针入度是指标准圆锥体（一般共载重150克，也有规定100克的）在5秒钟内沉入保温在25℃时的润滑脂试样中的深度。单位是1/10毫米。针入度愈大表示润滑脂愈软，即稠度愈小；反之则表示润滑脂愈硬，即稠度愈大。沥青的针入度测定，不用标准圆锥体而用载重共100克的标准尖针。测定的条件与润滑脂相同。
... bit penetration钻头进尺速度;钻头吃入深度 penetration bead熔透焊道;根部焊道 cone penetration针入度;锥体针入度 ...
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结果：黑膏药的软化点、黏度与软硬度呈正相关，而针入度与软硬度呈负相关。
Results: The hardness of black plaster is positively associated with softening point and viscosity, while it is negatively correlated with penetration.
结果表明：TLA均可提高两种基质沥青的软化点，增大其粘度，降低其延度和针入度。
The results obtained are as follows: the softening point and viscosity of two asphalts were increased, while the penetration and ductility were decreased with the introduction of TLA.
同时，老化过程中，沥青针入度、软化点及延度的变化进一步证明了所得动力学模型是可靠的。
The changes of penetration, softening point and ductility of asphalt during aging proved that the kinetic model is reliable.
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