Perovion TMCH P29-40D is a powder-form organic peroxide containing 39.0–41.0% of 1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane (TMCH) dispersed on an inert carrier system. Upon thermal decomposition, it generates free radicals that drive crosslinking of rubber and polyolefin compounds at processing temperatures above 115°C. Perovion TMCH P29-40D delivers consistent crosslinking performance for EPDM, HNBR, POE, and polyolefin applications, combining the bifunctional TMCH radical mechanism with the handling convenience and dosing precision of a free-flowing solid powder format.
Key Features
- 40% TMCH on Inert Carrier in Powder Form: Perovion TMCH P29-40D is supplied as a free-flowing white powder with 39.0–41.0% active TMCH dispersed on an inert mineral carrier, delivering an active oxygen content of 4.13–4.34%. The solid carrier matrix promotes uniform distribution throughout rubber and polymer compounds and supports accurate gravimetric dosing in both manual and automated compounding workflows.
- Good Scorch Safety at 115°C: Rubber compounds containing Perovion TMCH P29-40D exhibit good scorch safety up to 115°C, with a rheometer ts2 exceeding 20 minutes under standard test conditions. This processing stability allows mixing, calendering, and pre-forming operations to proceed at elevated temperatures without risk of premature crosslinking, maintaining compound quality and flow properties throughout the production sequence.
- Reliable Crosslinking at 145°C: Perovion TMCH P29-40D activates at a typical crosslinking temperature of 145°C, with a rheometer t90 of approximately 12 minutes. This well-defined cure window supports consistent press-cure and oven-cure cycles for rubber and polyolefin compounds, delivering reproducible crosslink density and physical properties across production batches.
- Bifunctional TMCH Mechanism for Durable Network Formation: As a bifunctional peroxide, TMCH generates two reactive radical centers per molecule upon thermal decomposition, promoting dense and well-distributed crosslink networks in rubber and polymer matrices. Vulcanizates produced with Perovion TMCH P29-40D show good tensile strength, compression set resistance, and long-term heat aging stability, supporting performance in demanding sealing and structural rubber applications.
- Broad Rubber and Polyolefin Substrate Compatibility: Perovion TMCH P29-40D is effective for crosslinking EPDM, HNBR, POE, natural rubber, and other synthetic rubber types, as well as thermoplastic polyolefins. This substrate versatility allows compounders and polymer processors to apply a single crosslinking agent across multiple formulations and product lines, simplifying compound management and peroxide inventory.
Typical Applications
Perovion TMCH P29-40D is incorporated into rubber compounds in open-mill or internal mixer operations, where the inert carrier supports homogeneous distribution of the active TMCH throughout the elastomer matrix. Cure at approximately 145°C produces thermally stable vulcanizates with controlled crosslink density and good resistance to reversion. The peroxide cure system avoids sulfur-related discoloration, blooming, and off-gassing, making Perovion TMCH P29-40D well-suited for colored, transparent, and odor-sensitive applications as well as compounds requiring stable mechanical properties after long-term service at elevated temperatures.
End-use applications include EPDM and HNBR sealing compounds, gaskets, and molded parts for automotive, HVAC, and industrial fluid systems; POE elastomer crosslinking for flexible foam, film, and sheet; wire and cable insulation and jacketing compounds in polyolefin systems; heat-resistant industrial rubber goods including hoses, vibration mounts, and roller coverings; and thermoplastic polyolefin crosslinking for pipe, film, and specialty molded components requiring thermal stability and dimensional integrity in service.
Technical Specifications
- Chemical Type: 1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane (TMCH)
- Appearance: White to off-white free-flowing powder
- Active Content: 39.0–41.0%
- Total Active Oxygen: 4.13–4.34%
- Physical form: Solid powder (density not applicable)
- Safe Processing Temperature: 115°C (rheometer ts2 greater than 20 minutes)
- Typical Crosslinking Temperature: 145°C (rheometer t90 about 12 minutes)
- Self-Accelerating Decomposition Temperature (SADT): 60°C
- Maximum Storage Temperature: 30°C
Thermal Stability
- Organic peroxides are thermally unstable substances and must be handled with appropriate care.
