Deinking & Bleaching Agent FAS for Pulp

Reductive agent dedicated to pulp bleaching and waste-paper deinking

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Product Description

FAS is a stable, non-toxic, and environmentally friendly reducing agent. It is widely used in the papermaking industry as an excellent alternative to Sodium Hydrosulfite. It provides superior performance in pulp bleaching and deinking processes, characterized by high reduction potential and excellent whiteness stability.

Physical Properties

Appearance	White crystalline powder
Chemical Name	Formamidine Sulfinic Acid (FAS)
Stability	Stable under dry conditions; decomposes in hot water or alkaline solutions to release sulfoxylic acid.

Key Advantages

High Efficiency: Offers higher reduction potential and better bleaching effects compared to Sodium Hydrosulfite.
Safety & Eco-friendly: Non-flammable, odorless, and safer to handle. It significantly reduces environmental pollution compared to traditional reducing agents.
Stability: Excellent storage stability, non-hygroscopic.
Cost-effective: Lower dosage requirement achieves the same bleaching effect, reducing overall chemical costs.

Applications & Recommended Dosage

FAS is suitable for bleaching of mechanical pulp, chemical pulp, and deinking of waste paper.

Application Process	Recommended Dosage	pH Condition	Temperature
Pulp Bleaching	0.05 - 0.3% (o.d. pulp)	Alkaline (pH 8-10)	50 - 70°C
Waste Paper Deinking	0.1 - 0.5% (o.d. pulp)	Alkaline (pH 8-10)	50 - 60°C

The specific dosage should be adjusted according to the pulp type and desired whiteness. A small-scale trial is recommended before mass production.

Quality Specification

Purity	≥ 99.0%
Moisture	≤ 0.1%
Iron(II)	≤ 10 ppm
Appearance	White crystalline powder

Storage and Handling

Store in a cool, dry, and well-ventilated area. Keep away from moisture, heat, and direct sunlight. Avoid contact with strong oxidizing agents. Please refer to the Safety Data Sheet (SDS) for detailed handling and first-aid measures.

Need a COA, SDS or a sample? Contact us — we reply within one working day.

Deinking & Bleaching Agent FAS for Pulp