# KA340B Construction Sealant

> Low-movement, water-pressure-resistant grade for tunnels and drainage.

Model: KA340B · Family: Construction joints · Source: https://karmindadhesive.com/products/ka340b-construction-sealant/

## What it is

One-component moisture-curing polyurethane for low-movement, high-penetration-resistance joints; high modulus, water-pressure resistant, solvent- and DOP-free.

## Specification (typical values)

| Test | Standard | Typical value | Method |
|---|---|---|---|
| Appearance | — | Black / White / Gray | — |
| Density (g/cm³) | 1.5±0.1 | 1.5 | GB/T 13477.2 |
| Sag resistance (mm) | ≤0.5 | 0 | GB/T 13477.6 |
| Skin time (min) | 30–60 | 40 | GB/T 13477.5 |
| Cure rate (mm/day) | ≥3.0 | 3.0 | HG/T 4363 |
| Volatile content (%) | ≤3 | 1 | GB/T 2793 |
| Shore A hardness | 40–50 | 48 | GB/T 531.1 |
| Tensile strength (MPa) | ≥1.5 | 2.0 | GB/T 528 |
| Elongation at break (%) | ≥500 | 550 | GB/T 528 |
| Elastic recovery (%) | ≥80 | 80 | GB/T 7124 |
| Extrusion rate (ml/min) | ≥250 | 320 | 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

- Waterproofing on the wet face of bridges, tunnels and drainage pipes
- Bonding and sealing precast panels, concrete internal walls and stone

## Catalogue notes

- Density printed as g/m³; elastic recovery also cites GB/T 7124.

## Ordering

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