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蠟青,亦叫瀝青,係黏度好高嘅有機液體,黑色,會溶喺二硫化碳裏面。佢形態以柏油或者焦油為主。
柏油形態嘅蠟青,係將原油用分餾法提煉嘅。佢喺原油裏面,沸點最高,同埋原油裏便,最重嘅成份,所以會喺分餾塔最底度搵到。而焦油形態嘅蠟青,就係將有機物質(煤炭為主),經過乾餾法處理而取得。
蠟青多數用喺建築上,好似鋪馬路噉。
蠟青英文有分asphalt同bitumen,但唔同地方有唔同解釋,有時會混用。Bitumen主係講自然形態嘅蠟青,而asphalt係石油提煉嘅副產品。不過實際上好多時各處鄉村各處例,各有各解。有時又會指係蠟青同石屎混合物,鋪路用。
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