Available SNF grades

FDN-I

FDN-I is listed in powder and liquid forms. The brochure reports a water-reduction range of 15-25%, an initial and final setting-time difference of -90 to +120 minutes, air content no greater than 3.0%, and a 28-day shrinkage ratio no greater than 135%. Its performance description includes increased slump, no bleeding or segregation, low dosage with high strength, cement saving, and improved impermeability, corrosion resistance, and durability. 

FDN-II slow-setting

FDN-II is identified as a slow-setting grade. The brochure lists a dosage range of 0.7-1.5%, water reduction of at least 15%, customizable setting behavior based on project needs, air content no greater than 4.5%, a 28-day shrinkage ratio no greater than 135%, and high efficiency in slump retention. 

Technical specifications

Property	FDN-I	FDN-II slow-setting
Recommended dosage by mass of cementitious materials	Powder: 0.5-1.0% Liquid: 1.5-3.0%	0.7-1.5%
Water reduction rate	15-25%	>=15%
Setting-time difference initial and final	-90 to +120 min	Customizable based on project needs
Air content	<=3.0%	<=4.5%
28-day shrinkage ratio	<=135%	<=135%
Compressive strength ratio	1 d >=140% 3 d >=130% 7 d >=125% 28 d >=120%	7 d >=125% 28 d >=120%
Published performance points	Slump increase by 10-20 cm No bleeding or segregation Low dosage and high strength; cement saving 10-20% Improves impermeability, corrosion resistance, and durability	High efficiency in slump retention

Source note  All SNF values and performance statements in this table are transcribed from brochure p. 3. The brochure does not identify test standards, cement type, mix design, temperature, curing regime, or statistical tolerance. The 10-20% cement-saving statement is a brochure claim and should be retained only with technical approval and supporting test conditions.

Applications

The brochure lists the following applications for the company’s water-reducer range. It does not assign every application to FDN-I or FDN-II, so confirm grade suitability through project testing and current technical documentation.

• Ready-mix concrete
• Precast concrete components
• High-performance concrete
• Infrastructure and commercial construction projects
• Sea-water and sea-sand concrete
• Project examples shown in the brochure: industrial floors, tunnels, bridges, hydraulic structures, precast components, and wind-power works

Dosage and use

For FDN-I, the brochure recommends 0.5-1.0% for powder and 1.5-3.0% for liquid, measured by mass of cementitious materials. For FDN-II slow-setting, it lists 0.7-1.5% without identifying powder or liquid form. The range-level precautions say to select dosage according to the concrete grade and construction needs, add the product with mixing water or by another suitable method, and control water strictly to prevent segregation. 

Packaging and storage

Item	Brochure guidance
Packaging	25 kg bag; 1,000 kg IBC tank; customized packaging available
Storage	Store in a cool, dry environment and avoid direct sunlight
Shelf life	12 months in original unopened packaging

Source note  This is range-level guidance on brochure p. 2. The brochure does not map each pack type to FDN-I or FDN-II. Confirm the physical form and pack format of the selected grade before publishing or quoting.

Precautions

• Set the dosage according to the concrete grade and construction requirements.
• Add with the mixing water or use another validated addition method.
• Do not mix directly with other admixtures; run compatibility testing before combined use.
• Strictly control mixing water to prevent segregation.
• Confirm the brochure phrase ‘test compatibility before cement replacement’ with the technical team before publishing it. The wording is ambiguous and may be a translation issue.

Selecting between FDN-I and FDN-II

The brochure gives FDN-I a broader set of published values, including powder and liquid dosage ranges, a setting-time difference, and early-age through 28-day strength ratios. FDN-II is specifically labeled slow-setting and is described as efficient in slump retention, with setting behavior customizable to project needs. Final selection should follow laboratory and site trials using the actual cementitious materials and production conditions. 

Call to action

Contact Qiandao New Materials with the required concrete grade, cementitious materials, target workability, setting-time needs, strength schedule, and packaging preference. Request the current technical data sheet and confirm whether FDN-I or FDN-II slow-setting matches the project requirements.

Frequently asked questions

What is SNF naphthalene-based superplasticizer?

The brochure identifies SNF as naphthalene-based superplasticizer and presents it as part of the company’s concrete water-reducer range.

Which SNF grades are listed?

The technical table shows FDN-I and FDN-II (slow-setting). The table layout indicates that these are grades within the SNF family, but the brochure does not expressly define SNF as a synonym for FDN-I. 

What dosage does the brochure recommend for FDN-I?

The listed dosage by mass of cementitious materials is 0.5-1.0% for powder and 1.5-3.0% for liquid. 

What dosage is listed for FDN-II?

The brochure lists 0.7-1.5% by mass of cementitious materials. It does not state whether this value applies to powder, liquid, or a particular concentration. 

What water reduction rates are published?

The brochure reports 15-25% for FDN-I and at least 15% for FDN-II slow-setting. 

Which grade is intended for slower setting or slump retention?

FDN-II is labeled slow-setting and described as having high efficiency in slump retention. The brochure says its setting-time difference can be customized based on project needs. 

How should SNF be stored?

The brochure says to store the product in a cool, dry environment away from direct sunlight. It states a 12-month shelf life in original unopened packaging. 

Can SNF be mixed with other admixtures?

The brochure warns against mixing with other admixtures and also calls for compatibility testing. Test the complete admixture system before use and obtain technical confirmation for the proposed combination. 

PCE polycarboxylate superplasticizer