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Trigonox® 121 can be used to initiate the (co)polymerization of acrylates and methacrylates in the temperature range between 70°C and 120°C. Trigonox® 121 can be applied in suspension as well as in solvent and bulk polymerization. Trigonox® 121 can also be used for the copolymerization of styrene and acrylonitrile and for vinyl acetate based copolymers.
Trigonox 121 is tert-amyl peroxy-2-ethylhexanoate (TAPEH, CAS 686-31-7), a perester initiator from Nouryon with an assay of at least 95 %. In polymer production it initiates the (co)polymerization of acrylates and methacrylates between 70 °C and 120 °C in suspension, solvent and bulk processes, and it is also used for styrene-acrylonitrile and vinyl acetate copolymers.
In thermoset composites it cures UP-based hot press moulding compounds such as BMC and DMC at 120–160 °C, alone or as a kicker together with a less reactive peroxide such as Trigonox C. Trigonox 121 must be stored refrigerated and shipped under temperature control. For more background, read our article on TAPEH in BMC/SMC curing. See all grades in the organic peroxide range.
| Property | Value |
| Chemical name | tert-Amyl peroxy-2-ethylhexanoate (TAPEH) |
| CAS number | 686-31-7 |
| Molecular weight | 230.3 |
| Appearance | Clear liquid |
| Assay | ≥ 95.0 % |
| Active oxygen | 6.60–6.95 % |
| Hydroperoxides (as TAHP) | ≤ 0.20 % |
| SADT | 35 °C |
| Control / emergency temperature (Tc / Te) | 20 °C / 25 °C |
| Maximum storage temperature (Ts max) | 5 °C |
| Transport classification | Organic peroxide type D, liquid, temperature controlled; Division 5.2; UN 3115 |
| Standard packaging | 30 L HDPE can, 25 kg net |
| Shelf life | At least 3 months after delivery when stored as recommended |
The Trigonox 121 product data sheet (TDS/PDS) lists specifications, thermal stability data and storage limits. The safety data sheet (SDS/MSDS) covers hazard classification, transport and emergency measures. English documents can be downloaded below; Chinese versions are available on request.
- Acrylics: (co)polymerization of acrylates and methacrylates at 70–120 °C in suspension, solvent and bulk processes.
- Styrene and vinyl acetate copolymers: copolymerization of styrene with acrylonitrile, and vinyl acetate based copolymers.
- BMC and DMC hot press moulding: cure of UP compounds at 120–160 °C, alone or as a kicker with a low-reactivity peroxide such as Trigonox C.
Store Trigonox 121 refrigerated, at or below 5 °C, in tightly closed original containers. Its SADT is only 35 °C, so it is transported under temperature control with a control temperature of 20 °C and an emergency temperature of 25 °C. Keep it away from heat, ignition sources, reducing agents such as amines, acids, alkalis and heavy metal compounds, and never weigh it out in the storage room.
Q: What is Trigonox 121?
A: Trigonox 121 is Nouryon's tert-amyl peroxy-2-ethylhexanoate (TAPEH), CAS 686-31-7, with an assay of at least 95 %. It initiates acrylate and methacrylate polymerization and cures BMC and DMC moulding compounds.
Q: At what temperature is Trigonox 121 used?
A: It initiates acrylate and methacrylate polymerization at 70–120 °C and cures UP hot press moulding compounds at 120–160 °C.
Q: Why must Trigonox 121 be refrigerated?
A: Its SADT is 35 °C, so it must be stored at or below 5 °C and transported under temperature control, with a control temperature of 20 °C and an emergency temperature of 25 °C.
Q: Can Trigonox 121 be combined with Trigonox C?
A: Yes. In BMC and DMC it can be used alone or as a kicker together with a low-reactivity peroxide such as Trigonox C.
Q: Where can I get the Trigonox 121 TDS and SDS?
A: The English product data sheet and safety data sheet can be downloaded on this page. Send an inquiry for Chinese versions.
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