- SADT: 60°C
Storage Recommendations
- Recommended maximum storage temperature: 30°C
- Store in a dry, well-ventilated area away from heat sources and direct sunlight.
- Keep containers tightly closed.
- Avoid contact with reducing agents, acids, alkalis, and heavy metal compounds.
Packaging & Transport
- Standard Packaging: To be confirmed based on the final specification sheet.
- Net Weight: To be confirmed based on the final specification sheet.
- UN Number: UN 3110
- Transport Class: Organic peroxide type F, solid; Class 5.2
Perovion TMCH P29-40D: Safety & Handling
Perovion TMCH P29-40D should be handled in accordance with applicable safety procedures for organic peroxides. Users are advised to review the Safety Data Sheet prior to handling and to implement appropriate personal protective equipment and engineering controls as specified therein.
Safety Data Sheet and destination-compliant labeling information are available upon request. For related products, see also Perovion TMCH L29 and Perovion DCP PBC.
Crosslinking Performance in Rubber and Polyolefin Systems
Perovion TMCH P29-40D delivers excellent scorch safety in rubber compounds, meaning processors gain a wider margin between mixing and the onset of premature crosslinking during extrusion or calendering. The bifunctional TMCH radical mechanism means each peroxide molecule can initiate two crosslinking events, supporting efficient dosing across EPDM, HNBR, and polyolefin elastomer systems while keeping the safe processing temperature at 115°C and typical crosslinking temperature at 145°C predictable across batches.
For formulators evaluating alternative peroxide carrier formats for similar TMCH-based or related bifunctional crosslinking chemistry, Perovion DBPH L14-85 offers a liquid mineral oil solution format that may better suit certain dosing and mixing equipment.
Precursor Chemistry: From Ketone to Peroxyketal
Perovion TMCH P29-40D is manufactured by reacting 3,3,5-trimethylcyclohexanone with tert-butyl hydroperoxide under acid catalysis, forming the bifunctional peroxyketal structure that gives TMCH its two independent oxygen-oxygen bonds per molecule. Because each molecule carries two peroxide linkages, a single TMCH molecule can initiate two separate radical events during decomposition, which is the underlying reason the grade supports efficient crosslinking at comparatively low active oxygen dosing versus mono-functional peroxides.
The finished peroxyketal is then dispersed onto an inert powder carrier at 40% active concentration, which is what allows Perovion TMCH P29-40D to be dosed by simple weighing and dry-blended directly into rubber or polyolefin compounds without the mixing equipment required for liquid peroxide formats.
Frequently Asked Questions
What does the “P29-40D” designation mean?
“29” refers to the TMCH (1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane) peroxide chemistry, “40” indicates the 40% active peroxide content, and “D” denotes the powder carrier format, distinguishing it from liquid dilutions of the same active ingredient.
Can Perovion TMCH P29-40D be used as a direct substitute for liquid TMCH peroxide?
The active chemistry is equivalent, but dosing must be recalculated for the 40% concentration and the powder carrier, and processors should confirm dispersion behavior in their specific mixing equipment since powder and liquid formats blend differently into rubber and polyolefin compounds.
How should Perovion TMCH P29-40D be stored to preserve shelf life?
Store below 30°C, away from direct sunlight and heat sources, in the original unopened packaging, and avoid contact with reducing agents, acids, and metal ion contaminants that can accelerate decomposition below the rated SADT of 60°C.
Which polymer systems is Perovion TMCH P29-40D best suited for?
It performs well across EPDM, HNBR, and polyolefin elastomer systems where a wide scorch safety margin and predictable crosslinking window between 115°C and 145°C are required.