---
product_id: 508856886
title: "SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch)"
brand: "signi"
price: "R$384"
currency: BRL
in_stock: true
reviews_count: 8
category: "Signi"
url: https://www.desertcart.com.br/products/508856886-signi-s-c-plastic-back-grinding-disc-for-granite-marble
store_origin: BR
region: Brazil
---

# 7-10x longer life than aluminum oxide 36 Grit Silicon Carbide - ultra aggressive Plastic Back - no backup pad needed SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch)

**Brand:** signi
**Price:** R$384
**Availability:** ✅ In Stock

## Summary

> ⚡ Grind like a pro, finish like a boss.

## Quick Answers

- **What is this?** SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) by signi
- **How much does it cost?** R$384 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/508856886-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

- • **Durability That Outlasts:** Lasts up to 10 times longer than traditional resin fiber discs—less downtime, more productivity.
- • **No Backup Pad, No Hassle:** Plastic backing design lets you attach directly to your grinder, saving setup time and weight.
- • **Cut Faster, Grind Smarter:** Silicon Carbide grit delivers aggressive, efficient material removal for pro-level results.
- • **Versatile Multi-Surface Use:** Perfect for granite, marble, concrete, and glass—one disc to rule your projects.
- • **Smooth Finish, Minimal Loading:** Innovative design reduces material buildup on the disc, ensuring consistent grinding performance.

## Overview

The SIGNI S/C 4.5-inch 36 Grit Plastic Back Grinding Disc is engineered with aggressive silicon carbide grit and a unique plastic backing that eliminates the need for a backup pad. Designed for high-speed grinders up to 13,300 RPM, it offers 7-10 times longer life than conventional discs while delivering faster, smoother grinding on granite, marble, concrete, and glass surfaces. Ideal for professionals and serious DIYers seeking efficiency, durability, and precision in one pack of five.

## Description

S/C (Silicon Carbide) These grain types are very aggressive. The grinding disc is flat with a plastic back. The sanding disc fits most angle grinders and does not require a backing pad. The grinding disc attaches directly to the hand of the grinding machine. In comparison to depressed center wheels or resin fiber discs it is lighter, cuts faster, and grinds faster while leaving an even surface. Qty included : 5 Pcs 4.5" grinding disc in one pack.

Review: Good buy - Works perfect, good buy.
Review: Works great to grind polyurea joint filler - 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

- 4 1/2" SiC 36 Grit Disc, 5 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 | B0892PNY65 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #42,331 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #70 in Grinding Discs |
| Brand | SIGNI |
| Compatible Devices | Angle Grinder, Bench Grinder, Die Grinder |
| Construction Type | Grinding |
| Customer Reviews | 4.3 4.3 out of 5 stars (62) |
| Date First Available | May 22, 2020 |
| Grit Material | Silicon Carbide |
| Grit Number | 36 |
| Grit Type | Coarse |
| Item Thickness | 5 Millimeters |
| Item Weight | 12 ounces |
| Item model number | 793513613569 |
| Manufacturer | SIGNI INDUSTRIAL (SHANGHAI)CO.,LTD |
| Material | 36 Grit |
| Maximum Rotational Speed | 13300 RPM |
| Product Dimensions | 4.5"L x 4.5"W |
| Recommended Uses For Product | Grinding |
| Size | 4.5 inch |
| UPC | 793513613569 |

## Product Details

- **Brand:** SIGNI
- **Compatible Devices:** Angle Grinder, Bench Grinder, Die Grinder
- **Grit Material:** Silicon Carbide
- **Grit Type:** Coarse
- **Product Dimensions:** 4.5"L x 4.5"W

## Images

![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) - Image 1](https://m.media-amazon.com/images/I/41TwmaHQg3L.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) - Image 2](https://m.media-amazon.com/images/I/51Gk8pLes-L.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) - Image 3](https://m.media-amazon.com/images/I/51Ku6UCBhhL.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) - Image 4](https://m.media-amazon.com/images/I/51q6T+pb-ZL.jpg)
![SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch) - Image 5](https://m.media-amazon.com/images/I/81fb71QpUJL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good buy
*by K***. on January 9, 2026*

Works perfect, good buy.

### ⭐⭐⭐⭐⭐ Works great to grind polyurea joint filler
*by D***W on November 6, 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.

### ⭐⭐⭐⭐⭐ Best Grinding disc
*by A***R on April 17, 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

## Frequently Bought Together

- SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch)
- SIGNI 5 Pack SiC Plastic Back Grinding Wheel for Granite/Marble/Concrete and Glasses (4.5 INCH, 24 GRIT)
- BHA Silicon Carbide Semi-Flexible Masonry and Coating Removal Sanding Disc, 4.5" x 7/8" - 5 Pack (60 Grit)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-03-07*