Sigma-Aldrich FAQ: Allyl Bromide CAS 106-95-6, Methanol SDS, Nitric Acid, and the Everything DiSC Login Mix-Up

If you have ordered from Sigma-Aldrich for research, pharmaceutical, or industrial use, you have probably typed one of these questions into a search bar. I review chemical documentation and quality specifications before orders reach customers, and I get asked some version of these questions constantly. The short answers are below.

Questions I cover:

• What is Sigma-Aldrich allyl bromide CAS 106-95-6?
• Methanol Sigma-Aldrich SDS
• Autoignition temperature of methanol
• What metals does nitric acid dissolve?
• The Catalyst Everything DiSC login mix-up
• Why total cost matters in chemical buying

What is Sigma-Aldrich allyl bromide CAS 106-95-6?

Allyl bromide is the common name for 3-bromopropene, and its CAS registry number is 106-95-6. In the Sigma-Aldrich catalog, you may see it listed with the molecular formula C3H5Br. I tell customers to search by CAS number instead of the name alone, because allyl bromide sometimes appears in synthesis methods as 3-bromopropene, and a CAS search removes most of the confusion. Searching 'Sigma-Aldrich allyl bromide CAS 106-95-6' should lead to a product family with multiple package sizes and, in some cases, different purity grades. If your application is sensitive, compare the lot-specific certificate of analysis before you commit to a grade.

The reason the SDS matters here is not just safety paperwork. The classification affects how the chemical can be shipped, stored, and disposed of in your lab. Allyl bromide is flammable and a lachrymator, so I would look for that hazard information before opening the container, not after.

Methanol Sigma-Aldrich SDS: how do I get the current version?

Go to SigmaAldrich.com, search for 'methanol' or CAS 67-56-1, and open the product page. On the product page, the SDS/COA section is the official source for the current Safety Data Sheet. Older PDFs from other sites may not reflect the latest GHS classification or local regulatory statements. This is one of those cases where using the branded site is not just faster; it keeps you from inheriting outdated documentation.

For bulk or custom orders, the SDS will also carry the relevant product number and revision date. If a distributor sends you a methanol Sigma-Aldrich SDS that does not match the product number on the container, flag it before using the material.

What is the autoignition temperature of methanol?

The autoignition temperature of methanol is generally listed as 464 degrees Celsius (867 degrees Fahrenheit) in the Sigma-Aldrich SDS and standard references. That number is not a green light to ignore vapor hazards. Methanol has a flash point near 11-12 degrees Celsius closed cup, so it can form an ignitable mixture with air at common lab temperatures. The 464-degree figure is more relevant when you are thinking about hot surfaces, heaters, pumps, or other ignition sources that could trigger self-ignition without a spark or flame.

I am not a process engineer, and the exact autoignition test method can give slightly different values depending on pressure, vessel size, and oxygen concentration. If the question came up in a formal risk assessment, I would verify against the current SDS and the specific material safety study rather than relying on a single number.

What metals does nitric acid dissolve?

Nitric acid is an oxidizing acid, so the honest answer is: it depends on concentration, temperature, and the alloy. It readily attacks many common base metals, including zinc, copper, nickel, iron, and silver. In dilute nitric acid, the reactions often generate nitrate salts and nitrogen oxides. With aluminum and some stainless grades, concentrated nitric acid can form a passivating oxide layer that slows further attack, which is why industrial compatibility charts separate dilute and concentrated nitric acid.

Gold and platinum are not dissolved by nitric acid on its own; aqua regia, a mixture of nitric acid and hydrochloric acid, is a different story. For metal equipment, never choose a container or valve based on a two-line list like this one. Check the exact alloy, acid concentration, temperature, and potential contaminants against a proper corrosion table or test coupon.

Why do some searchers end up with a 'Catalyst Everything DiSC login' query?

This is the search question I have no chemistry answer for. Everything DiSC is a workplace assessment and training tool, and Catalyst is the online platform that hosts its reports. It is not a Sigma-Aldrich chemical, and it is not part of our catalog. My best guess is that people type 'catalyst' first, see a chemistry supplier in the results, and add 'everything disc login' because they are trying to reach the Wiley Everything DiSC portal. If that is you, you are looking for the Catalyst by Wiley website, not a Sigma-Aldrich SDS. On our side, customers log in at sigmaaldrich.com to manage orders, quotes, and product documentation.

Everything DiSC is a registered trademark of John Wiley & Sons, Inc., and is unrelated to Sigma-Aldrich. I have never fully understood why this search pairing is so common, but I would rather give a clear answer than let you click through three more pages.

How does total cost thinking apply to a Sigma-Aldrich chemical order?

If you are comparing suppliers, you are probably looking at unit price. That is a natural place to start, but it is rarely the full cost of a chemical order. From a quality perspective, I add in the cost of checking purity documentation, the risk of receiving a lot that does not meet method requirements, the time spent chasing an SDS or COA, and the labor cost if a batch has to be repeated.

In my years of reviewing chemical specs, I still remember a $30 price difference on a solvent that caused a QC run to fail because the lower-cost lot did not meet the absorbance spec. The rerun and investigation cost several hundred dollars in labor and lost time. I kick myself for not catching the difference in the paperwork before the purchase. That experience is why I now tell buyers: compare the full cost of getting the right material to the door, not just the price per liter.

That does not mean every application needs the most expensive grade. If your method is tolerant, a lower-priced grade may be perfectly fine. The point is to know the spec, check the documentation, and decide before a shipment arrives, not after a failed experiment.