MilliporeSigma
All Photos(1)

Documents

651826

Sigma-Aldrich

Chromium etchant

standard

Sign Into View Organizational & Contract Pricing

MDL number:
NACRES:
NA.23

grade

standard

Quality Level

composition

volatiles, 85%

color

orange

bp

100 °C/1 atm

density

1.16 g/mL at 25 °C

General description

  • Appearance - Clear orange
  • pH - Acidic
  • Etch Rate at 40 °C - 40 Å/second
  • Etch Capacity (rate declines at ~70%) - 65 g/gallon
  • Shelf Life - 1 year
  • Storage Conditions - Ambient
  • Filtration - 0.2 µm
  • Recommended Operating Temperatures - 20-80 °C (30-40 °C most common)
  • Rinse - Deionized water
  • Photoresist Recommendations - KLT6000 Series, KLT 5300 Series, HARE SQT (SU-8 type), TRANSIST, or PKP -308PI
  • Select Compatible Materials - Au, Ti, oxide, nitride, Si
  • Select Incompatible Materials - Al, Ni, Cu, NiCr
  • Compatible Plastics - HDPE, PP, PTFE, PFA, PVC
  • Isotropy - Isotropic
  • Incompatible Chemicals - Strong bases
Ceric ammonium nitrate-based etchant. Etch rate of 40 Å/sec @ room temp. Etches cleanly with only a deionized water rinse needed.
Chromium etchant is a chromium based solution that removes the excess metal from the substrate. These etchants are majorly used in metal finishing and electronic industry. It has an etch rate of 4 mm/s and can be used to etch nickel, copper, and chromium based excess metals.
Our chromium etchant is high purity ceric ammonium nitrate system for precise, clean etching of chromium and chromium oxide films. Compatible with positive and negative photoresists. Our chromium etchant is filtered to remove all particulates above 0.2 microns. Etching temperature varies depending on film thickness. Etch times range from 15 seconds to 60 seconds at room temperature. Chromium Etchants should be operated in a well-ventilated hood.

Application

The product can etch Al, Cr, Cu, Ni, GaAs. It can surface oxidize Si, Ta/TaN, however, it has no effect on Au, Si3N4, SiO2, Ti, and W surfaces
For use at room temperature or elevated temperature. Etches cleanly, eliminating need for an intermediate rinse. Etching temperature varies with regard to film thickness. Etch times range from 15 to 60 seconds at room temperature. Note, chromium etchants should be handled in a well ventilated hood.

Features and Benefits

Designed for precise, clean etching of chromium and chromium oxide films. Compatible with both positive and negative photoresists. Filtered to 0.2 micron to remove particlulates.

signalword

Danger

Hazard Classifications

Aquatic Chronic 2 - Eye Dam. 1 - Met. Corr. 1 - Ox. Liq. 2 - Skin Corr. 1B - Skin Sens. 1

supp_hazards

Storage Class

5.1B - Oxidizing hazardous materials

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Documents related to the products that you have purchased in the past have been gathered in the Document Library for your convenience.

Visit the Document Library

Difficulty Finding Your Product Or Lot/Batch Number?

Product numbers are combined with Pack Sizes/Quantity when displayed on the website (example: T1503-25G). Please make sure you enter ONLY the product number in the Product Number field (example: T1503).

Example:

T1503
Product Number
-
25G
Pack Size/Quantity

Additional examples:

705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

1000309185

enter as 1.000309185)

Having trouble? Feel free to contact Technical Service for assistance.

Lot and Batch Numbers can be found on a product's label following the words 'Lot' or 'Batch'.

Aldrich Products

  • For a lot number such as TO09019TO, enter it as 09019TO (without the first two letters 'TO').

  • For a lot number with a filling-code such as 05427ES-021, enter it as 05427ES (without the filling-code '-021').

  • For a lot number with a filling-code such as STBB0728K9, enter it as STBB0728 without the filling-code 'K9'.

Not Finding What You Are Looking For?

In some cases, a COA may not be available online. If your search was unable to find the COA you can request one.

Request COA

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service