White Solid 3, 3-Diphenyl-3h-Benzo[F]Chromene C25h18o 4222-20-2

• Customization: Available
• CAS No.: 4222-20-2
• Formula: C25h18o
• Model NO.: 99%
• Usage: Paints, Paper, Ink
• Colour: White, Green, Yellow, Purple, Brown, Red, Black, Orange, Blue
• Application Material: Wool
• Appearance: Powder
• Type: Natural
• Specification: 98% min
• Trademark: SWC
• Origin: China
• Production Capacity: 200mts/Month

Product Description

Product Name: 3,3-Diphenyl-3H-benzo[f]chromene
Identification
Synonyms 3,3-Diphenyl-3H-naphtho[2,1-b]pyran
Molecular Formula C25H18O
Molecular Weight 334.41
CAS Number 4222-20-2

Properties
Appearance Pink crystalline powder
Melting Point 160 ºC
Stability Stable under ordinary conditions.

Specification

Item	Specification
Appearance	Off-white solid
Structure Identification	NMR: 400MHz1H-NMR
MS: LC-MS
Purity (HPLC)	98.0% min

Application
It is used as photochromic dye, which is a series, they are special small molecular materials which
change color under ultraviolet light. These dyes also change color excellently under the sun. Its
mechanism of color-change stems from the fact that the dye is excited by ultraviolet light, the molecular structure changes, thus resulting in color changes, and when ultraviolet light is removed, the molecular structure of the dye returns to its original colorless state. Photochromic dye are available in a variety of colors, such as purple, blue, yellow, pink, green, and so on, which can be mixed with different color dyes to effect more diverse color changes, such as red, brown, gray.

Packing and Storage

Packing	In 25kgs net cardboard drum, or smal packages as required.
Storage	Store in cool place. Keep container tightly closed in a dry and well-ventilated place.

Safety Information
Non-hazardous for air, sea and road freight.
Detailed safety information is contained in each Material Safety Data Sheet, which can be obtained from our company.



Frequently Asked Questions

Q1: May I get one sample before placing order?
Re: Yes, Sample are available. For normal products, samples are for free and you just need to bear the freight; For those high value products, you just need to freight and certain product cost. When we both cooperate for some times or when you are our VIP customer, free sample will be offered when you need.

Q2: Which payment is available for your company?
Re: T/T, L/C or Alibaba trade insurance. You can choose the one which is convenient for you. 

Q3: How and when can I get my goods after payment?
Re: For small quantity products, they will be delivered to you by international courier(DHL, FedEx, TNT etc.) or by air. Usually it will cost 3-5days that you can get the goods after delivery.For large quantity products,shipping by see is worthwhile.It will cost days to weeks to come to your destination port, which depends on where the port
 is.

Q4: Is there any possible to use my appointed label or package?
Re: Yes. If needed, we'd like to use label or package according to your requirement. 

Q5: How can you guarantee the goods you offer is qualified? 
Re: We always believe honesty and responsibility are basis of one company, so whatever products we provide for you all are qualified. We will have goods tested and provide COA before delivery for sure.