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Perkadox®14-40B-pd 1440B-Curing Agent for ubber

Product Name: Crosslinking Agent for Rubber

Other Names: curing agent, curing ingredient,vulcanizing agent,vulcanizater  

crosslinking agent, cross linking agent, bridging agent

accelerant, accelerating agent, accelerator, cure accelerator for silicone rubber

Item NO.: Silibase-1440B

Equivalent Product: Perkadox®14-40B-pd


Product description

Di(tert-butylperoxyisopropyl)benzene, powder 

40% with calcium carbonate and silica

Molecular weight:                            338.5 

Active oxygen content peroxide:                 9.45% 

actual product :                               3.7-3.9% 

CAS No. :                                   25155-25-3 

EINECS/ELINCS No. :                        246-678-3 

TSCA status :                                listed on inventory 

Silibase-1440B is a bifunctional peroxide formulation which is used for the crosslinking of natural 

and synthetic rubbers, as well as thermoplastic polyolefins. 


Appearance :                                Off-white powder 

Assay :                                     39.0-41.0% 


Density, 20¡ãC :                             1.65 g/cm³

Bulk density, 20¡ãC :                         470 kg/m³


Silibase-1440B is used for the crosslinking of natural and synthetic rubbers, 

as well as thermoplastic polyolefins. 

• Rubber compounds containing Silibase-1440B have excellent scorch safety, under certain

 conditions one step mixing is possible. 

• Safe processing temperature: 135°C (rheometer ts2 > 20 minutes). 

• Typical crosslinking temperature: 175¡ãC (rheometer t90 about 12 minutes). 

Thermal stability

Organic peroxides are thermally unstable substances, which may undergo self-accelerating

 decomposition. The lowest temperature at which self-accelerating decomposition of a substance in

 the original packaging may occur is the Self-Accelerating Decomposition Temperature (SADT).

 The SADT is determined on the basis of the Heat Accumulation Storage Test.

For Silibase-1440B SADT : 80°C 

The Heat Accumulation Storage Test is a recognized test method for the determination of the

 SADT of organic peroxides (see Recommendations on the Transport of Dangerous Goods, Manual

 of Tests and Criteria - United Nations, New York and Geneva). 

Major decomposition products

Methane, Acetone, tert-Butanol, Di(2-hydroxyisopropyl)benzene, Diacetylbenzene, Acetyl 

2-hydroxyisopropyl benzene

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