarbamate zinc salt, Zinc bis(dibutyldithiocarbamate), Zinc bis(dibutyldithiocarbamoyl)disulfide, Zinc bis(dibutyldithiocarbamoyl)disulphide, Zinc bis(dibutylthiocarbamoyl)disulfide, Dibutyldithiocarbamic acid zinc salt, Zinc bis(dibutyldithiocarbamic acid), Zinc bis(dibutylthiocarbamoyl)disulphide, Zinc dibutyldithiocarbamic acid, Zinc di-N-butyldithiocarbamic acid, Butasan, Butazate, Butazin, Butyl Zimate, Butyl Ziram, Nocceler BZ, Soxinol, ZBC, ZDBC, Zinc bis(dibutyldithiocarbamate), Zinc N, N-dibutyldithiocarbamate, Butasan, Butazate, Butazin, Butyl Zimate, Nocceler BZ, Soxinol BZ, ZBC, Zinc dibutyldithiocarbamate, Zinc dibutyldithiocarbamate, 136-23-2, Zinc(II) Dibutyldithiocarbamate, Zinc bis(dibutyldithiocarbamate), zinc;N,N-dibutylcarbamodithioate, DTXSID0021462, Zinc, bis(dibutylcarbamodithioato-kappaS,kappaS')-, (T-4)-, DTXCID501462, Zinc, bis(dibutylcarbamodithioato-.kappa.S,.kappa.S')-, (T-4)-, CAS-136-23-2, Bis(dibutyldithiocarbamato)zinc, zinc bis(dibutylcarbamodithioate), HNM5J934VP, SCHEMBL35745, dibutyldithiocarbamate zinc salt, ZINCDIBUTYLDITHIOCARBAMATE, CHEMBL2373108, BOXSVZNGTQTENJ-UHFFFAOYSA-L, CHEBI:144323, NSC-3880, Tox21_113038, Tox21_202601, NSC-36548, AKOS015839728, zinc bis(dibutylthiocarbamoyl)disulfide, zinc bis(dibutyldithiocarbamoyl)disulfide, Dibutyldithiocarbamic Acid Zinc(II) Salt, NCGC00188440-01, NCGC00260149-01, zinc bis(dibutyldithiocarbamoyl)disulphide, ZINC DIBUTYLDITHIOCARBAMATE [INCI], CS-0152117, D0227, NS00079390, E81950, ZINC, BIS(DIBUTYLCARBAMODITHIOATO-S,S')-, ZINC, BIS(DIBUTYLDITHIOCARBAMATO)- [HSDB], (T-4)-bis(dibutylcarbamodithioato-kappaS,kappaS')zinc, Q27280015, NSC-36548
Zinc Dibutyldithiocarbamate is a dithiocarbamate salt that is the zinc salt of dibutyldithiocarbamic acid.
Zinc Dibutyldithiocarbamate has a role as an antifungal agrochemical.
Zinc Dibutyldithiocarbamate will prevulcanise latex; gives high modulus and transparency.
Zinc Dibutyldithiocarbamate has high solubility in rubbers.
Zinc Dibutyldithiocarbamate is a chemical compound that forms a complex with fatty acids.
Zinc Dibutyldithiocarbamate is found in reaction solutions, where it reacts with hydrochloric acid and boron nitride to form zinc diethyldithiocarbamate.
Zinc Dibutyldithiocarbamate is a vulcanization accelerator for natural rubber and latex and a stabilizer for rubber-based adhesive systems, isobutylene-isoprene copolymers and polypropylene.
Zinc Dibutyldithiocarbamate is used in a number of rubber and rubber-based materials for food packaging and food handling, e.g. conveyor belts.
Zinc Dibutyldithiocarbamate is contact allergens that cross-react in some individuals.
Zinc Dibutyldithiocarbamate, like many low-molecular-weight contact allergens, can only trigger an immune response when bound to a protein in the form of an immunogenic protein–hapten complex.
Haptenation of epidermally relevant skin proteins by Zinc Dibutyldithiocarbamate has not been reported despite the numerous studies on the disposition and systemic toxicity of Zinc dibutyldithiocarbamate.
Zinc Dibutyldithiocarbamate is one of numerous organometallic compounds manufactured.
Organometallics are useful reagents, catalysts, and precursor materials with applications in thin film deposition, industrial chemistry, pharmaceuticals, LED manufacturing, and others.
Zinc Dibutyldithiocarbamate is a white solid with a pleasant odor.
Zinc Dibutyldithiocarbamate is a white to cream-colored powder.
Zinc Dibutyldithiocarbamate is a dithiocarbamate salt that is the zinc salt of dibutyldithiocarbamic acid.
Zinc Dibutyldithiocarbamate has a role as an antifungal agrochemical.
Zinc Dibutyldithiocarbamate is a dermatological sensitizer and allergen.
