Naphthalene Superplasticizer (Liquid)

Overview

Naphthalene sulfonate formaldehyde condensate — internationally known as BNS or SNF, and as FDN in China — is the longest-established high-range water reducer. It disperses cement particles through electrostatic repulsion.

Key benefits

• Mature raw material supply and process: stable pricing, unaffected by macromonomer market swings
• Good compatibility across cement types, low dosage sensitivity
• Low air entrainment and good surface finish
• Compatible with most retarding and air-entraining components

Application notes

Dosage is higher than for PCE, so accurate metering matters. Products with high sodium sulfate may crystallise at low temperature — choose the low-alkali grade or provide insulation. Do not blend directly with polycarboxylate products.

Typical uses

General-purpose concrete C25–C45, precast elements, pavement concrete, hydraulic concrete.

Typical applications

• General-purpose concrete
• Precast elements
• Pavement concrete
• Hydraulic concrete

Technical specification

Appearance	Brown liquid
Solid content	40% / 45% ± 1%
Water reduction	18% – 25%
pH value	7.0 – 9.0
Density (25°C)	1.18 – 1.24 g/cm³
Sodium sulfate content	≤ 5% (standard) / ≤ 2% (low-alkali)
Chloride content	≤ 0.05%
Cement paste fluidity	≥ 220 mm

Specification values are typical reference figures; the COA of each batch governs. Custom solid content and formulation available on request.