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structure of 7440-21-3

Silicon(CAS 7440-21-3)

CAS No.: 7440-21-3 Brand: MolBest
M. Ft.: Si Cat. No: G4484612
M. Wt.: 28.09 MDL: MFCD00085311
Storage: Store in a cool,dry area. Use: For laboratory research use only
HS CODE: 2804690000 UN No.: UN 2922 8 /PG II
Purity Grade Package Stock Price Quantity
99.9% metals basis,100-200nm
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Extra Pure 250MG In Stock 3 USD
99.9% metals basis,100-200nm
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Extra Pure 1G In Stock 4 USD
99.9% metals basis,100-200nm
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Extra Pure 5G In Stock 11 USD
99.9% metals basis,100-200nm
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Extra Pure 25G In Stock 42 USD
99.9% metals basis,100-200nm
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Extra Pure 100G In Stock 159 USD
99.9% metals basis,1μm
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Extra Pure 1G In Stock 4 USD
99.9% metals basis,1μm
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Extra Pure 5G In Stock 4 USD
99.9% metals basis,1μm
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Extra Pure 25G In Stock 13 USD
99.9% metals basis,1μm
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Extra Pure 100G In Stock 40 USD
99.9% metals basis,1μm
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Extra Pure 500G In Stock 180 USD
99.9% metals basis,20-60nm
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Extra Pure 1G In Stock 9 USD
99.9% metals basis,20-60nm
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Extra Pure 5G In Stock 38 USD
99.9% metals basis,20-60nm
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Extra Pure 25G In Stock 134 USD
99.9% metals basis,20-60nm
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Extra Pure 100G In Stock 469 USD
99.9% metals basis,200-800nm
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Extra Pure 25G In Stock 27 USD
99.9% metals basis,200-800nm
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Extra Pure 100G In Stock 90 USD
99.9% metals basis,200-800nm
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Extra Pure 500G In Stock 430 USD
99.9% metals basis,200-800nm
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Extra Pure 2.5KG In Stock 1954 USD
99.9% metals basis,60-100nm
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Extra Pure 1G In Stock 7 USD
99.9% metals basis,60-100nm
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Extra Pure 5G In Stock 19 USD
99.9% metals basis,60-100nm
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Extra Pure 25G In Stock 91 USD
99.9% metals basis,60-100nm
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Extra Pure 100G In Stock 347 USD
99.9% metals basis,60-100nm
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Extra Pure 500G In Stock 1664 USD
99.9%,1-3μm
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Extra Pure 5G In Stock 7 USD
99.9%,1-3μm
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Extra Pure 25G In Stock 20 USD
99.9%,1-3μm
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Extra Pure 100G In Stock 62 USD
99.9%,1-3μm
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Extra Pure 500G In Stock 299 USD
99.9%,1-3μm
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Extra Pure 2.5KG In Stock 1435 USD
99.9%,400 mesh
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Extra Pure 25G In Stock 5 USD
99.9%,400 mesh
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Extra Pure 100G In Stock 12 USD
99.9%,400 mesh
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Extra Pure 500G In Stock 43 USD
99.9%,400 mesh
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Extra Pure 2.5KG In Stock 190 USD
99.9%,400 mesh
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Extra Pure 10KG In Stock 722 USD
99.99% metals basis,1-3mm
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Extra Pure 25G In Stock 9 USD
99.99% metals basis,1-3mm
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Extra Pure 100G In Stock 24 USD
99.99% metals basis,1-3mm
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Extra Pure 500G In Stock 77 USD
99.99% metals basis,1-3mm
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Extra Pure 2.5KG In Stock 368 USD
99.99% metals basis,1-3mm
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Extra Pure 10KG In Stock 1399 USD
99.99% metals basis,40-200mesh
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Extra Pure 5G In Stock 5 USD
99.99% metals basis,40-200mesh
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Extra Pure 25G In Stock 7 USD
99.99% metals basis,40-200mesh
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Extra Pure 100G In Stock 15 USD
99.99% metals basis,40-200mesh
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Extra Pure 500G In Stock 62 USD
99.99% metals basis,40-200mesh
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Extra Pure 2.5KG In Stock 297 USD
99.99% metals basis,40-200mesh
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Extra Pure 10KG In Stock 1129 USD
99.99%,300mesh
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Extra Pure 5G In Stock 3 USD
99.99%,300mesh
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Extra Pure 25G In Stock 6 USD
99.99%,300mesh
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Extra Pure 100G In Stock 15 USD
99.99%,300mesh
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Extra Pure 500G In Stock 53 USD
99.99%,300mesh
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Extra Pure 2.5KG In Stock 249 USD
99.99%,300mesh
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Extra Pure 25KG In Stock 2388 USD
Crystalline, -100 mesh, 99.9% (metals basis)
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Extra Pure 25G In Stock 38 USD
Crystalline, -100 mesh, 99.9% (metals basis)
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Extra Pure 100G In Stock 113 USD
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Applications of 7440-21-3

