Lab testing

Our applications lab has extensive testing capabilities for analyzing new and used filter elements. Our experienced technicians produce a lab report on the basis of the investigation results and provide a qualitative assessment of the results.

Test variants

Basic testing (for condition description)

  • Visual inspection (VI) of the hose for indications of:
    • Damage
    • Oversize, shrinkage
    • Chemical behavior
    • Abrasion,
    • Support cage effects
    • Installation errors
    • Temperature effects
  • Perform air-permeability test
  • Determine area weight
  • Take a cross section photo
  • Create a test report with condition description, documentation of the entire investigation, including measured values and results, and visual assessment with photos.
  • Disposal of hazardous waste for used, contaminated filter elements. Used filter elements will not be returned.
  • Tests on filter media contaminated with aggressive, toxic, or otherwise hazardous substances require increased safety efforts for handling and disposal.

Basic testing (for damage descriptions and service life prognoses)

  • Visual inspection (VI) of the hose, as for basic testing
  • Air permeability test per DIN on pieces of the filter medium, according to the installation situation (for example, top, middle, and bottom for hoses) in the delivered and pulsed condition.
  • Determine area weight of pieces of the filter medium
  • Perform a measurement of load and extension behavior on a sample (minimum length 60-70 cm) per DIN. This provides a basis for recommendations for the remaining service life.
  • Take a cross section photo of a representative material sample at a magnification of 16x to 20x to determine penetration level of dedusting material.
  • Create a test report with condition description, damage description and estimate of remaining service life, documentation of the entire investigation, including measured values and results, and visual assessment with photos.
  • Disposal of hazardous waste for used, contaminated filter elements. Used filter elements will not be returned.

Extended and individualized testing

In addition to basic testing, or as individualized test with brief documentation of results, the following types of testing can be performed:

L/E behavior
Perform a measurement of load and extension behavior on the sample (minimum length 60-70 cm). In order to be able to perform this test, the sample must be washed. By comparing the L/E behavior of the sample with the new values for the material, conclusions can be drawn about damage that the material may have experienced during use. Damaging influences can include high temperature and excessive concentrations of hazardous materials, for example.

Tear propagation resistance
The force required to propagate an existing tear in the sample in the same direction is measured. Sample size of 50 x 30 cm is required.

Seam strength
The load-extension behavior of a stitch thread is determined.

Area weight
The area weight (g/cm2) of several samples of the received filter medium is determined in the contaminated and pulsed conditions. In comparison with the area weight of an unexposed sample, the amount of embedded materials in the filter medium can be determined.

Photographic documentation
In addition to the obligatory cross section photo, magnified photos of the filter media surface and the dust are produced.

REM images
Photos are taken of REM magnifications of the individual fibers, the surface, or parts of the cross section of the filter medium.

Grain band analysis
The grain size distribution is determined from a representative sample (at least 1 liter).

Determine melting point
The melting point of a filter carrier or filter mat is determined.

Polymer assessment
The type of polymer of a filter carrier or filter mat is determined.

Viscosity
The amount of damage to the base materials due to chemical and thermal polymer breakdown or cross-linking is determined.

Thickness
The thickness of the filter medium is determined.

Treatment
The type of chemical treatment of a filter medium is determined.

Determine pH value
Of the dust or the discharge mat of the filter element to be tested.

EDAX analysis
Perform a semi-qualitative analysis of a substance (element composition).

Chemical analysis
Determine qualitative and quantitative content of elements in a substance or fluid sample.

Measurements
Measure the length, width, and thickness, as well as other production-related parameters for a new and unused filter element for subsequent production. Create a production drawing for sole use in the Heimbach manufacturing facility If an order for the corresponding filter body follows the measurements, then the price is invoiced with the order.

VDI 3926 – Standard testing for comparative evaluation of cleanable filter media
Test a filter medium (needle felt or similar web material) according to VDI 3926 (DIN/ISO 11057).A round filter blank is tested with test dust (Pural NF, Pural SB) or a metered dust from an application with respect to differential pressure, backflushing, and precipitation behavior.

On-site sampling
In order to record in the condition or damage description the influence of installed and attached parts of the filter hose, the process, and the particular installation situation of each individual filter hose to be tested, it is sensible and often indispensable for the testing site to take samples directly from each filter hose. The price is based on the effort required and is calculated using TASK® hourly rates.