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Interlock Flooring System

DLG-APPROVED: "Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance, Acid resistance, Cleaning distance"

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The Approval

A test mark “DLG-APPROVED for individual criteria“ is awarded for agricultural products which have success­fully fulfilled a scope-reduced usability testing conducted by DLG according to independent and recognised evaluation criteria. The test is intended to highlight particular innovations and key criteria of the test object. The test may contain criteria from the DLG test scope for overall tests, or focus on other value-determining characteristics and properties of the test subject. The minimum requirements, test conditions and procedures as well as the evaluation bases of the test results will be specified in consul­tation with an expert group of DLG. They corres­pond to the recognised rules of technology, as well as scien­tific and agricultural knowledge and requirements. The successful testing is concluded with the publication of a test report, as well as the awarding of the test mark which is valid for five years from the date of awarding. 

The DLG-Appoved Test “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 Frameworks for elastic stable flooring, as of December 2018 and DIN 3763:2022-08 (Elastic floorings for cattle and dairy cows walking and rest surfaces – Requirements and testing). Other criteria were not investigated.

Assessment – Brief Summary

The Animat walking way cover ­Interlock tested here, an elastic floor for walking ways in cubicle houses, was investigated with ­regard to durability and comfort properties on test stands in the  DLG Approved Test. The deformability and elasticity,  the abrasion resistance, the slip  resistance, the cleaning distance, the acid resistance were measured and a permanent tread load was applied. The deformability and  elasticity in new condition and following permanent tread load were better than standard.  

Requirements DIN 3763 are fulfilled for the tested criteria. 

Deformation and Elasticity corres­ponds to class 1 DIN 3763 for single pens for calves.

Table 1: Overview of results

DLG Quality profileEvaluation
Lying measurement deformability and elasticity in new condition
Lying measurement deformability and elasticity following endurance test
Walking measurement deformability and elasticity in new condition
Walking measurement deformability and elasticity following endurance test
Lasting deformation following 250.000 endurance test
Surface no appreciable wear following 250.000 endurance test
Groves on the bottom little wear
Slip resistance
Resistance to feed acid mixture
Resistance to uric acid
Resistance to sulfurous acid
Resistance to ammonia
Resistance to barn disinfectants
Resistance to peracetic acid
Abrasion/Wear resistance
Cleaning distance with flat jet nozzle  
Cleaning distance with a coarse dirt remover

DLG Evaluation range:
*  ■ ■  or better = meets, exceeds or significantly exceeds the established DLG standards, 
■ ■ = meets the legal requirements for marketability,  = failed
**   Single criteria slip resistance:    =  passed,  =  failed
***    Single criteria acid resistance:   ■ ■ = resistant, 
■ ■  = limited resistant,  = failed

The Product

Description and Technical Data

The Animat walking way cover Interlock tested here, is an elastic floor for walking ways in cubicle houses. 

Black, profiled rubber mat

  • thickness: approx. 20 mm
  • surface with a hammer stroke structure 
  • underside with grooves
    • height approx. 1 mmm
    • width approx. 4 mm
  • space between the grooves: approx. 4 mm
  • Shore A hardness: 70
  • laid as single mat

The Method

Deformability and elasticity

Lying measurement

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).

Walking measurement

The deformability is determined in new condition and after the continuous tread load with a cow’s foot modeled steel base and a penetration force of 2,000 N (approx. 200 kg). Where: the “artificial cow’s foot” in its dimensions is the one used in the con­tinuous tread load. 

Permanent tread load

The measurement of the continuous tread load is carried out with 250,000 alternating loads at 5,000 N (corresponds to approx. 500 kg) on a test bench with a round steel foot. 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 3763:2022-08 was carried out. Test samples (size 30 mm x 30 mm) were completely dipped into 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 were measured. Additional 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

Lying measurement

In the ball penetration tests in new condition with a calotte (r = 120 mm), penetration depth was 3.1 mm. The resulting calculated bearing pressure of 85.6 N/cm² indicates a 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 250,000 alternating loads at 5,000 N. 

