Frequent Questions(Q) and Answers(A)  


Q1 How many types of naphthalene sulphonate formaldehyde condensates sodium salts do you have? 

A:we have two types of naphthalene sulphonate formaldehyde condensates sodium salts powder according to sodium sulfate it contains,Type one:Sodium sulfate contained 5%max(FDN-A),Another type sodium sulfate contained 20%(FDN-C).

Q2 What is the difference between naphthalene sulphonate formaldehyde condensates sodium salts powder( sodium sulfate 5% contained(FDN-A) and sodium sulfate 20% container(FDN-C)?

A:The main differences are the effective ingredient polynaphthalene sulfonate formaldehyde materials contents and sodium sulfate content,FDN-A contains higher concentration of ingredient materials and has better performance for concrete,it requires to add lower rate of concrete admixture to get same concrete performance.and in the other hand,sodium sulfate influences concrete performance to different extents according to it is contained in the FDA,and In cold weather winter, when temperature drops to below 5℃,sodium sulfate will crystallize out.

Q3 Do you have naphthalene sulphonate formaldehyde condensates sodium salts liquid form?

A:We also have liquid form of naphthalene sulphonate formaldehyde condensates sodium salts,but it is not convenient for long distance transportation,and results expensive transportation cost,and the packing cost for liquid form FDN is very expensive too.This two factors result liquid form of naphthalene sulphonate formaldehyde condensates sodium salts price is not competitive after long distance transportation.

Q4 What is the function of sodium gluconate powder in concrete admixture?


A:Sodium gluconate is used as set retarding agent for concrete based on its hydration control feature to concrete,keep good slump retention in long time,keep commercial concrete excellent workability after long distance transportation in hot weather summer.


Q5 What is the proper adding rate of sodium gluconate? 

A:Sodium gluconate is recommended to add at rate of 0.03%-0.07% of cement.Before adding sodium gluconate,it should do tests to determine the proper adding rate according to cement and other materials used.

Q6 What is the difference between sodium lignosulphonate and calcium lignosulphonate in concrete application?

A:Both sodium lignosulphonate and calcium lignosulphonate can be used in concrete as a water reducing agent and superplasticizer,at the same time,both these materials have set retarding function for concrete,but calcium lignosulfonate has calcium iron(Ca 2+),it can accelerate hydration of cement,so setting time for concrete that has added calcium lignosulphonate is shorter than concrete that has added sodium lignosulphonate.

Q7 What is the difference between of polycarboxylate ether liquid 40% and polycarboxylate ether liquid 50% except the contents?

A:There is no difference except the polycarboxylate ether content is different,same function,but polycarboxylate ether liquid 50% is more thicker and more sticky.


 Q8 Can Polycarboxylate ether liquid be used directly to concrete?

A:Polycarboxylate ether is the main ingredient for polycarboxylate based superplasticizer and concrete admixtures for high performance concrete,use only polycarboxylate ether liquid directly to concrete,it can improve concrete compressive strength etc. But normally,It is used to formulate with other additives to form a certain feature and function polycarboxylate based concrete admixture according to projects requirement,for example,early strength type admixture,water reducing type admixture,slump retention type admixtures.

Q9 What is the difference between polycarboxylate ether concentrated powder and polycarboxylate ether dry mix powder?

A:Polycarboxylate ether concentrated powder is concentrated from liquid form polycarboxylate ether,and polycarboxylate ether content is 98%,it is concentrated from liquid to powder on the purpose of convenient transportation and lower transportation cost.When it is used in destination,it is suggested to dissolve it into water solution with 20%,or 40% or 50% solid content.

And polycarboxylate ether dry mix powder,it is produced in spray-dry process,it can be used directly to concrete,and has a wide range of applications,see details in our technical data sheet(TDS) for polycarboxylate ether dry mix powder.