The DLG QUALITY SEAL for operating equipment and consumables encompasses products, which are subjected to extensive testing of their value-determining and advertised characteristics. The tested criteria and the requirements to be fulfilled are specified by independent commissions and are designed – over and above legal requirements – to prove the product’s fitness for purpose, its advertised characteristics and practical requirements. Testing contents and requirements are developed further by the responsible specialist departments of the DLG e.V. in line with the applicable legislation, as well as with technical and scientific progress. Successful testing is concluded with the assignment of the DLG QUALITY SEAL. The approved products are then published.
The DLG quality seal test included technical measurements in the laboratory. The test basis was the DLG test frame for reernate-free and reernate-containing silo films made of low-density polyethylene (PE-LD) with and without barrier shifts, as of November 2016. No other criteria were examined.
|DLG QUALITY PROFILE||Requirement||Evaluation*|
|Film dimensions||≥ nominal length, ≥ 98 % nominal width||✔|
|Film thickness||0.140 ≤ d ≤ 0.170 mm||✔|
|Material condition||evenly coloured, free of streaks and pores||✔|
|Tearing force in new condition||longitudinally, transversely, over folds: ≥ 25 N/cm||✔|
|Elongation of tears in new condition||longitudinally, transversely, over folds: ≥ 400 %||✔|
|Tear resistance in new state||longitudinally, transversely, over folds: ≥ 17 MPa||✔|
|Dart drop resistance in new condition||compliance with the manufacturer's declaration||✔|
|Elongation of tear transversely after acid storage||reduction: ≤ 15 %||✔|
|Tear resistance transverse after acid storage||reduction: < 10 %||✔|
|Elongation of tears transversely after aging (weathering)||> 350 %; reduction in new condition: < 30 %||✔|
|Change in size after warm storage after aging||longitudinal: ≤ 2 % / transverse: < 2 %||✔|
|Oxygen permeability in 0,2 bar||< 250 cm³/(m² · d)||✔|