Sia Siafast 5 Inch Hook and Loop Backup Pad, Soft Edge

Description

The Siafast pad gives random orbital and dual-action sanders a soft, flexible cushion between the tool and the abrasive disc. Soft edge construction lets the pad flex into curves, moldings, and contoured panels without leaving flat spots or witness lines in the finish. The hook face grips Siafast and other hook and loop sanding discs securely through aggressive stock removal and fine finishing passes alike, and it releases a spent disc in seconds so a shop can change grits without losing rhythm mid-job.

Sia builds this backup pad line in more than one edge density and thickness so the platform hardness matches the surface being worked. Soft edge is the right call for anything with a crown or contour, since a firm pad in that spot flattens the curve instead of following it. Pair density choice with the disc grit sequence you are already running and the pad becomes a consistent part of the finishing schedule rather than a variable to compensate for.

Where the Siafast pad is used

• Automotive body shops shaping filler and primer on fenders, quarter panels, and hoods, where the soft edge follows the panel’s crown instead of flattening it
• Marine and RV finishing on curved fiberglass and gelcoat surfaces that punish a rigid pad with flat spots
• Furniture and cabinet shops sanding profiled edges, moldings, and turned components by hand-held random orbital tool
• Composite and solid surface fabricators working rounded or contoured stock ahead of a final finish coat

How the Siafast pad holds up

The soft edge density absorbs pressure at the pad’s perimeter instead of digging in, which keeps disc contact even across a curved surface and extends disc life by spreading wear across the full face rather than concentrating it at one edge. The no-hole (NH) design keeps the pad simple to mount on tools without a dust extraction port, and the 1/2 inch thickness gives enough cushion to work contours without sacrificing control on flat panels.

Keep the hook face clear of dust buildup between disc changes. A hook face clogged with sanding dust loses grip on the disc’s loop backing and lets it slip under load, which shows up in the finish as chatter marks and uneven scratch patterns that have to be sanded out again.

Backup pad specs

• Diameter: 5 in
• Thickness: 1/2 in
• Hole pattern: NH (no holes)
• Edge density: Soft
• Attachment: Hook and loop
• Compatible discs: Siafast and standard hook and loop sanding discs, 5 in diameter

Order the Siafast pad in the diameter, thickness, and edge density that matches the sanding discs and profile you are working. Browse Chemical Concepts abrasives for matching Siafast discs and interface pads, or see sia’s full backup pad line at siaabrasives.com.

Need Help?

Need help matching a backup pad density to your sanding discs and finish requirements? Call (800) 220-1966 or email [email protected].