# KA340A Construction Sealant

> Flexible sealant for concrete joints, tunnels and drainage.

Model: KA340A · Family: Construction joints · Source: https://karmindadhesive.com/products/ka340a-construction-sealant/

## What it is

One-component moisture-curing polyurethane construction sealant for joints in concrete and stone; flexible, puncture resistant, repairable, high modulus and water-pressure resistant.

## Specification (typical values)

| Test | Standard | Typical value | Method |
|---|---|---|---|
| Appearance | — | Black / White / Gray | — |
| Density (g/cm³) | 1.45±0.1 | 1.46 | GB/T 13477.2 |
| Sag resistance (mm) | ≤3 | 0 | GB/T 13477.6 |
| Skin time (min) | 60–90 | 65 | GB/T 13477.5 |
| Cure rate (mm/day) | ≥3.0 | 3.0 | HG/T 4363 |
| Volatile content (%) | ≤8 | 1 | GB/T 2793 |
| Shore A hardness | 30–40 | 35 | GB/T 531.1 |
| Tensile strength (MPa) | ≥2 | 2.5 | GB/T 528 |
| Elongation at break (%) | ≥600 | 615 | GB/T 528 |
| Elastic recovery (%) | ≥70 | 75 | GB/T 13477.13 |
| Extrusion rate (ml/min) | ≥250 | 300 | GB/T 13477.4 |

## Packaging

| Format | Size | Carton / unit |
|---|---|---|
| cartridge | 310 ml | 12 / 20 / 24 pcs |
| sausage | 400 / 600 ml | 20 pcs |
| barrel | 200 L / 250 kg | — |

## Where it is used

- Joints in underground tunnels and bridge tunnels
- Drainage and sewer pipe joints
- Epoxy floors and concrete joints
- Sealing wall and floor penetrations

## Catalogue notes

- Elastic recovery is cited as GB/T 7124 in one edition of the brochure and GB/T 13477.13 in the other; GB/T 7124 is a shear-strength standard, so the 13477 series applies here.

## Ordering

Prices are quoted per order. Email martin@karmindadhesive.com with model, quantity, pack format, destination and substrate.