Description
Cellulose is the one hand sponge in this range whose material is confirmed by its manufacturer rather than assumed from its colour. The INSTAR product page for code 10-0324 — matched to this listing by the EAN in the store record — sets out what the sponge is made of and what it was designed to wash, which is more than most sponge listings carry. It sits in the Renders World power float and finishing sponge range as the thinnest of the six hand formats.
Where the Cellulose Cleaning Sponge Fits on Tiling and Render Work
The cellulose cleaning sponge 150 x 100 x 30 mm is the INSTAR-made tiling sponge stocked at £5.50 per sponge, August 2026, and its manufacturer specifies it for washing off cement and epoxy grout and cleaning tiles during tiling work. That epoxy line is the detail worth reading twice, because it is stated by the maker rather than inferred.
Two design points come from the same source and both change how the sponge handles. It is made of cellulose, which INSTAR describes as collecting soiling more effectively than the alternative, and its specially profiled edges hold more water inside the structure to limit dripping as you work. The practical consequence is a sponge that carries its water rather than shedding it down the wall, which is what reduces the risk of washing a fresh joint out.
- Grout wash-off on tiling work, cement and epoxy alike, which is the manufacturer's stated purpose.
- Render clean-down on trims, sills, reveals and adjacent brickwork where splashes need lifting before they harden.
- Painting, wallpapering and other finishing trades — INSTAR names these explicitly as secondary uses for water and dirt collection.
- Detail zones a 390 mm machine disc cannot reach, where a 30 mm body fits into returns and internal angles.
Why Trade Buyers Keep a Cellulose Sponge in the Kit
- Documented material: cellulose, confirmed on the manufacturer's own product page against the EAN in the store record — not a shelf description.
- Epoxy grout in scope: INSTAR specifies cement and epoxy grouts, which is the harder of the two jobs and the reason this sponge is worth its price over a general foam.
- Profiled edges: designed to retain water in the body and limit dripping, useful on ladder work and above finished surfaces.
- Thinnest format stocked: the 30 mm body reaches reveal returns and internal corners that deeper sponges bridge across.
- Reusable: described by the manufacturer as durable and resistant to intensive use, and suited to professional and domestic work alike.
What the Manufacturer and the Store Record Confirm
| Property | Value | Source |
|---|---|---|
| Material | Cellulose | INSTAR product page, code 10-0324 |
| Intended use | Washing cement and epoxy grout, cleaning tiles | INSTAR product page |
| Edge design | Profiled edges retaining water to limit dripping | INSTAR product page |
| Manufacturer code | 10-0324 | INSTAR product page |
| EAN | 5905280130865 | Store record and INSTAR page — the two agree |
| Dimensions | 150 x 100 x 30 mm as sold; see the width note below | Store product name and INSTAR size column |
| Face area | 150 cm² (150 mm x 100 mm) | Arithmetic from the dimensions as sold |
| Vendor field | INSTAR | Store product record, August 2026 |
| Price | £5.50 per sponge, August 2026, no VAT treatment displayed | Store product record |
| Stock | Listed as available, August 2026 | Store product record |
| Water capacity, absorbency, pore grade | Not published — no figure in any source read | — |
One discrepancy is worth carrying to the order rather than smoothing over. INSTAR's size column gives 150 x 100 x 30 mm, matching the name this sponge is sold under, while two distributor listings for the same code state a 110 mm width. Order against the code 10-0324 and EAN 5905280130865, which both sources agree on, and treat the 10 mm as a nominal tolerance rather than a choice between two products.
No absorbency figure appears above, and that is deliberate. INSTAR describes very high absorbency in words but publishes no number, and its own table shows a dash in the product-card column — so there is no data sheet behind a litres-per-sponge claim, whoever quotes one. What the manufacturer does establish is the material and the grout types, which is what the buying decision actually turns on.
How to Use the Cellulose Sponge on Grout and Render Residue
Soak the sponge through before the first wipe, because cellulose stiffens as it dries and does very little until it has taken water back up. A minute in clean water is the difference between a working sponge and a stiff pad.
- Let the grout take its initial set before washing — the grout manufacturer's instructions govern the wait, not the sponge.