Following the endurance test, the penetration depth of the calotte decreased from 3.1 mm to 3.0 mm. The bearing pressure increased from 85.6 N/cm² to 88.4 N/cm² (see Fig. 2a). This means that deformability and elasticity slightly decrease.

Walking measurement

In the penetration test in new condition with a round steel foot (artificial cow´s foot) having a ­diameter of 105 mm (contact area 75 cm², with a 5 mm wide ring at the periphery of the sole, which projects 1 mm over the rest of the surface (carrying edge of the claw)) and a penetration force 
of 2.000 N (corresponding to approx. 200 kg), penetration depth was 1.7 mm. This results in a calculated surface pressure of 26.67 N/cm².

Elasticity was measured after the mat had been exposed to a permanent tread load exerted by the steel foot (250.000 alternating loads of 5.000 N). After the endurance test, the penetration depth of the mat increased to 1.8 mm (see Fig. 2b).

Permanent tread load

After the mat had been exposed to a permanent tread load exerted with 250.000 alternating loads of 5.000 N (corresponding to approx. 500 kg), the mat showed no appreciable wear on the surface and little wear on the grooves. Lasting deformation could not be observed.

Abrasion test

The abrasion depth after 10,000 cycles amounted to 2.0 mm, this corresponds to approximately 10 % of the mat thickness. Of the ground surface 10.4 grams were rubbed off. 

Slip Resistance

The slide pulling tests showed a good slip resistance on the dry or wet rubber mat surface in new condition. The measured friction coefficients (μ) surpassed the minimal value of μ = 0,40 (DIN 3763) and μ = 0.45 (DLG test program).

Acid resistance

Because of the resistance against the used feed- and excrement acids and the used disinfection liquid the rubber mat seems to be well suited for the described use. The rubber mat was resistant against the used test liquids. The rubber mat shows no appreciable changing. 

Cleaning distance

In test stand trials with a high pressure cleaner damage to the mat only occurred when a minimum distance of 50 cm (with a coarse dirt remover) and 5 cm (with a flat-jet nozzle) was not kept. For cleaning and disinfection of the floor cover, only the cleaning agents permitted by the manufacturer should be used.

Table 4: Test liquids and results – acid resistance

Test liquidConcentrationResult
after 24 hours
residence time
after 28 days
residence time
Feed acid mixture    
 concentrate, pH 2no changingno changingresistant
Excrement acids    
Uric acidsaturated urea solution (0.4%)no changingno changingresistant
Sulfurous acid5-6 % SO2no changinglittle colour changing 
(light colored spots on 
the surface)
Ammonia solution32 % solutionno changingno changingresistant
Disinfection liquid    
Barn Disinfection liquid2 %-solution of a product with
formic acid and glyoxyl acid
no changingno changingresistant
Peracetic acid3000 ppmno changingno changingresistant



Based on test-stand investigations, the criteria tested in this DLG Approved Test evaluate the comfort and durability properties of the Animat walking way cover Interlock for use in the walking ways in cubicle houses. The tested Animat walking way cover Interlock met the requirements of the ­Testing Framework with respect to the investigated criteria. The tested Interlock Flooring System met the requirements of DIN 3763 and the DLG Testing Framework with respect to the investigated criteria.

Applicant and Test implementation

Manufacturer and Applicant

Manufacturer and Applicant
Animat Inc.
395 Rodolphe Racine
Sherbrooke Canada

Phone 0060 819 821 2091 222
Telefax 0060 819 821 2879


Test implementation

Testing agency
DLG TestService GmbH, 
Gross-Umstadt location, Germany
The tests are conducted on behalf of DLG e.V.

DLG test framework

DLG Testing Framework for elastic stable flooring, as of December 2018
DIN 3763:2022-08 (Elastic floorings for cattle and dairy cows walking and rest surfaces – Requirements and testing)


Head of Department
Dr. Michael Eise

Test engineer(s)
Dr. Harald Reubold*

*  Author


DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 64823 Groß-Umstadt Germany • Tel.: +49(0)69 24 788-611 •