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BIUGED INSTRUMENTS offers a wide range of drawdown cards and charts for virtually any application and coating material. Stringent equality control during the production process assures that they have the most consistent color and gloss in the industry. Test charts are easy to use and an economical substrate to test a variety of coating properties, such as opacity, spreading rate, and flow& leveling behavior. They are used for testing architectural, industrial, automotive, wood finishes or even cosmetic products（e.g. nail polish）.Depending on the material properties of the product to be tested and its usage different types of drawdown cards are available.

Selection of test charts dependent on coating technology

Depending on the types of solvent used in paint formulations a drawdown chart needs to be more or less solvent resistant. The resin type requires different solvent types and dependent on the polarity of the solvent, the organic ingredients will be more or less activated. Therefore, BIUGED offers two types of drawdown cards and charts.

① Clear-coated Charts

◆ Are ideal for a wide range of coating systems: water and solvent borne technologies

◆ Guaranteed non-fluorescent paper in compliance with ASTM D 344

◆ Repeatable color and gloss-lot after lot

◆ Superior adhesion characteristics, especially with latex paints

◆ Rugged design（ 0.5 mm thickness）to prevent warping and bending after the coating is applied.

◆ Package is shrink-wrapped with low permeability plastic to prevent moisture absorption during shipping and storage.

② Film Laminated Charts

◆ With excellent solvent resistance

◆ Repeatable color and gloss-lot after lot

◆ Smooth, structure free surface

◆ Superior adhesion properties and flexibility

◆ With 0.5mm thickness

◆ Double film laminated will not warp and bend-even in high humidity environments.

Essential sales criteria for architectural paint are hiding power and yield. In other words:
---How many layers are necessary for complete coverage?       
---And how many cans will be needed?

Opacity（%）=Y black×100（%）/Y white

100% opacity means complete hiding, no difference can be seen between the drawdown over black and white.

Procedure

A uniform paint film is applied on a black/white contrast chart. After air drying the drawdown can be objectively evaluated using the BIUGED opacity meter. The operator is menu guided through the measurement procedure and the opacity value is displayed automatically in a second.

The same procedure can be applied for transparent films and plastics.

Opacity Charts

▉ Comprised of a simple combination of black and white areas. The reflectance of black area＜1；reflectance of with area：80±2。

▉ With ample for reflectance measurement               

▉ With the lot number printed on every chart