firelighter; fire starter
A solid or gel substance used to help ignite charcoal, wood, or campfires. Common in outdoor and barbecue contexts.
When having a barbecue, using a firelighter makes it easier to light the charcoal.
着火 is the act of igniting or catching fire; 着火剤 is the agent or material used to achieve ignition.
火付け役 refers to a person who starts a fire (often figuratively, a catalyst), while 着火剤 is a physical fire-starting product.
Standard kanji spelling using 剤 (agent/chemical).
Alternate spelling using 材 (material); less common but seen on product labels.
Compound of 着火 (ignition) + 剤 (agent/chemical). The alternate form 着火材 uses 材 (material).