To provide a liquid-absorbing wick for heat-transpiration which can be used for the transpiration of a chemical liquid containing a pyrethroid-based insecticidal component with a relatively high vapor pressure, and when in use the stable transpiration performance and high insecticidal effect can be achieved to prevent the leakage of the chemical liquid caused by the rise of the internal pressure of the chemical liquid container or the liquid leakage caused by the toppling of the chemical liquid container, and the transpiration performance of the liquid-absorbing wick for heat-transpiration can be maintained for a certain period of time. A liquid-absorbing wick for heat-transpiration, which is used for the transpiration of a chemical liquid containing a pyrethroid-based insecticidal component having a vapor pressure of 2×10<；SP>；-4<；/SP>； to 1×10<；SP>；-2<；/SP>； mmHg at 30 DEG C or below, comprising inorganic powder, inorganic binder, and organic substance as raw materials, wherein the ratio (W1/W2) of the total weight (W1) of inorganic powder and inorganic binder to the weight (W2) of the organic substance is set to 4.0 to 10.提供一種在可使用於含有蒸氣壓比較高的擬除蟲菊酯系殺蟲成分的藥液的蒸散之加熱蒸散用吸液芯中，當然達成使用時穩定的蒸散性能與高的殺蟲效力，可防止因藥液容器的內壓上升造成的藥液洩漏或藥液容器的翻倒造成的藥液洩漏，由製造起經過一定的時間也能維持吸液芯的蒸散性能之加熱蒸散用吸液芯。 一種加熱蒸散用吸液芯，用以使含有30℃下的蒸氣壓為2×10-4~1×10-2mmHg之擬除蟲菊酯系殺蟲成分的藥液蒸散，包含無機質粉體與無機質黏結劑與有機物質當作原料，在原料中，無機質粉體及無機質黏結劑的合計重量(W1)，與有機物質的重量(W2)的比率(W1/W2)設定為4.0~10。