Silicon has diverse applications across various industries:

  • Semiconductors: Silicon is the backbone of modern electronics, used extensively in transistors, diodes, and integrated circuits due to its favorable electrical properties.
  • Solar Cells: Photovoltaic cells often utilize crystalline silicon for converting solar energy into electricity, making it a key material in renewable energy technologies.
  • Construction Materials: Silica is a major component of concrete and glass production, while silicon compounds are used in ceramics and abrasives.
  • Silicones: These synthetic polymers derived from silicon have applications ranging from lubricants and sealants to medical devices due to their thermal stability and chemical resistance.

Physical and chemical properties of 7440-21-3

Boiling Point

4271 °F

Density

(77 °F): 2.33

Exact Mass

27.98000

Exposure Limits

ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3

Melting Point

2570 °F

Merck

13,8565

Molecular Formula

Si

Molecular Weight

28.09000

Odor

Odorless

pH

13.5 (H2O, 20°C)

Sensitivity

Air Sensitive

Solubility

Insoluble

Stability

Stable. Fine powder is highly flammable. Incompatible with oxidizing agents, bases, carbonates, alkali metals, lead and aluminium oxides, halogens, carbides, formic acid.

Storage condition

Flammables area

Vapour Pressure

0 mmHg (approx)

Water Solubility

INSOLUBLE

Retrosynthesis analysis of 7440-21-3


Q&A for CAS 7440-21-3

1. How can I verify product quality?
Every batch of our Chemical Reagents is tested to meet ISO 9001 standards. We provide COA & NMR & SDS Provided with each shipment. Batch COA available for verification, and third-party retesting is supported. A full refund is offered if our data is incorrect.

2. What is the delivery time?
Orders from Ready stock / In stock items typically Ships Tomorrow via Fast Shipping via FedEx/DHL/UPS. International deliveries usually arrive within 7 business days, subject to customs clearance.

3. What if the received product doesn’t meet quality standards?
If your Lab Grade Chemical Reagents do not match the Batch COA available, we will issue a replacement or a full refund upon verification.

4. Are hazardous labels included? How is safe shipping ensured?
Hazardous products are labeled and packaged following international regulations. We provide SDS Provided with all hazardous shipments to ensure safe and compliant transport.

5. Do you offer technical support?
Yes. Our Lab Supplier team is available to assist with questions about product usage, storage, Lab Grade requirements, applications, and more.

6. Are volume discounts available?
Yes. For bulk orders of Chemical Reagents, we offer competitive pricing. Submit a quotation request and we’ll provide a tailored offer.

7. Do you provide samples?
Yes, samples are available for selected Lab Grade products. Please submit a request to confirm availability and specifications.

8. Do you have products in stock?
Yes. Items labeled In stock / Ready stock on our website are available for immediate shipment, usually within 1–2 business days. Large packs or custom specifications require lead time confirmation.

9. Can you customize purity or packaging?
Yes. We support customization of Lab Grade purity, packaging size, and special testing requirements. Share your needs and we’ll provide a tailored solution.

10. Is the COA consistent with the shipped batch?
Yes. Batch COA available matches the actual shipment. COAs shown online are for reference or from previous batches.

11. Do you support long-term supply agreements?
Yes. We offer Lab Supplier services for stable batch consistency, pricing agreements, and safety stock for long-term customers to ensure uninterrupted supply.

12. What payment methods do you accept?
We accept Pay Local Currency via bank transfer (T/T), PayPal, and other methods. Credit terms are available for qualified long-term partners.

Download SDS of 7440-21-3

Pictograms

Signal Word

Danger

Hazard Statements

H228 Flammable solid
H320 Causes eye irritation

Safety Data Sheet

Operate under the ISO 9001 system