Sensitivity to Zinc Dibutyldithiocarbamate may be identified with a clinical patch test.
Zinc Dibutyldithiocarbamate is a dithiocarbamate salt and a zinc molecular entity.
Zinc Dibutyldithiocarbamate contains a dibutyldithiocarbamate and a zinc(2+).
Zinc Dibutyldithiocarbamate is functionally related to a dibutyldithiocarbamic acid.
Zinc Dibutyldithiocarbamate is a dermatological sensitizer and allergen.
Sensitivity to Zinc Dibutyldithiocarbamate may be identified with a clinical patch test.
Zinc Dibutyldithiocarbamate is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 1 000 to < 10 000 tonnes per annum.
Zinc Dibutyldithiocarbamateis used as an activator and accelerator in natural and butyl rubber as well as in natural and synthetic latexes.
Zinc Dibutyldithiocarbamate is also used in rubber-based adhesive systems and as a stabilizer in cement.
Further research may identify additional product or industrial usages of Zinc Dibutyldithiocarbamate.
Uses of Zinc Dibutyldithiocarbamate:
Zinc Dibutyldithiocarbamate is used as an activator and accelerator in natural rubber synthetic latexes.
Zinc Dibutyldithiocarbamate is used Antidegradant, and accelerator, natural rubber, butadiene, styrene-butadiene, nitrile-butadiene, butyl rubber, ethylene-propylene-diene terpolymers.
Zinc Dibutyldithiocarbamate is used Antioxidant in rubber-based adhesive.
Zinc Dibutyldithiocarbamate is used condoms and diaphragms.
Zinc Dibutyldithiocarbamate is used cosmetic biocide for skin cleanser and odor prevention.
Zinc Dibutyldithiocarbamate is used gloves (household, work, or hospital).
Zinc Dibutyldithiocarbamate is used heavy rubber products used in industry.
Zinc Dibutyldithiocarbamate is used leather shoes (insoles, adhesives, and linings).
Zinc Dibutyldithiocarbamate is used medical devices.
Zinc Dibutyldithiocarbamate is used renal dialysis equipment.
Zinc Dibutyldithiocarbamate is used rubber in elasticized undergarments and clothing.
Zinc Dibutyldithiocarbamate is used rubber pillows and sheets.
Zinc Dibutyldithiocarbamate is used rubber shoes (sneakers, tennis shoes, and the like).
Zinc Dibutyldithiocarbamate is used sponge makeup applicators and rubber eyelash curlers.
Zinc Dibutyldithiocarbamate is used stabilizer in cement.
Zinc Dibutyldithiocarbamate is used swim wear.
Zinc Dibutyldithiocarbamate is used tires.
Zinc Dibutyldithiocarbamate is used Toys.
Zinc Dibutyldithiocarbamate belongs to the class of organic compounds known as organic transition metal salts.
These are organic salt compounds containing a transition metal atom in its ionic form.
Zinc Dibutyldithiocarbamate is used in Adhesives, Condoms and diaphragms, Disinfectants, repellents, fungicides, and insecticides.
Zinc Dibutyldithiocarbamate is used in agriculture, Gloves (household, work, or hospital), Heavy rubber products used in industry, and Leather shoes (insoles, adhesives, linings).
Zinc Dibutyldithiocarbamate is used medical devices, Renal dialysis equipment, Rubber in elasticized undergarments and clothing, Rubber pillows and sheets, Rubber shoes (sneakers, tennis shoes, etc.), Soaps and shampoos, Sponge makeup applicators and rubber eyelash curlers, Swim wear, and Tires and toys.
Zinc Dibutyldithiocarbamate is used as accelerator (rubber vulcanization, latex dispersions, and cements), ultra-accelerator for lubricating oil additives, and stabilizer in food packaging and handling.
Zinc Dibutyldithiocarbamate is used as an absorbent and sample preparation agent in uv spectroscopy.
Zinc Dibutyldithiocarbamate is used activator, antidegradant and accelerator for natural rubber, butadiene, styrene-butadiene, nitrile-butadiene, butyl rubber, and ethylene-propylene-diene terpolymers. ICU.
Zinc Dibutyldithiocarbamate is a widely used active secondary accelerator for dry rubber.
Zinc Dibutyldithiocarbamate can be used as a primary accelerator in latex.
Zinc Dibutyldithiocarbamate is used in NR, SBR, NBR, IIR, EPDM and latex industry.
Zinc Dibutyldithiocarbamate is used Chemical Synthesis, Plastic, Resin & Rubber, Accelerators, Antioxidants, Polymers, Stabilizer.
Zinc Dibutyldithiocarbamate is used by consumers, in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.
Zinc Dibutyldithiocarbamate is used in the following products: coating products and adhesives and sealants.
