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651826

Chromium etchant

standard

Synonym(s):

Cr etching solution

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Pack SizeSKUAvailabilityPrice
500 mL
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$140.00

About This Item

UNSPSC Code:
12352300
NACRES:
NA.23
MDL number:
MFCD07370678

$140.00

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grade

standard

Quality Level

100

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.
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.
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.

Application

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.
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

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.

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Chromium etchant standard

Sigma-Aldrich

651826

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651834

Nichrome etchant

Gold etchant, standard

Sigma-Aldrich

651818

Gold etchant, standard

Aluminum Etchant Type D

Sigma-Aldrich

901545

Aluminum Etchant Type D

composition

volatiles, 85%

composition

volatiles, 85%

composition

volatiles, 50-80%

composition

-

density

1.16 g/mL at 25 °C

density

1.16 g/mL at 25 °C

density

1.2924 g/mL at 25 °C (lit.)

density

-

color

orange

color

clear yellow-orange

color

-

color

-

Quality Level

100

Quality Level

100

Quality Level

100

Quality Level

-

bp

100 °C/1 atm

bp

100 °C/1 atm

bp

100 °C (lit.), 100 °C/1 atm

bp

-

grade

standard

grade

standard

grade

-

grade

-

signalword

Danger

Hazard Classifications

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

supp_hazards

EUH071

Storage Class

5.1B - Oxidizing hazardous materials

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKDB1030
MKCX7416
MKCW6429
MKCV2641
MKCT6171

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Protocols

Negative Photoresist Procedure

Photoresist kit offers pre-weighed chemical components for lithographic processes, with separate etchants for various substrate choices.

Pressure-driven Fermi surface reconstruction of chromium
Stillwell RL, et al.
Physical Review, 88(12) (2013)
F J Alfaro-Mozaz et al.
Nature communications, 8, 15624-15624 (2017-06-08)
Polaritons in layered materials-including van der Waals materials-exhibit hyperbolic dispersion and strong field confinement, which makes them highly attractive for applications including optical nanofocusing, sensing and control of spontaneous emission. Here we report a near-field study of polaritonic Fabry-Perot resonances
Thermoelectric microconverter for energy harvesting systems.
Carmo J, et al.
IEEE Transactions on Industrial Electronics, 57(3), 861-867 (2010)
View All Related Papers

Global Trade Item Number

SKUGTIN
651826-500ML04061832732657

Questions

1–4 of 4 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf

      Helpful?

  2. At which rate does this etchant etch Chromium Surfaces and Chromium Oxide, as well? Is it 4mm/s, or 40 Å/s?

    1 answer

    1. The product etches Chromium and Chromium Oxide at a rate of 40 Å/s.

      Helpful?

  3. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

  4. Does this product etch Ti and TiO2? If so, what is the etch rate?

    1 answer

    1. The chromium etchant, product 651826, is compatible with titanium, meaning it does not etch titanium. While there is no specific information on TiO2, it is assumed that the same is true. The etch rate at 40°C is 40 Å/sec, and the rate will approximately double with every 10°C increase in temperature. Additionally, the rate of stirring or agitation will also increase the etch rate.

      Helpful?

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