- Wring to damp rather than dripping, so the profiled edges do the water-holding job they were shaped for.
- Wipe diagonally across the joints, which crosses each joint at an angle and lifts haze evenly instead of dragging material out of the line.
- Squeeze deliberately when rinsing. Cellulose holds what it collects, so a passive dunk leaves the body loaded from the last pass.
- Run two buckets — one to release the dirt, one clean for the closing pass, since dirty rinse water is the usual cause of haze on otherwise sound work.
On epoxy grout, work to the grout maker's washing window closely and change the water more often than you would on cement; epoxy residue that is allowed to harden stops being a sponge job altogether. On render this is the hand pass around details after the machine work, and residue from the EPS adhesives basecoats range lifts off adjacent trims far more easily before it sets. The Renders World guide to power float technique and tool selection places the hand pass in the full finishing order.
How the Cellulose Format Compares With the Foam Sponges
Six hand sponges are stocked and this is the only cellulose one; the rest are synthetic foam. The comparison therefore runs on material and geometry, and all prices below were read from the store in August 2026.
| Sponge | Face and depth | Price, Aug 2026 |
|---|---|---|
| Cellulose 150 x 100 x 30 mm (this listing) | 150 cm² · 30 mm · cellulose | £5.50 |
| KAEM 15 x 10 x 5 cm compact sponge | 150 cm² · 50 mm · synthetic foam | £1.20 |
| Beige tiling sponge 170 x 110 x 60 mm | 187 cm² · 60 mm · synthetic foam | £2.50 |
The price column is the honest headline: this is the dearest hand sponge in the range and it shares its 150 cm² face with the cheapest one at £1.20. Nothing in any source read supports a performance figure that justifies the gap, so the case for it rests on what INSTAR does state — cellulose construction, epoxy grout in scope, and profiled water-retaining edges. Where the work is cement grout on open areas, the foam formats cover more face for less money and this sponge is the wrong tool to buy in quantity.
Choosing and Ordering the Right Sponge for the Job
- Epoxy grout wash-off: this sponge, on the manufacturer's own stated scope.
- Detail work in reveals, returns and internal angles: the 30 mm body is the thinnest stocked and the deciding dimension.
- Bulk cement grout and open floors: the foam formats give more face per pound; buy those for volume and keep this one for the closing pass.
- Machine finishing: discs for the render smoothing machine are separate items in the same collection, not hand sponges.
Orders are processed the same day where stock allows, and Renders World delivers kerbside on all consignments — a site-wide policy rather than anything specific to this sponge. Add it to a render, grout or adhesive order and it travels in the same consignment, which keeps a small consumable off its own delivery charge; the facade residue it lifts usually comes from the silicone render range on the same job.
Buyer Questions on Grout Types, Care and Ordering
How many sponges does one job need?
One per bucket station covers most rooms and elevations. At £5.50 this is the format to buy singly and look after rather than stock in depth, and a cheaper foam sponge alongside it takes the bulk first wipe so the cellulose stays clean for the closing pass.
Is it suitable for epoxy grout?
Yes — INSTAR specifies cement and epoxy grouts for this sponge, which is unusual to see stated on a hand sponge. Follow the grout manufacturer's washing instructions on timing and water changes, since epoxy is far less forgiving of a late start than cement.
How does it differ from the foam sponges in the range?
By material and by thickness. This is the only cellulose sponge stocked, at 30 mm against 50 to 80 mm on the foam formats, and it carries the manufacturer's epoxy-grout scope and profiled-edge design. No absorbency figures are published for any sponge in the range, so a side-by-side performance claim would not be supportable.
Can it be reused after it dries out?
Yes. Cellulose stiffens as it dries and softens again once soaked, so a dry sponge in the van is simply a sponge waiting for water. Rinse it clean at the end of the job before it dries, since residue left in the body sets hard inside it.
How should it be cleaned and stored?
Squeeze it out deliberately in clean water rather than dunking it, then let it dry fully before it goes back in the box. INSTAR describes the sponge as durable under intensive use, and drying it out between jobs is what keeps that true and keeps mould from developing.
Technical Documentation — INSTAR Cellulose Sponge