Other release to the environment of Zinc Dibutyldithiocarbamate is likely to occur from: indoor use as processing aid and outdoor use as processing aid.
Release to the environment of Zinc Dibutyldithiocarbamate can occur from industrial use: of articles where the substances are not intended to be released and where the conditions of use do not promote release.
Other release to the environment of Zinc Dibutyldithiocarbamate is likely to occur from: outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials) and indoor use in long-life materials with low release rate (e.g. flooring, furniture, toys, construction materials, curtains, foot-wear, leather products, paper and cardboard products, electronic equipment).
Zinc Dibutyldithiocarbamate can be found in products with material based on: rubber (e.g. tyres, shoes, toys), plastic (e.g. food packaging and storage, toys, mobile phones) and wood (e.g. floors, furniture, toys).
Zinc Dibutyldithiocarbamate is used in the following products: coating products.
Zinc Dibutyldithiocarbamate is used in the following areas: building & construction work.
Zinc Dibutyldithiocarbamate is used for the manufacture of: furniture.
Other release to the environment of Zinc Dibutyldithiocarbamate is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use as processing aid.
Zinc Dibutyldithiocarbamate is used in the following products: coating products, fillers, putties, plasters, modelling clay, polymers and adhesives and sealants.
Release to the environment of Zinc Dibutyldithiocarbamate can occur from industrial use: formulation of mixtures and formulation in materials.
Zinc Dibutyldithiocarbamate is used in the following products: adhesives and sealants, coating products and fillers, putties, plasters, modelling clay.
Zinc Dibutyldithiocarbamate is used in the following areas: building & construction work.
Zinc Dibutyldithiocarbamate is used for the manufacture of: rubber products, textile, leather or fur and machinery and vehicles.
Release to the environment of Zinc Dibutyldithiocarbamate can occur from industrial use: in processing aids at industrial sites, as processing aid and in the production of articles.
Release to the environment of Zinc Dibutyldithiocarbamate can occur from industrial use: manufacturing of the substance.
Zinc Dibutyldithiocarbamate is a vulcanization accelerator for natural rubber and latex and a stabilizer for rubber-based adhesive systems, isobutylene-isoprene copolymers, and polypropylene.
Keywords: di-n-Butyldithiocarbamic acid, zinc salt, Zinc, bis(dibutylcarbamodithioato-S,S')-, (T-4)-, bis(dibutyldithiocarbamato)-, Aceto zdbd, Bis(dibutyldithiocarbamato)zinc, Butazate, Butazate 50-D
Alternative Parents of Zinc Dibutyldithiocarbamate:
Organosulfur compounds
Organopnictogen compounds
Organonitrogen compounds
Hydrocarbon derivatives
Substituents of Zinc Dibutyldithiocarbamate:
Organic transition metal salt
Organic nitrogen compound
Organopnictogen compound
Hydrocarbon derivative
Organosulfur compound
Organonitrogen compound
Aliphatic acyclic compound
Handling And Storage of Zinc Dibutyldithiocarbamate:
Conditions for safe storage, including any incompatibilities:
Storage conditions:
Tightly closed.
Dry.
Stability And Reactivity of Zinc Dibutyldithiocarbamate:
Chemical stability:
Zinc Dibutyldithiocarbamate is chemically stable under standard ambient conditions (room temperature).
Possibility of hazardous reactions:
No data available
Conditions to avoid:
no information available
First Aid Measures of Zinc Dibutyldithiocarbamate:
General advice:
Show this material safety data sheet to the doctor in attendance.
If inhaled:
After inhalation:
Fresh air.
In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with water/ shower.
Consult a physician.
In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
Indication of any immediate medical attention and special treatment needed:
No data available
Fire Fighting Measures of Zinc Dibutyldithiocarbamate:
Suitable extinguishing media:
Water
Foam
Carbon dioxide (CO2)
Dry powder
Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
Further information:
Suppress (knock down) gases/vapors/mists with a water spray jet.
Prevent fire extinguishing water from contaminating surface water or the ground water system.
Accidental Release Measures of Zinc Dibutyldithiocarbamate:
Environmental precautions:
Do not let product enter drains.
Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.
Exposure Controls/Personal Protection of Zinc Dibutyldithiocarbamate:
Personal protective equipment:
Eye/face protection:
Use equipment for eye protection.
Safety glasses
Skin protection:
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min
Splash contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min
Body Protection:
protective clothing
Respiratory protection:
Recommended Filter type: Filter type P2
Control of environmental exposure:
Do not let product enter drains.
