Description
The Dedra DED77670 plastic pad is the flattening disc in the DED7767 power float system: a 400 mm rigid PVC face with four-point Velcro fixing that sets wall flatness on lime-cement, gypsum, and basecoat surfaces before the texture and closing pads run. Renders World stocks it for floating decorative renders, plinth basecoats, and full interior plaster elevations.
Where the DED77670 Plastic Pad Earns Its Place on UK Render Sites
Unlike foam and sponge discs that refine surface texture, the DED77670 is rigid PVC engineered to lock wall flatness across the full 400 mm contact face on the Dedra DED7767 power float. Browse the wider Renders World power floats and sponges range for the complete pad sequence that begins with this disc.
On a typical UK render or plaster job the plastic stage is where straightness is decided — downstream pads adjust texture, but they cannot rescue a wall that comes off the plastic pass uneven. Trade applicators who treat this disc as a flattening tool rather than a finishing tool consistently produce elevations that close cleanly two pad changes later, and the gain shows up most clearly on long, uninterrupted runs of plaster.
Why This PVC Plastic Pad Saves Time on Site
- Rigid PVC working face: stiffer than foam or sponge, holding flatness across the full 400 mm diameter under continuous load.
- Plaster-tolerant material: PVC resists abrasion from sand-cement aggregate and lime fines that quickly degrade softer foam discs.
- Four-point Velcro fixing: grips firmly under continuous rotation; no centre-bolt loosening or mid-pass slip.
- True 400 mm coverage: larger contact face than 375 mm class machines, cutting pass count and visible track lines on long elevations.
- Direct fit DED7767 platform: matches the host machine without an adapter, so pad changes during a finishing sequence take seconds.
Technical Specifications — DED77670 Plastic Disc Data
| Property | Value |
|---|---|
| Disc material | PVC (rigid plastic) |
| Working diameter | 400 mm |
| Mounting system | Hook-and-loop (Velcro), four-point |
| Host machine | Dedra DED7767 power float |
| Workflow position | Flattening stage — after stripping, before polystyrene texture-setting |
| Compatible substrates | Lime-cement plaster · gypsum plaster · render basecoats |
| Manufacturer reference | DED77670 (Dedra, Poland) |
The values above are confirmed against the Dedra manufacturer specification for the DED77670 disc. The 400 mm diameter and four-point Velcro pattern match the DED7767 mounting plate directly, which is what allows the same machine to carry every pad in the finishing sequence without an adapter.
How to Use the DED77670 Effectively on UK Sites
The rigid PVC face works best with light, even pressure across the full 400 mm contact area. Loading one edge tilts the disc and prints arc marks into the plaster that the next stage struggles to remove, so the technique is straight overlapping arcs with the machine moving continuously rather than dwelling in one spot.
Approach a freshly applied plaster or basecoat in this sequence: confirm the substrate is within its working window — firm enough to take the disc, still workable enough to flatten — engage all four Velcro corners onto the mounting pad, then float the elevation in overlapping arcs across the wall. Keep the pressure even from one corner of the disc to the other; the 400 mm face does the work when it sits flat against the substrate.
For the full pad sequence from stripping through to final closing, and the temperature and humidity ranges that govern UK power-float work, the power floats for render finishing guide covers each stage with technique notes from UK installers.
Installation Notes — Mounting, Pressure, Replacement
Engage all four Velcro corners onto the DED776701 mounting pad before powering up the machine. A partly-engaged disc creeps under load and prints uneven arcs into the plaster — visible immediately and difficult to correct once the surface starts setting. A quick brush-down of the Velcro on both faces between elevations keeps the four-point grip at full strength.
Light, even pressure across the disc produces the cleanest flattening result. Forcing the PVC face into the substrate tilts the disc, glazes the working surface faster, and leaves arc marks that the polystyrene and sponge stages cannot fully refine. The technique that consistently works is moderate downforce with continuous motion across the full elevation.
Replace the disc once the PVC face starts skating across the plaster rather than cutting it. Glazing shows up as a polished band that resists fresh plaster purchase, and from that point the disc costs more in re-floating time than a fresh disc costs to fit. Finishing trades typically rotate two discs across a working day to keep flatness consistent on the last elevation.
