---
product_id: 386129215
title: "SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch)"
brand: "signi"
price: "HK$423"
currency: HKD
in_stock: true
reviews_count: 5
category: "Signi"
url: https://www.desertcart.hk/products/386129215-signi-s-c-plastic-back-grinding-disc-for-granite-marble
store_origin: HK
region: Hong Kong
---

# Lasts 7-10x longer than aluminum oxide discs Cuts faster than conventional discs 7-inch diameter for versatile grinding SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch)

**Brand:** signi
**Price:** HK$423
**Availability:** ✅ In Stock

## Summary

> ⚡ Grind smarter, not harder—upgrade your toolkit with SIGNI’s powerhouse disc!

## Quick Answers

- **What is this?** SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) by signi
- **How much does it cost?** HK$423 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/386129215-signi-s-c-plastic-back-grinding-disc-for-granite-marble)

## Best For

- signi enthusiasts

## Why This Product

- Trusted signi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No Backup Pad Needed:** Plastic back design eliminates extra accessories, streamlining your workflow
- • **Aggressive Yet Gentle:** Removes overfilled materials efficiently without harsh scratching—perfect for polished concrete
- • **Multi-Surface Mastery:** Optimized for granite, marble, concrete, and glass—one disc to rule them all
- • **Durability That Outlasts:** Engineered to last up to 10 times longer, saving you time and money
- • **Faster Cuts, Less Loading:** Innovative design minimizes material buildup, boosting grinding speed and efficiency

## Overview

The SIGNI S/C Plastic Back Grinding Disc is a 7-inch, 36 grit medium abrasive tool designed for professional-grade grinding on granite, marble, concrete, and glass. Featuring a plastic back that removes the need for a backup pad, it offers 7-10 times longer life than traditional aluminum oxide discs. Its innovative design reduces material loading and accelerates cutting speed, making it ideal for polished concrete and coating professionals seeking precision and durability.

## Description

This disc has a plastic back and does not require a backup pad.

Review: Works perfect, good buy.
Review: We use this discs when filling control joints in warehouses with polyurea joint filler compounds. This disc is aggressive enough to remove the overfilled material, but does not leave significant scratching on the concrete. This is great to use when we are only filling joints and not grinding the entire concrete slab. It is a great option for polished concrete and coating professionals/DIY'ers.

## Features

- 7" S/C 36 Grit Disc, 1 Pack.
- This disc has a plastic back and does not require a backup pad.
- It lasts up to 7-10 times longer than conventional aluminum oxide resin fiber discs.
- Its design minimizes the loading of material being ground on the disc.
- It cuts faster than a conventional grinding disc

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0892P7LCW |
| Batteries Required? | No |
| Batteries included? | No |
| Customer Reviews | 4.3 4.3 out of 5 stars (61) |
| Date First Available | 22 May 2020 |
| Grit Description | Medium |
| Grit Number | 36 |
| Item Weight | 200 g |
| Item thickness | 5 Millimetres |
| Manufacturer | SIGNI INDUSTRIAL (SHANGHAI)CO.,LTD |
| Material | 36 Grit |
| Product Dimensions | 17.78 x 17.78 x 0.25 cm; 200 g |
| Size | 7 Inch |

## Product Details

- **Brand:** SIGNI
- **Compatible devices:** Angle Grinder
- **Grit material:** Aluminium Oxide
- **Grit type:** Medium
- **Product dimensions:** 17.8L x 17.8W centimetres

## Images

![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) - Image 1](https://m.media-amazon.com/images/I/41d9FR8y39L.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) - Image 2](https://m.media-amazon.com/images/I/517XR9iCPyL.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) - Image 3](https://m.media-amazon.com/images/I/518xAcrqwVL.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) - Image 4](https://m.media-amazon.com/images/I/51XexW+Sj+L.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 7 inch) - Image 5](https://m.media-amazon.com/images/I/51a+cuh1MuL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by K***. on 9 January 2026*

Works perfect, good buy.

### ⭐⭐⭐⭐⭐ Review
*by D***W on 6 November 2024*

We use this discs when filling control joints in warehouses with polyurea joint filler compounds. This disc is aggressive enough to remove the overfilled material, but does not leave significant scratching on the concrete. This is great to use when we are only filling joints and not grinding the entire concrete slab. It is a great option for polished concrete and coating professionals/DIY'ers.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 17 April 2025*

These are awesome for fiberglass, fixing an old boat, it just literally chunks it out, even use it too cut too. They last a long time

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**Shop now:** [https://www.desertcart.hk/products/386129215-signi-s-c-plastic-back-grinding-disc-for-granite-marble](https://www.desertcart.hk/products/386129215-signi-s-c-plastic-back-grinding-disc-for-granite-marble)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-19*