Viscosity measurement knowledge topic - 4 cups

Abstract: 本文讲述了涂4杯的运动粘度测量方法。根据国家标准“GB 265 运动粘度测定法”，使用毛细管粘度计测量标准油的运动粘度，并通过公式计算涂4杯的标准流出时间 \( T \)。公式为：当 \( 23 \text{s} \leq T < 150 \text{s} \) 时，\( T = 0.223 V + 6 \)；当 \( T < 23 \text{s} \) 时，\( T = 0.154 V + 11 \)，其中 \( T \) 为流出时间（秒），\( V \) 为运动粘度（mm²/s）。标准流出时间 \( T \) 与实际测定的流出时间 \( t \) 的比值即为修正系数 \( K \)，计算公式为 \( K = T / t \)。通过计算一系列修正系数的算术平均值来确定涂4杯的修正系数 \( K \)。若 \( K \) 在 0.95 到 1.05 之间，则该涂4杯合格且可继续使用，但测试数据需乘以修正系数 \( K \) 才能得到真实的实测粘度。

Kinematic viscosity method

This method is based on the national standard "GB 265 kinematic viscosity measurement method", using Capillary Viscometer to measure the kinematic viscosity of various standard oils, and obtain the standard outflow time T of 4 cups of coating through the formula.

T = 0.223 V + 6 (23 s ≤ T < 150 s) (1)

T = 0.154 V + 11 (T < 23 s) (2)

In the formula:

T - outflow time, s;

V - - kinematic viscosity, mm2/s.

The ratio of the standard outflow time T to the measured outflow time t is the correction factor K of the Viscosity Cup. K = T/t (3)

From formula (3), a series of K1, K2, K3?? can be obtained, and the arithmetic average is taken, which is the correction coefficient K of the Viscosity Cup. If K is in the range of 0.95~ 1.05, the Viscosity Cup can still be used, but the test data should be multiplied by the correction coefficient K to be the real measured viscosity.

Products required

NIRUN CAP-2 + PRO cone-plate viscometer Measurement range: 20cP-1500000cP

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