SPS-21 Water Reducing and Slump Retention Type Polycarboxylate Superplasticizer PCE Powder


SPS-21 is a new generation of Eco-friendly high performance polycarboxylate ether superplasticizer powder developed by our company with EPEG 912 with M.W.: 3000 as main raw material.

Product details

Technical Principle

The main chains of the high performance polycarboxylate water reducing agent molecular are absorbed onto the surface of the cement granules, which can effectively hinder the hydration, enhance  fluidity retention ability, the branch chains surrounded by the cement granules, play dual roles of steric hindrance and electrostatic repulsion, it is totally different from conventional water reducing agents, so the high performance polycarboxylate water reducing agent has better dispersion and water reducing effect.


1) Polycarboxylate ether superplasticizer powder with solid content: 97% min. (Completely soluble in water. If it is used for ready mix concrete , please add PCE powder to water to get a solution with solid content 20% or 10% before use ).
(2) With a good slump retention ability, enhance cohesion, without concrete segregation.
(3) With a good dispersion, an excellent adaptability to different cements, and good water-reducing properties.

(4) Having a thermostability to 50℃ (fifty degree celsius centigrade).

Quality Specification






White or light yellow powder

Bulk Density



pH (23℃)



Solid Content







Water Reducing Ratio






Alkali content




1. It is applicable to various ready mix concrete and especially dry mix mortar. 

2. It is specially used for both gypsum based and cement based dry mix mortar.

3. It is especially for cementitious self-levelling underlayments (SLU), plaster and masonry, non-shrink grouts, pressed cement slurry, self-leveling floor screeds, waterproofing mortar, repair mortars, injection mortars, dry mix concrete, tiles adhesives and joint fillers.

Usages and Cautions:
(1) A recommended dosage is 0.1%-0.5% by the weight of cementitious materials. Optimized dosages should be determined by mixture design test.
(2) Tests must be carried out before utilization.
(3) This product is forbidden to be mixed with naphthalene sulphonate.
(4) Compatibility test must be done when it is used together with other admixtures.

Package: Packed in 25kg plastic woven bags with PE inner liner, 16 mt with pallets loaded in one 20GP, 27 mt with pallets loaded in 40HC by sea, 25.5 mt with pallets loaded in 40HC by train

Storage & Transport: Stored in a dry place with a normal temperature (below 40℃), no stacking or great pressure to avoid caking. This product shall be transported according to general chemical products.

Shelf time: 0℃-40, the shelf life is 12 months in the original packageIt should be used within 60 days in case of opening the original package.