United Initiators DCLBP-50-PSI Di(2,4-dichlorobenzoyl) peroxide 133-14-2

• Product Name: DCLBP-50-PSI (Di(2,4-dichlorobenzoyl) peroxide)
• CAS Number: 133-14-2
• Concentration: 50% slurry (in silicone oil)
• Molecular Weight: 380.0 g/mol
• Appearance: White paste
• Main Ingredient: Approximately 50% di(2,4-dichlorobenzoyl) peroxide, desensitized with silicone oil
• Application: Used as an initiator for polymer cross-linking, particularly in silicone rubber (VMQ)

• Appearance: White paste
• Peroxide content: Approximately 50% w/w
• Active oxygen: Approximately 2.10% w/w
• Deactivator: Silicone oil
• Density (20°C): approx. 1.2 g/cm³
• General Characteristics: Hard paste
• Critical temperature (SADT): approx. 60°C
• Refrigerated stability: Freezing point below -25°C
• Recommended storage temperature: Below 30°C
• Storage Stability (Activity): 6 months from date of delivery
• Compliant with ElektroG (EU Directives: RoHS 2002/95/EG, WEEE 2002/96/EG)

• 10 h/1 h/1 min (0.1 m/benzene): 54/72/110°C

• Polymer crosslinking: Used as a peroxide crosslinking agent for polymers, particularly silicone rubber (VMQ).
• Crosslinking temperature: Above 100°C; no premature crosslinking (scorching) occurs below 60°C.
• Usage: Mix 1–2% of the supplied product into the material to be crosslinked. A paste form facilitates mixing and homogenization.
• Crosslinking is not inhibited by oxygen but is sensitive to carbon black; polychlorinated biphenyls (PCBs) may be formed during the crosslinking process.
• Crosslinking of silicone rubber can be carried out under pressure within the temperature range of 110–130°C. Subsequent post-crosslinking can be performed at 150–250°C for 12–24 hours to remove acidic degradation products and improve aging resistance.
• In continuous systems, crosslinking can also be performed at atmospheric pressure using hot air at temperatures ranging from 150–400°C. This method produces bubble-free vulcanized rubber.
• Approved by the FDA (§ 177.2600) and BGVV (XV/3) for the cross-linking of silicone rubber.

• Standard packaging is 20 kg plastic drums.

• The information and technical recommendations provided are based on internal testing of local raw materials and are intended to introduce the product and its applications.
• The information does not guarantee any specific performance or suitability of the product, nor does it provide complete instructions for use.
• The information does not guarantee the product’s specific performance or shelf life characteristics, nor does it assume legal liability for intellectual property rights, particularly patent rights.
• We reserve the right to make any changes based on technical progress or further development.
• Product applications and uses based on technical recommendations are beyond our control and are the sole responsibility of the user. The user is obligated to conduct thorough inspections and tests to verify that the product is suitable for the intended application.

Crosslinking Performance Data

Influence of Temperature on Crosslinking

Vulcanisation of VMQ (Wacker R 401/60-U) with 1.5% DCLBP-50-PSI / 0.03% AO (Monsanto rheometer 100-S, torsion angle 1°, chamber volume 7.3 cm³):

Influence of Peroxide Level on Vulcanisate Properties (at 110°C)

Half-life data: 10 h / 1 h / 1 min (0.1 m in benzene): 54 / 72 / 110 °C

FDA approval: Approved for crosslinking of silicone rubber under FDA § 177.2600 and BGVV (XV/3).