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
331635
Tetramethylammonium hydroxide solution
25 wt. % in H₂O, solution
Synonym(s):
TMAH solution
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
250 mL | Available to ship TODAYfromMILWAUKEE | $93.70 |
1 L | Available to ship TODAYfromMILWAUKEE | $221.00 |
About This Item
$93.70
Available to ship TODAYDetails
Product Name
Tetramethylammonium hydroxide solution, 25 wt. % in H2O
vapor pressure
17.5 mmHg ( 20 °C)
Quality Segment
form
liquid
reaction suitability
core: ammonium
concentration
25 wt. % in H2O
refractive index
n
pH
>13 (20 °C)
solubility
water: soluble
density
1.016 g/mL at 25 °C
functional group
amine
SMILES string
[OH-].C[N+](C)(C)C
InChI
1S/C4H12N.H2O/c1-5(2,3)4;/h1-4H3;1H2/q+1;/p-1
InChI key
WGTYBPLFGIVFAS-UHFFFAOYSA-M
General description
Application
1 of 1
This Item | |||
|---|---|---|---|
| description 25 wt. % in H2O | description ~25% in H2O (1.68 M) | description ACS reagent | description 35 wt. % in H2O |
| concentration 25 wt. % in H2O | concentration ~25% in H2O (1.68 M) | concentration 1.0 M±0.02 M in H2O | concentration 35 wt. % in H2O |
| Quality Level 200 | Quality Level 100 | Quality Level 200 | Quality Level 100 |
| form liquid | form liquid | form liquid | form liquid |
| solubility water: soluble | solubility - | solubility - | solubility - |
| pH >13 (20 °C) | pH - | pH - | pH - |
| refractive index n | refractive index n | refractive index n | refractive index n |
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signalword
Danger
Hazard Classifications
Acute Tox. 1 Dermal - Acute Tox. 2 Oral - Aquatic Chronic 2 - Eye Dam. 1 - Skin Corr. 1B - STOT RE 1 Dermal - STOT SE 1
target_organs
Central nervous system, Liver,thymus
Storage Class
6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter
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How can I determine the shelf life / expiration / retest date of this product?
1 answer-
Helpful?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
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?
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Hi Can I ask if this 25% TMAH in water (331635) is ultra pure or analytical grade? Thanks
1 answer-
This product is not tested or recommended for a specific application and is intended for general research use. The material is tested to verify concentration only. Please see the link below to review a sample or lot specific Certificate of Analysis:
https://www.sigmaaldrich.com/product/sial/331635#product-documentationHelpful?
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