Wet Film Thickness Gauge Model 433

Description

Film thickness measurement plays an essential part in the use and testing of paints and coating materials. The film thickness is a decisive factor in determining appearance, protective qualities and durability.

A film which is too thin will afford inadequate protection and reduced hiding power. For this reason, technical specifications stipulate minimum film thicknesses and regular controls must be carried out to ensure that these values are consistent.

On the other hand, an excessively thick film is the result of using too much coating material, causing costs to increase accordingly. Furthermore, thicker coatings do not always mean an improvement in properties: for example, they have an adverse affect on drying time.

The physical and mechanical properties of a coating are directly dependent on the film thickness. If meaningful testing is to be conducted, the film thickness must therefore be uniform.

Wet film thickness gauges are used to check freshly applied coatings and can also be used to calculate the resulting dry film thickness. If deviations from the specified value are detected, corrective measures can be taken immediately.

Mechanical film thickness gauges provide a number of advantages:

• Handy, portable, and simple to operate, even by unskilled personnel.
  • Sturdy construction, direct reading.
• Measurements can be carried out on any surface. Since the system functions completely mechanically, substrates of glass, wood, metal or plastic are permissible.
• In comparison to other systems, mechanical film thickness gauges are favourably priced
  
  

Application

This easy-to-use comb-type measuring instrument can be used on any substrate.

Test Principle

Teeth are cut into all sides of a square stainless steel measuring blade at a progressively increasing distance from the substrate. Engraved figures indicate the distance in μm from the substrate.

The measuring range from 5 to 1500 μm is sub-pided as follows:

• 5 - 100 μm ( 5 μm scale pision)
• 100 - 300 μm (10 μm scale pision)
• 300 - 700 μm (20 μm scale pision)
• 700 - 1500 μm (40 μm scale pision)

By covering this extensive measuring range, the instrument is especially good value for the user.

The instrument is supplied in a synthetic leather pocket.

Excellent Measuring Accuracy

• Maximum deviation 3 μm (5 - 55 μm) or 5% from nominal value (60 - 1500 μm),
• Typical deviation less than 3 μm over the entire scale range
  
  

Certifiable for QA Systems

Unlike the model 333 measuring blade, the model 433 film thickness gauge can be supplied – at extra charge – with a manufacturer's test certificate M to DIN 55 350 T 18. This certificate includes details of the values relating to the specific quality features of each inpidual instrument as determined in the ERICHSEN testing laboratory. It is no longer necessary for the user to carry out incoming tests.

Measuring Procedure

Place the measuring body with the measuring range in which the wet film thickness is suspected vertically on the measuring surface. Under moderate pressure, perform a short “combing” movement and lift the wet film thickness gauge vertically. At the first wetted tooth, the wet film thickness is read off the scale.

Scope of delivery

• Wet film thickness gauge, model 433, with 4 graduation ranges:
  • 5 - 100 μm ( 5 μm scale pision)
  • 100 - 300 μm (10 μm scale pision)
  • 300 - 700 μm (20 μm scale pision)
  • 700 - 1500 μm (40 μm scale pision)
• Case