W-42 SL Superplasticizer

Carboxylated type for high flow and high water reduction with improved bleed water control. Complies with ASTM C-494 Type F specifications.


Specco W-42 SL plasticizer is a modified polycarboxylated high range water reducing admixtures formulated to produce self-compacting type (S.C.C.) concrete. W-42 SL plasticizer is specifically intended for use in precast and ready mix concrete providing high workability, slightly extended slump life, and improved fluidity with reduced or minimal vibration. The improved dispersing action of W-42 SL plasticizer results in concrete with “self placing” properties that surpass conventional superplasticizer benefits. Very low water to cement ratios can be obtained with as much as 25-30% total water reduction.


  • Greater water reduction and lower dosage rates than traditional melamine or naphthalene based superplasticizers.
  • Improved flow (self leveling) with self-healing rheology.
  • High early strengths.
  • Improved densification of surfaces.
  • Reductions in vibration and manufacturing noise levels.

COMPOSITION: Modified polycarboxylate polyester solution. W-42 SL plasticizer does not contain any calcium chloride or intentionally added chlorides that would initiate or promote corrosion of reinforcement steel, or contribute to efflorescence.

TECHNICAL DATA: W-42 SL plasticizer is formulated to comply with ASTM C-494 requirements for Type F high range water reduction. W-42 SL plasticizer is fully effective and compatible with most concrete admixtures, however, each admixture should be added separately to the concrete mix (see Cautions). By adding fluidity to the mix, W-42 SL plasticizer liquid allows extended workability. The duration of workability depends on temperature, brand and type of cement, aggregate type and gradation, method of mixing, and method of transport. Concrete mixes containing higher overall cement “sulfate” content give easier fluidification of the mix than low sulfate cements. When added at normal dosages, W-42 SL plasticizer will not significantly affect the concrete’s heat of hydration. Specco W-42 SL plasticizer is compatible with most mineral and chemical components common to Portland cement, calcium alumina cement, and calcium sulfate (gypsum)

DOSEAGE RATES: Specco W-42 SL plasticizer is normally dosed as supplied at a rate of 6-8 ounces per 100 lbs. of cement (390– 520ml/100 kg). Other dosages may be required depending on specific conditions. W-42 SL plasticizer’s improved flow properties allow typical dosage rates approximately 40% less than of standard melamine and naphthalene based superplasticizers, while maintaining the same percent water reduction.

AVAILABLE IN: 5 Gallon (18.9 L) pails, 55 gallon (208 L) drums, 265 gallon (1000 L) containers.