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Solvent Red 25 / CAS 3176-79-2

Short Description:

Solvent Red 25 is a yellowish red solvent dye, used for coloring for plastics, polymer, rubber, wax, oil, lubricant, fuel, gasoline, candle. Please check TDS of Solvent Red 25 below.

Product Detail

Product Tags

Color Index:             Solvent Red 25

C.I.No.                       26110

CAS                             3176-79-2

EC NO.                       221-647-7

Chemical Family      Azo Series

Chemical Formula   C24H20N4O

Technical Properties:

Solvent Red 25 is a yellowish red solvent dye, used for coloring for plastics, polymer, rubber, wax, oil, lubricant, fuel, gasoline, candle.

Color Shade


Application: (“” Superior, “” Applicable, “” Not recommend)













Physical Properties

Density(g/cm3) MeltingPoint() Light fastnessin PS Recommended Dosage
Transparent Nontransparent
1.28 150-155 5-6 0.01 0.05

Light Fastness: Consist of 1st to 8th grade, and the 8th grade is superior, the 1st grade is bad.

The heat resistance in PS can reach to 260

Degree of pigmentation: 0.05% dyes+0.1%titanium dioxide R

Solvent red 25 solubility in organic solvent at 20(g/l)

Acetone Butyl Acetate Methylbenzene Dichloromethane Ethylalcohol
19.4 17.9 23.5 48.9 6.9

Note: The above information is provided as guidelines for your reference only. The accurate effects should base on the test results in laboratory.


Customer Notification



Presol Dyes are comprised with a wide rage of polymer soluble dyes which can be used for coloring a wide variety of plastics. They are normally used via masterbatches and add into fiber, film and other plastic products.

When using Presol Dyes into engineering plastics with strict processing requirements, such as ABS, PC, PMMA, PA, only specific products are recommended.

When using Presol Dyes into thermo-plastics, we suggest to mix and disperse the dyes sufficiently together with the right processing temperature to achieve better dissolution. In particular, when using high melting point products, such as Presol R.EG (Solven Red 135), a full dispersion and suitable processing temperature will contribute to a better coloration.

High performance Presol Dyes are complaint with the global regulations in below applications:

●  Food packaging.

●  Food-contacted application.

●  Plastic toys.


QC and Certification

1)     Powerful R&D strength makes our technique in a leading level, with standard QC system meet EU standard requirements.

2)     We have ISO & SGS certificate. For those colorants for sensitive applications, such as food contact, toys etc., we can support with AP89-1, FDA, SVHC, and regulations according to EC Regulation 10/2011.

3)     The regular tests involve Color Shade, Color Strength, Heat Resistance, Migration, Weather Fastness, FPV(Filter Pressure Value) and Dispersion etc.

  • ● Color Shade test standard is according to EN BS14469-1 2004.
  • ● Heat Resistance test standard is according to EN12877-2.
  • ● Migration test standard is according to EN BS 14469-4.
  • ● Dispersibility test standard is according to EN BS 13900-2, EN BS 13900-5 and EN BS 13900-6.
  • ● Light/Weather Fastness test standard is according to DIN 53387/A.


Packing and Shipment

1)      Regular Packings are in 25kgs paper drum, carton or bag. Products with low density will be packed into 10-20 kgs.

2)      Mix and different products in ONE PCL, increase the working efficiency for customers.

3)      Headquartered in Ningbo or Shanghai, both are large ports which are convenient for us provide logistics services.

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