Accelerant

Vulcanization and Rubber Compounds:
– Accelerators lower activation energy in vulcanization reactions
– Accelerated sulfur vulcanization requires fewer sulfur atoms per cross-link
– Different rubber compounds in car tires require specific accelerators
– Vulcanization accelerators are used with sulfur, zinc oxide, and stearic acid
– Various types of rubber have different vulcanization characteristics

Accelerator Classification:
Primary Accelerators:
– Sulfenamides and thiazoles are main primary accelerator groups
– Thiazoles are used for vulcanization of thick parts and EPDM rubbers
– Ethylene thiourea (ETU) is significant in neoprene rubber vulcanization
– Conventional accelerators are problematic for curing CR rubbers
– European rubber industry researches safer alternatives to ETU

Secondary Accelerators:
– Thiurams and dithiocarbamates are main secondary accelerators
– Used to boost speed and state of cure in tire vulcanization
– Thiurams and dithiocarbamates have fast vulcanization speed
– EPDM rubber requires a rapid vulcanization system
– Latex compounds need a rapid accelerator due to low curing temperatures

Cement and Concrete Accelerators:
– Accelerators are admixtures used in concrete, mortar, rendering, and screeds
– Accelerators speed setting time and early curing
– Concrete must reach a strength of 500 psi before freezing
– Typical accelerators include calcium nitrate, calcium formate, and sodium nitrate

Accelerants in Fire:
– Accelerants in fire protection promote fire development
– Accelerants like oxygen-bearing liquids and gases increase heat production
– Liquid accelerants like gasoline burn faster in fires

Fire Investigation and Types of Accelerants:
– Indicators of arson lead investigators to look for fuel traces in fire debris
– Burning compounds and liquids leave evidence of their presence
– Presence of fuels in unusual areas can indicate incendiary fires
– Hydrocarbon-based fuels are common accelerants
– Ignitable liquids, such as gasoline and kerosene, leave irregular patternshttps://en.wikipedia.org/wiki/Accelerant