Identifiers of Zinc Dibutyldithiocarbamate:
MDL Number: MFCD00067274
EC Number: 205-232-8
PubChem CID: 5284483
IUPAC Name: Zinc; N,N-dibutylcarbamodithioate
SMILES: CCCCNC(CCCC)C(=S)[S-].CCCCNC(CCCC)C(=S)[S-].[Zn+2]
InChI Identifier: InChI=1S/2C9H19NS2.Zn/c21-3-5-7-10(9(11)12)8-6-4-2;/h23-8H2,1-2H3,(H,11,12);/q;;+2/p-2
InChI Key: BOXSVZNGTQTENJ-UHFFFAOYSA-L
Melting Point: 109°C
Color: White-Yellow
Quantity: 25 g
UN Number: 3077
Formula Weight: 474.12
Percent Purity: ≥98.0% (T)
Physical Form: Crystalline Powder
Chemical Name or Material: Zinc(II) Dibutyldithiocarbamate
Appearance: White powder (estimated)
Assay: 95.00 to 100.00
Food Chemicals Codex Listed: No
Melting Point: 104.00 °C @ 760.00 mm Hg (estimated)
Flash Point: 32.00 °F TCC (0.00 °C) (estimated)
CAS registration number: 136-23-2
Unique Ingredient Identifier: HNM5J934VP
Molecular formula: 2C9H18NS2.Zn
International Chemical Identifier (InChI): BOXSVZNGTQTENJ-UHFFFAOYSA-L
SMILES: C([S-])(=S)N(CCCC)CCCC.[Zn+2].C([S-])(=S)N(CCCC)CCCC
Formula: C18H36N2S4Zn
InChI: InChI=1S/2C9H19NS2.Zn/c21-3-5-7-10(9(11)12)8-6-4-2;/h23-8H2,1-2H3,(H,11,12);/q;;+4/p-2
InChIKey: UTKYIUWPTCDQSS-UHFFFAOYSA-L
Molecular Weight: 474.122 g/mol
SMILES: C(N(CCCC)C=1S[Zn]2(SC(N(CCCC)CCCC)=[S+]2)[S+]1)CCC
SPLASH: splash10-05fu-9610500000-14d9eea215477cd6b163
Source of Spectrum: JZ-1992-3347-0
Wiley ID: 1393219
Chemical Formula: C18H36N2S4Zn
Average Molecular Mass: 474.120 g/mol
Monoisotopic Mass: 472.105 g/mol
CAS Registry Number: 136-23-2
IUPAC Name: zinc(2+) ion bis((dibutylcarbamothioyl)sulfanide)
Traditional Name: zinc(2+) ion bis((dibutylcarbamothioyl)sulfanide)
SMILES Representation: [Zn++].CCCCN(CCCC)C([S-])=S.CCCCN(CCCC)C([S-])=S
InChI Identifier: InChI=1S/2C9H19NS2.Zn/c21-3-5-7-10(9(11)12)8-6-4-2;/h23-8H2,1-2H3,(H,11,12);/q;;+2/p-2
InChI Key: BOXSVZNGTQTENJ-UHFFFAOYSA-L
Properties of Zinc Dibutyldithiocarbamate:
Physical State: Powder
Color: White, off-white
Odor: Not available
Melting Point/Freezing Point:
Melting point/range: 104 - 108 °C
Initial Boiling Point and Boiling Range: 318 °C at 1.013 hPa
Flammability (Solid, Gas): Not available
Upper/Lower Flammability or Explosive Limits: Not available
Flash Point: Not available
Autoignition Temperature: Not available
Decomposition Temperature: Not available
pH: Not available
Viscosity:
Kinematic viscosity: Not available;
Dynamic viscosity: Not available
Water Solubility: 0.1 g/l at 25 °C - Insoluble
Partition Coefficient n-Octanol/Water (log Pow): 2.16 at 25 °C
Vapor Pressure: < 0.1 hPa at 25 °C
Density: 1.24 g/cm3 at 20 °C
Relative Density: Not available
Relative Vapor Density: Not available
Particle Characteristics: Not available
Explosive Properties: Not available
Oxidizing Properties: None
Other Safety Information: Not available
Molecular Weight: 474.1 g/mol
Hydrogen Bond Donor Count: 0
Hydrogen Bond Acceptor Count: 4
Rotatable Bond Count: 12
Exact Mass: 472.105276 g/mol
Monoisotopic Mass: 472.105276 g/mol
Topological Polar Surface Area: 72.7 Ų
Heavy Atom Count: 25
Complexity: 112
Isotope Atom Count: 0
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Covalently-Bonded Unit Count: 3
Compound Is Canonicalized: Yes
Compound Formula: C18H36N2S4Zn
Molecular Weight: 474.12 g/mol
Appearance: White to very pale yellow powder or crystals
Melting Point: 109°C
Boiling Point: Not applicable (N/A)
Density: Not applicable (N/A)
Solubility in H2O: Insoluble
Exact Mass: 472.105 g/mol
Monoisotopic Mass: 472.105 g/mol
Linear Formula: C18H36N2S4Zn