KingAdd 80WP®
Silicone-based water-repellent powder admixture for the integral hydrophobation of cementitious dry mortars, renders and plasters.
SpecWorld has the Spec Pack, CSI specification and drawings for registered specifiers.
Overview
KingAdd 80WP is a silicone-based, water-repellent powder admixture used for the mass (integral) hydrophobation of cementitious dry-mix formulations. Blended into the dry components before gauging with water, it distributes throughout the hardened material to reduce capillary water absorption and produce a durable water-repellent (hydrophobic) matrix, while retaining good water-vapour permeability.
KingAdd 80WP also reduces efflorescence by limiting the ingress and transport of water-soluble salts, lowers chloride absorption and increases the durability of the finished mortar. It is highly resistant to alkalis, free-flowing and easily incorporated into the dry mix.
Where to use
KingAdd 80WP is especially recommended for the integral hydrophobation of cementitious materials, including:
- Cement-based construction materials
- Mineral mortars and grouts
- Renders and plasters
- Joint fillers and sealing mortars
- Levelling compounds and skim coats
- Tile adhesives and dry-mix mortars
Why use it
- Reduces capillary water absorption
- Reduces efflorescence – limits the ingress and transport of water-soluble salts
- Reduces chloride absorption
- High resistance to alkalis
- Increases the surface hydrophobicity
- Good water-vapour permeability
- Increases the durability of cementitious building materials
- Good flowability – blends homogeneously into the dry mix
Technical properties
| Chemical basis | Silicone-based hydrophobic powder |
|---|---|
| Appearance | White powder |
| Apparent (bulk) density | 750 - 990 g/l |
| Recommended dosage | 0.1 - 1.0 % by dry mortar weight |
| Frost sensitivity | Not sensitive to frost |
| Storage temperature | Up to +30°C |
| Shelf life | 12 months |
How to use
Method of use
Dosage
The typical addition rate is 0.1 – 1.0 % of KingAdd 80WP by weight of the dry mortar, depending on the formulation and the degree of hydrophobation required. The optimum dosage must be established by trials.
Mixing
Add KingAdd 80WP to the dry components of the mortar and blend homogeneously before adding the gauging water. Uniform dispersion throughout the dry mix is essential for consistent performance.
There may be differences in strength and shrinkage between a hydrophobic and a non-hydrophobic system; these should be assessed as part of the formulation trials.
Coverage, packaging and storage
Packaging
KingAdd 80WP is available in 20 kg bags.
Storage
Store in closed original packaging in cool, dry conditions at temperatures up to +30°C, protected from direct sunlight and from moisture. KingAdd 80WP is not sensitive to frost. Under these conditions the shelf life is 12 months from the date of manufacture.
Health and safety
As with all chemical products, care should be taken during use and storage to avoid contact with the eyes, mouth, skin and foodstuffs. Avoid inhalation of dust and wear suitable dust protection when handling. Treat any splashes to the eyes and skin immediately; if accidentally ingested, seek medical attention. Use in well ventilated areas.