Composite Panel



Quality means
client satisfaction to us

  Impact and Flexibility tests (DIN EN ISO 6272) 

An impact tester for coatings on metal substrates is used. In accordance with DIN EN ISO standard, the test panel is fixed on the die using a clamping device, so that the panel surface outside the test area is not affected by the rapid deformation caused by the falling weight.  

· Anodized guide tube with a scale in inches and mm
· Tolerance for DIN EN ISO falling weights ± 1 g
· Maximum falling weight 2 kg
· Exchangeable falling weights and dies
· Can be easily converted for testing in accordance with ASTM

Impact Guage

The test apparatus consists of a tube fixed to a solid base plate.  The tube has a slot in which the weight goes up and down with the help of a cylindrical elevator shaft that is bolted to the weight. The tube has an easy reading scale for the drop. The base plate has a fixing plate for the test sample. The weights are fitted and drop on to the impact surface with steel balls and depending on the weight used will create defined geometric shapes. The relationship between the diameter of the ball and the diameter of the test sample must be synchronized in order to avoid a crack in the test sample at the edge of the matrix. In order to limit the depth of penetration of the drop weight, spacers of different thicknesses may be used. The drop weight may be varied by adding additional weights.

Adhesion and scratch resistance test:

It is used for the evaluation of scratch resistance and surface adhesion.

To differentiate the degree of paint adhesion to substrates.

Provides different ratios for sets of painted swatches.

The instrument is a movable hand tool that at one end has a weight and in the centre has a scratching device that can be fixed at a 45 degree angle and at the other end a counterweight.  By turning a fixing screw the tool can lowered or raised. 

The painted metal swatch is fixed by way of a support plate mounted over ball bearings and against the scratch tool.


ASTM D 2197, D 2248, D 2454 and D 5178.


Integrated Management System Policy: quality and the Environment

Every division has its own quality control process as the products are different and the aspects that need to be checked are also different .

We have a complete and accredited laboratory where all the necessary tests are carried out in order to make sure we get a composite panel of the highest quality.

All our panels go through the following quality tests:

Peeling (adherence to aluminium)

This test measures the torque required to peel a sandwich of two layers of aluminium and polyethylene.

Dimension Control

All our panels are within the following tolerances:

Panel length tolerance: +/- 3 mm 

Panel width tolerance +/- 2 mm 

Diagonal tolerance +/- 3 mm

Tests on the painted side of the panel

Paint testing is essential in order to guarantee a quality product, so the Quality Assurance Department at STAC Bond carries out the following tests on the painted side of the panel: 

Gloss tests 
Film hardness by pencil test (ASTM D 3363) 
Wolf-Wilburn pencil hardness test

The purpose of the scratch hardness tests is to determine the endurance of the resistance of coating materials or paints to scratch effects on the surface. This test is of particular value for furniture or vehicle coatering, but is also a useful aid in the development of synthetic resins or other film forming materials.

Generally, scratch hardness is measured by moving a sharp object under a known pressure over the test surface. The result may either be the value of the pressure required to scratch through the test material if a scratching tool of constant hardness is used, or the hardness of the scratching tool is varied while constant pressure is applied.

· Twenty pencils from grade 9B to 9H are used with a standard holder.
· Pencils are moved over the surface under a fixed pressure and a fixed angle - ensuring the least amount of operator error.
· Pencils can be easily exchanged to minimize down time during the test.

Polígono Industrial Picusa - La Matanza 15900 - Padrón. A Coruña (Spain) T: (+34) 981 817 036 F: (+34) 981 817 037