Delayering: component of standard wet etch. Used as a dillutant in preference over H2O, so vinegar isn't of much use.

General cleaning

Delayering: buffered oxide etching (BOE) buffer salt

Delayering: component of various wet etch solutions

Delayering: Wright etch

Delayering: reduces insoluble products in buffered oxide etching (BOE)

Delayering: component of all wet etches Can be stored in polymethylpentene (PMP), polyethylene (PE), and Teflon (PTFE). [Isotropic Silicon Etching using HF/Nitric/Acetic Acid (HNA)] ~2.5% HF solution can be found in Whink brand rust remover. Unfortunately, due to health concerns with HF, this product is not sold in the EU. You still might be able to order it from somewhere overseas (ie eBay) cheap enough.

HF is notably toxic

General cleaning

Decapsulation. Info on making: hno3

Delayering: Secco etch

Decapsulation: usually bare die, especially for tough epoxies

Silicon etchant, maybe useful for delayering

TMAH poisoning study https://snf.stanford.edu/SNF/materials-and-chemicals/msds-std-chemicals/liquid/tetramethylammonium-hydroxide-tmah/TMAH.PDF/at_download/file

General cleaning

1. Isotropic Silicon Etching using HF/Nitric/Acetic Acid (HNA): http://engineering.tufts.edu/microfab/index_files/SOP/SiliconEtch_HNA_SOP.pdf

• MSDS: http://msds.dupont.com/msds/pdfs/EN/PEN_09004a2f801b4efc.pdf
• Health: 4
• Flammability: 0
• Instability/reactivity: 2
• Other: corrosive

WARNING: probably the most dangerous chemical you might encounter for this work. Suggest use of fully body protection including gloves, acid gas respirator, and frontal protection. Contact can include causing excruciating pain from dissolving bones, severe burns, cardiac arrest, and more. It may be useful to keep calcium gluconate (2.5% gel) handy to increase chance of survival in case of contact. Seek IMMEDIATE medical attention. It is unknown how over the counter HF from Whink rust remover compares to concentrate in terms of necessary safety precautions.

• MSDS: http://www.jtbaker.com/msds/englishhtml/n3660.htm
• Health: 4
• Flammability: 0
• Instability/reactivity: 0
• Other: oxidizer
• Causes severe burns.

• MSDS: http://www.jtbaker.com/msds/englishhtml/s8234.htm
• Health: 3
• Flammability: 0
• Instability/reactivity: 2
• Other: reactive to water
• Causes severe burns.

• MSDS: http://www.jtbaker.com/msds/englishhtml/h4065.htm
• Health: 3
• Flammability: 0
• Instability/reactivity: 2
• Other: oxidizer
• Strong oxidizer. Even low concentrations can be dangerous when mixed with certain chemicals.

1. http://en.wikipedia.org/wiki/Hydrofluoric_acid
2. http://en.wikipedia.org/wiki/Nitric_acid
3. http://en.wikipedia.org/wiki/Sulfuric_acid
4. http://en.wikipedia.org/wiki/Hydrogen_peroxide