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Sludge Dewatering Filter Bag

Soft mattress is one of the most effective components that are most usually used in protective structure of waterproof erosion. Soft mattress is covered to the places where water flows to reduce the impact energy of water flow and protect soil particles from being flown away by water flow by......

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Soft mattress is one of the most effective components that are most usually used in protective structure of waterproof erosion. Soft mattress is covered to the places where water flows to reduce the impact energy of water flow and protect soil particles from being flown away by water flow by means of its filter function, thus, ensuring the stability of soil mass.

Soft mattress can be divided into monolithic mattress, biplate mattress and foot mattress, etc, and there are also various types of soft mattress with and without fillings, which are separately covered to riverbed or bank slope surface where washing may probably occur, thus riverbed or bank slope soil mass is separated from water floe to avoid washing. Place riprap, precasted concrete block or interlocking blocks in soft mattress as pressure weight, to protect soft mattress from being floated up or moves by water flow.

Mechanical Properties

Test Method

Minimum Average (English)

Minimum Average (Metric)

Mass/Unit

ASTM D-5261

8 oz/yd²

270 g/m²

Grab Tensile Strength (MD x CD)

ASTM D-4632

225 x 225 Ibs

1000 x 1000 N

Grab Tensile Elongation

ASTM D-4632

50 x 50 %

50 x 50 %

Trapezoidal Tear

ASTM D-4533

90 x 90 Ibs

400 x 400 N

CBR Puncture

ASTM D-6241

600 Ibs

2670 N

Apparent Opening Size(AOS)

ASTM D-4751

80 US Std.Sieve

0.18 mm

Permittivity

ASTM D-4491

1.26 sec-1

1.26 sec-1

Water Flow Rate

ASTM D-4491

100 gal/min/ft²

4074 L/min/m²

UV Resistance (% retained after 500 hours)

ASTM D-4355

70 %

70 %

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