Viscose belt filter media V50, 50 gsm, the denser of the two

One step up from the standard viscose media

This page is written for one particular moment. You are already running a 30 gsm viscose media, and there are more fines in the filtrate or in the tank than you would like. Or the solids load has gone up because the workpiece material, the cutting data or the utilisation of the machine has changed.

A 50 gsm viscose filter roll is the obvious next step for that case. It is the same raw material and the same bonding as the V30, built more densely. You are not changing the material, only the grade, and on a running machine that is the lower-risk change.

The difference to the V30 in numbers

Because both qualities were tested to the same standard at 2 millibar, their figures are the only two in this product family that can be compared directly.

Three of those rows matter in practice. The thickness says there is more fibre material in the cross section. The lower air permeability says the material offers more resistance to flow. And the much higher cross-direction tensile force says the media takes more mechanical load as the belt pulls it forward, which is a real argument under a heavy filter cake.

What follows from that, and what does not

A denser media tends to hold back more. That is plausible, and it is the reason this quality exists alongside the V30.

What does not follow is a particular cut-off. There is no tested filtration rating for the V50, and none can be derived from 50 gsm. Nor is a longer roll life predictable: a denser media takes up more, but also closes faster. Which of the two effects wins in your machine depends on the solids load, the belt control and the differential pressure threshold.

That is why moving from V30 to V50 is always worth measuring. A trial roll over a full maintenance cycle gives the answer no data sheet can.

When the V50 is not the answer

Two cases argue against this quality.

If flow is already tight and the machine indexes frequently, a denser media makes that worse. The cause then lies in the sizing of the filter area or in pre-separation rather than in the fabric weight.

And for grinding processes with very fine sludge the V50 is usually not the right answer either. That is the job of the much thicker polyester media P150, which at 1.31 millimetres is around four times as thick and is built differently.

Technical data, viscose coolant filter roll 50 gsm

The core diameter is not documented for this quality. If your machine requires a particular core, send us the dimension. The three widths are the same across the category: a 500mm coolant filter roll, a 710mm coolant filter roll and a 1000mm coolant filter roll.

Frequently asked questions about the 50 gsm viscose media

Almost every question about this quality is a comparison with the V30.

What is the documented difference to the V30?

Same raw material and same bonding, but 50 instead of 30 gsm, 0.36 instead of 0.25 mm thickness and around 3,600 instead of 5,300 l/m²/s air permeability under the same test condition, plus a noticeably higher tensile strength.

Does the V50 filter more finely than the V30?

It is built more densely and passes less, which suggests higher retention. There is no tested filtration rating for either quality, and none can be derived from the fabric weight. The statement only becomes reliable through a trial in your machine.

Does a V50 roll last longer?

That cannot be answered in general. More material can take up more, but a denser media also closes faster. Which effect wins is decided by your solids load and your belt control.

Is this filter paper?

The trade calls it a viscose paper filter roll, and it runs on the same belt filters as paper media. The material is a viscose nonwoven, not cellulose paper.

When is a trial roll worthwhile?

Whenever you want to move up from the V30, or when the workpiece material, the cutting data or the utilisation has changed. One roll over a full maintenance cycle shows roll life, filtrate quality and indexing behaviour under real conditions.

Is the V50 suitable for grinding machines?

For grinding with very fine sludge the polyester media P150 is usually the better fit. It is around four times as thick at 1.31 mm and bonded differently.

Which dimensions do I need to check?

Roll width, running length, core diameter, the maximum roll outside diameter in the magazine and the unwind direction. The guide takes you through the measurement.