Monostearin (CAS 31566-31-1): companion and pitfall notes for Rubber & Polymer Additives
A recent Rubber & Polymer Additives selection case got stuck on how to pair and compatibilise Monostearin (CAS 31566-31-1). Worth walking the logic through using that example.
Basic specifications
| Name | Monostearin |
|---|---|
| English name | Monostearin |
| CAS No. | 31566-31-1 |
| Formula | C21H42O4 |
| Molecular weight | 358.6 g/mol |
| Applications | Rubber & Polymer Additives |
| Standard purity | per batch COA |
| Packaging | confirmed per order |
| Storage | keep sealed in a cool, dry place |
Figures above are published / typical information; final values follow the batch COA and order confirmation.
Key physical data: molecular formula C21H42O4, molecular weight 358.6 g/mol, CAS 31566-31-1. These are published physical properties; purity and packaging follow the batch COA and order confirmation.
Let's get the mechanism first
This is the part that's most counter-intuitive:In Rubber & Polymer Additives, Monostearin (CAS 31566-31-1) usually acts as a modifier, vulcanising or functional additive, changing the processing window, mechanical behaviour or heat / ageing resistance. Polymer systems are sensitive to additive compatibility and thermal history; a small mismatch can cause voids, bleed-out or performance drop. Comparable grades:
- Glycerin 2-acetate (CAS 100-78-7)：a comparable grade often evaluated alongside。
- Glyceol (CAS 56-81-5)：a comparable grade often evaluated alongside。
- Glycerol resin (CAS 186374-50-5)：a comparable grade often evaluated alongside。
- Tricaprylin (CAS 538-23-8)：a comparable grade often evaluated alongside。
Key selection dimensions
- The one I weigh most: Confirm compatibility with the base polymer and the recommended dosing range to avoid phase separation or blooming.
- Watch thermal stability and the processing-temperature window to prevent decomposition, voids or discoloration.
- Run mechanical and ageing trials to verify the real contribution to tensile, hardness and heat resistance.
- Retain samples of critical lots and check batch-to-batch performance consistency.
Where most cases go wrong
Watching assay but ignoring compatibility: incompatibility causes bleed-out that hurts appearance and performance.
Ignoring thermal history: exceeding the decomposition point during processing creates voids or discoloration.
Skipping mechanical trials: whether performance actually improves should come from data, not feel.
Q&A
What does Monostearin do in Rubber & Polymer Additives?
As a modifier or functional additive it affects the processing window, mechanical behaviour or ageing resistance; the exact role depends on compatibility and dosing.
Which indicators should I confirm when sourcing Monostearin?
Beyond main assay, confirm base-polymer compatibility, thermal stability and recommended dosing, then validate by trial.
Can these materials be used directly in finished articles?
Products here are supplied for industrial and research use. Article use requires compatibility and performance validation plus applicable safety standards.
Related products worth a look
- Glycerin 2-acetate (CAS 100-78-7)
- Glyceol (CAS 56-81-5)
- Glycerol resin (CAS 186374-50-5)
- Tricaprylin (CAS 538-23-8)
See site search for Monostearin or browse the Organic Chemicals directory.
On supply and paperwork
Jinan Shenghe Chemical Co., Ltd. supplies chemical raw materials and fine chemicals; a COA ships with every batch, with MSDS and technical data sheets available on request. In your enquiry include product name, CAS, target purity and packaging, and we will provide documents and a quote to the relevant standard.
Contact: info@591daili.com | +86-18553102138
Note: This page is for industrial raw-material technical discussion only. Products are supplied for industrial and research use, not for consumer or medical use. Drinking-water, food, cosmetic or pharmaceutical applications must meet applicable regulations and customer standards; specifications, compliance documents and transport requirements follow the batch COA and order confirmation.