DLG e.V. - Test: Rubber mat RM21BS

Rubber mat RM21BS Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance, Acid resistance, Cleaning distance

Assessment – Brief Summary

The DeLaval rubber mat tested here, an elastic floor covering for the resting area in cubicle houses, was investigated with regard to durability and comfort properties on test stands in the DLG-APPROVED test for single value-determining criteria. The deformability and elasticity of the cubicle mat, the abrasion resistance, the slip resistance, the acid resistance, the cleaning distance were measured and a permanent tread load was applied.

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Table 1: Overview of results

Test characteristic Test result Evaluation*
Deformability and elasticity
– in new condition 6,2 mm
– following endurance test 6,5 mm
Permanent tread load
no lasting deformation ++
no appreciable wear +
Abrasion test
good wear resistance +
Slip resistance**
good slip resistance on dry and wet mat surface +
Acid resistance***
Feed acid mixture resistant +
Uric acid resistant +
Sulfurous acid resistant +
Ammonia solution resistant +
Disinfection liquid resistant +
Peracetic acid resistant +
Cleaning distance
with flat jet nozzle 20 cm
with flat jet nozzle 45 cm

*    Evaluation range: ++ / + /◯ / – / –– (◯ = Standard)
**    Evaluation range: + / –
***    Evaluation range: + = resisitant / ◯ =  limited resisitant  / – = not resisitant

The Product

DeLaval rubber mat RM21BS

Description and Technical Data:

Black, profiled cubicle rubber mat

  • ca. 23 mm thick
  • Surface with a triangle structure
  • Underside with conical knops
  • ca. 6 mm high
  • diameter at the bottom ca. 19 mm
  • Strip wise installation
  • Shore A: ca. 70

The Method

Deformability and elasticity

The deformability is measured in new condition and following permanent tread load using ball penetration tests with a calotte (r = 120 mm) and a penetration force of 2,000 N (corresponding to approx. 200 kg).

Permanent tread load

The permanent tread load is measured on a test stand with a round steel foot in the standard test programme with 100,000 alter­nating loads at 10,000 N (corresponding to approx. 1,000 kg). The steel foot is adapted to the natural conditions as an “artificial cow foot”. The foot has a diameter of 105 mm and therefore a contact area of 75 cm²; the carrying edge of the hoof is simulated by a 5 mm wide ring on the periphery of the sole that projects 1 mm above the rest of the surface.

Abrasion test

In a standardised abrasion test with 10.000 cycles the top cover was grinded with an emery cloth (granulation 280) and a grinding pressure of 500 N (= 8.1 N/cm2 surface pressure). The friction element was cooled continuous with water to prevent an influence of the generated heat during the abrasion test. The size of the grinded  area was 61,5 cm².

Slip resistance

The measurements were carried out with the ComfortControl test rig of the DLG test centre. A loaded (10 kg) round plastic foot (105 mm diameter, with a contact area of 75 cm2, 3 mm wide ring at the periphery of the ground) was pulled with a velocity of 20 mm/s across the mat.

Acid resistance

A permanent dipping test in accor­dance to DIN EN ISO 175:2000 (performance of synthetic material against liquid chemicals) was carried out. Test samples (size 30 mm x 30 mm) were complete dipped in different test liquids for 24 hours and 28 days (room temperature 20° Celsius). In the 28 days test the liquids were changed weekly.  After the 28 days the samples were washed with distillate water and dried for 24 hours. Before and  after the dipping the weight, the dimensions and the shore hardness (shore A) of the test samples was measured. Additional a visual eva­luation was done for alterations like colour changing, swelling, destruction or crystallisation. All samples were evaluated in comparison to the standard water.

Cleaning distance

In test stand trials with a high pressure cleaner (approximately 145 bar, exposure period 1 minute with a 25° flat jet nozzle and a coarse dirt remover) the distance was measured where no damage occurs.

The Test Results in Detail

Deformability and elasticity

In the ball penetration tests in new condition with a calotte (r = 120 mm), penetration depth was 6.2 mm. The resulting calculated bearing pressure of 42.8 N/cm² indicates a relatively small load on the carpal joints when lying down and getting up.  Elasticity was mea­sured following a permanent tread load exerted by a steel foot (contact area: 75 cm²) with 100,000 alternating loads at 10,000 N. Following the endurance test, the penetration depth of the calotte increased from 6,2 mm to 6.5 mm. The bearing pressure decreased from 42.8 N/cm² to 40.8 N/cm² (see Fig. 4). This means that deformability and elasticity slightly ­increase.

