| Electrostatic Charge Retention |
American Standards Testing Method (ASTM) D4470 |
<2.0 kV |
| Ink Absorbency |
| • | Use a spatula to apply a thick layer of K&N testing ink over a spot larger than the aperture of the reflectance photometer. |
| • | Leave the ink on the paper for exactly 120 seconds. |
| NOTE: | Apply enough ink so that the spot remains well wetted for the full 120 seconds. |
| • | At 120 seconds, use a spatula to remove the excess ink. |
| • | Wipe off remaining unabsorbed ink with a soft towel. |
| • | Adjust a diffuse reflectance photometer to read 100% using the Commission Internationale de l'Éclairage (C.I.E.) Y tri-stimulus filter, illuminant “C” and a sample of the front surface of the tested sample. |
| • | Read the diffuse reflectance over the ink spot. |
|
Maximum reflectance = 60%
|
| Luminescence |
Compare the sample with “Century Premium Opaque Cover” or “Mayfair Cover Antique Britewhite” card. |
Less than these cards. |
| Opacity |
Canadian Pulp and Paper Association (CPPA) recommended method Standard E2. |
80% or greater |
| Reflectance |
CPPA approved method Standard E.1. |
Minimum area reflectance = 45%
not to exceed 95%
Maximum variation = 5% |
| Smoothness |
Standard Sheffield Method
CPPA proposed method, Standard .29P |
Between 55 & 380 Sheffield Smoothness Units |
| Thickness |
CPAA approved method Standard D.4. |
Not less than 0.18mm |
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