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Accelerators

Sulfenamides

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Other	Description
CBS	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥96	1-2		A delayed action primary accelerator for most polymers with good scorch safety and a fast cure rate. CBS is suited for highly loaded compounds with high mixing temperatures.
TBBS	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥105	1-2	Max insolubility in methanol = 0.50%	A delayed action accelerator used in tire and industrial rubber applications. TBBS provides better scorch safety, a faster cure rate, and higher modulus than CBS.
DCBS	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥98		Free Amine % <0.50	DCBS has the longest scorch safety of all the sulfonamides and is used in rubber articles subjected to high dynamic stress. DCBS has a slow cure rate and low modulus, but can improve rubber‐steel adhesion in steelcord skim compounds.
MBS	Granule		≥78		Methanol insoluble = 0.5%; Free Amine = 0.5%	A primary accelerator for thick tread stock with high levels of CB. MBS has good green storage stability, a rapid rate of cure, and can enhance adhesion in steelcord skim compounds.
NOBS	Powder Oiled Powder Granule Masterbatch		≥80			A delayed action primary accelerator and scorch modifying secondary accelerator used in tires, shoes, and belts. NOBS is non‐staining, non‐discoloring, and active over a wide temperature range.

Guanidines

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Description
DPG	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥144	1-2	A secondary accelerator for thiazoles and sulfonamides. DPG is suited for curing thick vulcanizates that require good tear strength. DPG is less active than DOTG with less scorch safety. Non‐staining, non‐discoloring, and nitrosamine free.
DOTG	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥165	1-2	A secondary accelerator for thiazoles and sulfonamides. DOTG has better scorch safety and higher activity than DPG. The preferred secondary accelerator in white sidewall compounds. Non‐staining, non‐discoloring, and nitrosamine free.

Thiurams

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Description
TMTD	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥142	1-2	A primary and secondary accelerator and sulfur donor for most polymers. TMTD activates sulfonamides, thiazoles, and guanidines, and is a cure modifier for Neoprenes. TMTD is considered non‐discoloring and scorchy with a fast rate of cure.
TMTM	Powder Oiled Powder Masterbatch	≤0.2%	≥104	1-2	A secondary accelerator for thiazoles and a booster for sulfonamides. TMTM has good processing safety and provides goodcompression set and high modules. TMTM can also be used in W type Neoprenes and in EPDM roofing membranes to enhance tear strength.
TETD	Powder Oiled Powder Masterbatch		≥66		A primary of secondary accelerator and sulfur donor for most polymers. TETD is less scorchy than TMTD and disperses well in soft compounds because of its low melt point. Non‐discoloring, and can also be used as a cure modifier in Neoprenes.
DPTT	Powder Oiled Powder Masterbatch	≤0.1%	≥104		An ultra accelerator and sulfur donor for most elastomers. DPTT will enhance the high heat stability and aging properties of vulcanizates and has good scorch safety.
TBzTD	Powder Oiled Powder Masterbatch	≤0.1%	≥124		An ultra accelerator and sulfur donor for most polymers with more scorch safety than TMTD. TBzTD produces a low volatility secondary amine which minimizes nitrosamine levels.
TiBTD	Powder Oiled Powder Masterbatch	≤0.5%	≥65		A secondary accelerator for most polymers. TiBTD produces a low volatility secondary amine which minimizes nitrosamine levels.

