Emerald Kalama Chemical

Cure-Rite® OBTS Rubber Accelerator

Cure-Rite® OBTS is an effective and proven sulfenamide (sulfur donating) accelerator. Manufacturers benefit from longer, delayed-action rubber vulcanization. Rubber applications include natural rubber (NR), blends of NR and butadiene rubber (NR-BR), and blends of NR and styrene-butadiene rubber (NR-SBR), particularly in combination with fine-grade carbon blacks.

Cure-Rite OBTS is typically used in the range of 0.5-4.0 phr. Compared to CBS, Cure-Rite OBTS offers better scorch protection, cure rate, and state of cure. The long scorch delay allows Cure-Rite OBTS to produce high-value rubber with high modulus and excellent dynamic elasticity. Cure-Rite OBTS is well-known for the production of thick cross-section tread vulcanizates and complex precision molded, injected, or extruded goods.

Cure-Rite OBTS can be used in combination with Cure-Rite 18 to vary crosslink length and vulcanizate properties.

Attribute	Value
Typical Properties
Physical State	Flake
Melting Point (°C)	80-87
Heat Loss (%)	1.0
Ash (%)	0.15 max.
Moisture (%)	0.2 max.
Free Amine (%)	0.3 max

Application Group	Application	Description
Automotive	Automotive Rubber	Longer delayed-action accelerator for articles with excellent rubber properties
Rubber	Footwear	Best accelerator choice for the production of rubber soles in athletic footwear
Rubber	Molded Goods	Fast cure accelerator over broad process temperature range for intricately molded and injected rubber
Rubber	Tires	Accelerator with longer-delay action, allowing for complete cure in thick, extruded treads
Rubber	Rubber Goods	Longer scorch delay affords classic rubber properties to extruded, molded or injected goods.