# KAM921 STP Sealant

> Silyl-terminated polymer sealant: silicone weathering, PU strength, paintable.

Model: KAM921 · Family: Industrial and STP · Source: https://karmindadhesive.com/products/kam921-stp-sealant/

## What it is

One-component moisture-curing silane-modified polyether sealant combining silicone weatherability with polyurethane strength; low odour, mould resistant, paintable, primerless on many substrates, PVC- and solvent-free.

## Specification (typical values)

| Test | Standard | Typical value | Method |
|---|---|---|---|
| Appearance | — | Black / White / Gray | — |
| Density (g/cm³) | 1.45±0.1 | 1.45 | GB/T 13477.2 |
| Sag resistance (mm) | 0 | 0 | GB/T 13477.6 |
| Skin time (min) | 20–40 | 30 | GB/T 13477.5 |
| Cure rate (mm/day) | ≥3 | 3.0 | HG/T 4363 |
| Volatile content (%) | ≤4 | 3 | GB/T 13477.19 |
| Shore A hardness | 35–45 | 40 | GB/T 531.1 |
| Tensile strength (MPa) | ≥1.5 | 1.8 | GB/T 528 |
| Elongation at break (%) | ≥400 | 450 | GB/T 528 |
| Elastic recovery (%) | ≥80 | 100 | GB/T 13477.4 |
| Application temperature (°C) | — | +5 to +35 | — |

## Packaging

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

## Where it is used

- Elastic sealing in the manufacture and repair of vehicles, vessels and industrial equipment
- Self-bonding and mutual bonding between metal, plastic and glass
- Sealing gaps and joints

## Catalogue notes

- One brochure table lists Extrudability (ml/min) where the other lists elastic recovery %; two different properties on the same row, to be confirmed with the factory.
- Elastic recovery cites GB/T 13477.4, which is the extrudability standard.

## Ordering

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