Dithiocarbamates

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Other	Description
ZDBC	Powder Oiled Powder Masterbatch	≤0.1%	≥104	1-2	Zinc Content = 13-15%; Max residue on 63u screen = 0.5%	Ultra accelerator for NR, SR, and their latices. ZDBC is the most active dithiocarbamate for latex with a fast cure above 100°C, and can be scorchy. In solution, ZDBC can also function as a stabilizer in TPR and hot melt adhesives.
ZBEC	Powder Oiled Powder Masterbatch	≤0.1%	≥180	1-2	Zinc content = 10-12%; Min assay = 95%, max res on 63u screen = 0.50	A primary accelerator in NR, SBR, and their latices. ZBEC offers good scorch safety, and produces a low volatility secondary amine which minimizes nitrosamine levels. Can also function as a stabilizer in TPR and hot melt adhesives.
ZDEC	Powder Oiled Powder Masterbatch	≤0.5%	≥174	1-2	Zinc content = 17-19%, Specific Gravity = 1.41	Ultra accelerator for NR, SR, and their latices. ZDEC has moderate scorch safety with a fast cure at low temperatures. In solution, ZDEC can also function as a stabilizer in TPR and hot melt adhesives.
ZDMC	Powder Oiled Powder Masterbatch	≤0.5%	≥240	1-2	Zinc Content = 20-22%	Ultra accelerator for NR, SR and their latices with a suitable cure over a wide temperature range. ZDMC is more active than thiurams and is oŌen used with thiazoles which reduce scorch. In soluƟtion, ZDMC also function as a stabilizer in TPR and hot melt adhesives.
CDMC	Powder Oiled Powder Masterbatch	≤0.5%	≥300	1-2	Copper Content = 19-22%	A very active dithiocarbamate for high speed SBR and EPDM vulcanization. When CDMC is used with a sulfonamide the cure rate quickens and scorch safety improves. Vulcanizates with CDMC tend to have higher modulus and tensile strength.

Thioureas

Product	Appearance/Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Other	Description
ETU	Powder Oiled Powder Masterbatch	≤0.1%	≥195	1-3		Ultra accelerator used primarily in Neoprene. ETU can also function as a secondary accelerator in EPDM.
DETU	Powder Oiled Powder Masterbatch		≥74	1-2	Specific Gravity = 1.1-1.4; Max res on 250u screen = 0.3%	An accelerator for Neoprene, EPDM, and chlorobutyl. DETU is the most active thiourea for Neoprene, and is used as a secondary accelerator for EPDM and chlorobutyl. DETU is also used as part of corrosion inhibitor systems for metal.
DPTU	Powder Oiled Powder Masterbatch	≤0.5%	≥148	1-2		An accelerator for Neoprene, NR lattices, and NR adhesive systems. In neoprene, DPTU has better scorch safety and a slower rate of cure than other thioureas

Thiazoles

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Other	Descriptions
MBT	Powder Oiled Powder Granule Masterbatch	≤0.1%	≥171	1-2		A general purpose primary accelerator for most polymers. MBT has high activity at low curing temperatures, provides good aging properties, and can be boosted with thiurams, guanidines, and dithiocarbamates
MBTS	Powder Oiled Powder Granule Masterbatch	≤0.05%	≥166	1-2	Final Melt Point = 177.5+/- 7.5deg C; Min Assay = 95%; Maxd free MBT = 2%; Max residue on 63u screen = 0.5%	A general purpose primary accelerator for most polymers. MBTS has better scorch safety than MBT, and is used as a secondary accelerator to modify scorch. Non‐staining, non-discoloring, and is also a cure modifier in Neoprene.
ZMBT	Powder Oiled Powder Masterbatch	≤0.1%	≤200	1-2	Specific Gravity = 1.65-1.72; Free MBT = 12-15%; Zinc Content = 15-18%	A secondary accelerator for latex. ZMBT provides a high modulus in latex film and good compression set in latex foam. In dry rubber, ZMBT is similar to MBT with better scorch safety.

MISC

Product	Form	Residue on 150u Screen	Melt Point Initial (Deg C)	Oil Content (%)	Other	Description
DTDM	Powder Oiled Powder Crystal Oiled Crystal Masterbatch	≤0.1%	≥120	1-2	≤0.5	Sulfur donor for NR and SR containing 27% sulfur which is released during vulcanization. DTDM is non‐blooming, non‐staining, and can replace sulfur in EV and semi‐EV compounds. Usually boosted with thiazoles, sulfonamides, and thiurams. DTDM offers scorch safety and good heat aging resistance.