Arti dan Tujuan
5.1 Gloss is related to the ability of a surface to reflect more light in the direction close to the mirror. The measurement made by this test method is correlated with the visual observation of the surface gloss made at a roughly corresponding Angle.

5.1.1 By comparing the specular reflectance of the sample with that of the black glass standard, the gloss grade measured by the test method is compared. Since the specular reflectance also depends on the surface refractive index of the specimen, the measured gloss class will vary with the surface refractive index. Namun, when obtaining visual gloss grades, it is customary to compare the specular reflectance of two specimens with similar surface refractive indices.

5.2 Other visual aspects of surface appearance, such as the sharpness of reflected images, reflected haze, dan tekstur, are often involved in the evaluation of gloss (1), (6), (7). The test method E430 includes techniques for measuring image gloss and reflected haze. Test method D4039 provides an alternative procedure for measuring reflected haze.

Metode Uji Standar ASTM D523-2018 untuk Mirror Gloss

5.3 There is little information on the relationship between the numerical value of specular gloss and the perceived interval. Namun, in many applications, the glossiness scale of this test method provides an instrumental scaling for coated specimens that is in good agreement with visual scaling (10).

5.4 Nonlinearities may be encountered in the relationship between visual gloss difference grades and instrumental gloss reading differences when comparing specimens that differ substantially in perceived gloss or color or both.

Metode Uji Standar ASTM D523-2018 untuk Mirror Gloss

Ruang lingkup
1.1 The test method covers the specular gloss measurement of non-metallic specimens with 60°, 20 and 85° (1-7) glossometer geometries. Angka Arab

1.2 Nilai yang dinyatakan dalam inci-pound harus dianggap sebagai nilai standar. Nilai yang diberikan dalam tanda kurung adalah transformasi matematis dari satuan SI dan hanya untuk referensi dan tidak dianggap standar.

1.3 Standar ini tidak dimaksudkan untuk mengatasi semua masalah keselamatan, jika ada, terkait dengan penggunaannya. Pengguna standar ini bertanggung jawab untuk menetapkan keselamatan yang sesuai, praktik kesehatan dan lingkungan dan untuk menentukan penerapan pembatasan peraturan sebelum digunakan.

1.4 Standar internasional ini telah dikembangkan sesuai dengan prinsip-prinsip standardisasi yang diakui secara internasional yang ditetapkan dalam Keputusan Prinsip-Prinsip Pengembangan Standar Internasional, Pedoman dan Rekomendasi yang dikeluarkan oleh Komite Hambatan Teknis Perdagangan Organisasi Perdagangan Dunia.