How the DED77670 Compares to Sibling Finishing Pads
The DED77670 starts the three-disc finishing sequence on the Dedra DED7767. The table below shows its position relative to the two pads that follow it on the same machine.
| Variant | Key Spec | When to Choose |
|---|---|---|
| DED77670 plastic pad | Rigid PVC, 400 mm | Flattening stage — sets wall straightness |
| DED77674 polystyrene pad | Styrofoam face, 400 mm | Mid-stage closing of binder face |
| DED77671 sponge pad | PU foam face, fine closing | Final closing pass and texture refinement |
The three discs are sequential rather than alternative on most jobs: the plastic pad flattens, the polystyrene disc closes the binder face, and the sponge pad refines the final texture. Operators choose between them by workflow stage, not by preference — which is why finishing trades using the Dedra system typically carry all three on the same machine.
How Pros Get the Best Result From This Plastic Pad
Experienced operators treat the DED77670 as the disc that decides whether the wall is ever truly flat. The pattern below is what consistently delivers a straight, even substrate ready for the next stage.
- I treat the plastic stage as flattening, not finishing: the surface should not look "done" when this disc comes off the wall.
- I keep pressure even across the disc face: tilting one corner prints arcs that downstream pads cannot remove.
- I work overlapping passes in straight arcs: dwelling in one spot glazes the PVC and skates over the plaster rather than cutting it.
- I rotate two discs on long jobs: a glazed disc costs more in re-floating than a fresh disc costs to fit.
- I brush the Velcro between elevations: embedded plaster fines on either face cost grip before they cost anything else, and grip loss prints into the finish.
Is the DED77670 Plastic Pad Right for Your Job?
The disc is a flattening tool with a specific workflow position. The bullets below help confirm where it fits.
- Floating lime-cement, gypsum, or basecoat surfaces on the DED7767: a strong fit — the rigid PVC face holds flatness across the full 400 mm contact diameter.
- Initial surface preparation with bonded coatings to remove: use the DED77675 stripping disc instead — the plastic pad is for floating, not for stripping bonded material.
- Mid-stage texture-setting after flattening: the DED77674 polystyrene pad closes the binder face — the natural next step after this disc.
- Decorative silicone or silicate render topcoats: these finishes are typically hand-floated with a plastic trowel; power-floating is generally avoided for decorative thin-coats because the binder is formulated for hand application.
- Operators without the DED7767 host machine: the disc fits the Dedra platform only — confirm machine model before ordering.
Order the DED77670 alongside the matching mounting carrier and the remaining pads in the Dedra finishing sequence, or contact the Renders World technical desk for advice on building the complete pad workflow for a specific plaster or render specification.
FAQ — DED77670 Use, Compatibility, Replacement
Which machine does the DED77670 fit?
The Dedra DED7767 power float. The 400 mm working diameter and four-point Velcro pattern match the DED7767 mounting plate through the DED776701 carrier — no adapter required. Smaller Dedra machines in the 375 mm class and other manufacturers' power floats use different geometry and will not match reliably.
How long does one DED77670 disc typically last in render service?
Working life depends on substrate aggressiveness and operator pressure, but a PVC plastic disc generally outlasts a polystyrene disc on equivalent finishing work because the rigid face resists abrasion from sand-cement aggregate better than foam. Replace once the surface glazes or the Velcro backing softens — both are signals that downstream pads will struggle to recover the finish.
How does the plastic disc differ from the polystyrene pad?
The DED77670 plastic disc is the flattening tool — it sets the plane of the wall during the first finishing pass. The DED77674 polystyrene disc follows, closing the binder face once flatness is established. The two are sequential, not alternative; most professional finishing sequences use both, in that order, before the sponge close.
What is the difference between the DED77670 plastic pad and the DED776701 mounting pad?
The DED77670 is the working PVC float disc — the wear face that contacts the plaster. The DED776701 is the mounting carrier that fits between the machine head and the working disc, providing the four-point Velcro surface that the float disc engages. Both are part of the DED7767 system, with different roles in the assembly.
Can the disc be used on freshly applied silicone or thin-coat decorative renders?
Decorative silicone, silicate, and acrylic thin-coat finishes are typically hand-floated with a plastic trowel rather than power-floated, because the binder chemistry in these systems is designed for hand application. The DED77670 is the right tool for lime-cement, gypsum, and basecoat floating — not for decorative topcoat texture-setting.
How should the disc be cleaned and stored between jobs?
Knock off plaster while the residue is still fresh — once cured, build-up is harder to remove without damaging the PVC face or the Velcro backing. Store the disc flat in a dry container; folded or compressed storage distorts the working face and undermines the even contact pattern that makes the 400 mm coverage effective.