Evaluation see Table 1.

Figure 2: Deformability as a function of bearing pressure

Permanent tread load

No noticeable wear was observed on the top cover following exposure to permanent tread load on a test stand with 100,000 alternating loads at 10,000 N. No lasting deformation was observed.

Evaluation see Table 1.

Abrasion test

The abrasion depth after 10,000 cycles amounted to 2.3 mm, this corresponds to approxi­mately 10 % of the rubber thickness. Of the ground surface 8.1 grams were rubbed off.

Evaluation see Table 1.

Slip resistance

The slide pulling tests showed a good slip resistance on the dry or wet mattress surface in new con­dition. The measured friction coefficients (μ) all surpassed the minimal value of μ = 0.45 which speaks for a good foothold.

Evaluation see Table 1.

Figure 5: Permanent tread load

Figure 6: Test sample after abrasion test

Acid resistance

The rubber mat was resistant against the used test liquids. The differences in weight, thickness and Shore A hardness between the acid treated and not acid treated samples were minor and lay in the range of water as standard. Against the used liquids the rubber mat seems to be good suited for the described use.

Evaluation see Table 1.

Cleaning distance

In test stand trials with a high ­pressure cleaner damage to the rubber mat only occurred when a minimum distance of 45 cm (with a coarse dirt remover) and 20 cm (with a flat-jet nozzle) was not kept. For cleaning and disinfection of the rubber mat, only the cleaning agents permitted by the manufacturer should be used.

Evaluation see Table 1.

Figure 7: Samples after acid resistance test

Scroll table to the right to see full display !

Table 2: Test liquids and results acid resistance

Test liquid concentration result after 24 hours residence time result after 28 days residence time Evaluation
Feed acid mixture
concentrate, pH 2 no changing no changing resistant
Excrement acids
Uric acid saturated urea solution (0,4%) no changing no changing resistant
Sulfurous acid 5-6 % SO2 no changing no changing resistant
Ammonia solution 32% solution no changing no changing resistant
Disinfection liquid
Barn Disinfection liquid 2%-solution of a product with formic acid and glyoxyl acid no changing no changing resistant
Peracetic acid 3000 ppm no changing no changing resistant

Summary

Based on test-stand investigations, the criteria tested in this DLG-APPROVED test for single value-determining criteria evaluate the comfort and durability properties of the DeLaval rubber mat RM21BS for use in the resting area of high cubicles in cubicle houses. The tested DeLaval rubber mat RM21BS met the requirements of the Testing Framework with respect to the investigated criteria.

DLG Test Center Technology and Farm Inputs

DLG e.V.
Max-Eyth-Weg 1
64823 Groß-Umstadt
Germany
Tel.: +49(0)69 24 788-611
tech(at)DLG.org

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DLG-APPROVED Single value-determining criteria
A quality mark “DLG-APPROVED for single value-determining criteria” is awarded to agricultural products which successfully passed a smaller-scope DLG usability test according to independent and recognized evaluation criteria. The test intends to highlight special innovations and key criteria of the test item. The test can focus on criteria from the DLG testing framework for full tests or on other individual features or qualitative criteria. The minimum requirements, the test conditions and procedures as well as the evaluation guidelines of the test results are determined in consultation with a DLG expert group. They comply with the generally recognized technology rules as well as with scientific and agricultural knowledge and requirements. The successful test concludes with the publishing of a test report and the awarding of a quality mark which is valid for five years following the award date.

The DLG-APPROVED test for single value-determining criteria “Defor­mability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance, Acid resistance, Cleaning distance” includes technical measurements on test stands of the DLG Test Center. The deformability and elasticity, the abrasion resistance, the slip resistance, the acid resistance, the cleaning distance were measured and a permanent tread load was applied. The test was based on the DLG Testing Framework for elastic stable flooring, as of April 2010.  Other criteria were not investigated.

Manufacturer and Applicant

DeLaval International AB site
Glinde, P.O. Box 1136,DE-21509
Glinde/Germany

Contact:
Telefon: 040 3033 44-339
Fax: 040 3033 44-349
Elaine.Araujo(at)delaval.com
www.delaval.com

Test execution

DLG e.V.,
Test Center
Technology and Farm Inputs,
Max-Eyth-Weg 1,
64823 Groß-Umstadt
Germany

DLG Testing Framework
DLG Approved Test
“Elastic Stable Flooring”
(as at 04/2010)

Field
Indoor operations

Project manager
Dipl.-Ing. Susanne Gäckler

Test engineer(s)
Dr. Harald Reubold  *

* Reporting engineer