“Open time is too short again – let's add more cellulose ether.” This is the instinctive reaction of many tile adhesive formulators when faced with open‑time issues. Unfortunately, this approach often makes things worse. Increasing HPMC dosage may extend open time marginally, but it also raises viscosity, worsens trowelability, and can even reduce bond strength
“This HPMC solution is crystal clear – it must be premium grade.” “It dissolves in seconds – definitely top quality.” These assumptions are common. And they are also only half true. Clarity and dissolution speed are helpful indicators, but they do not tell the whole story. Relying on them alone can easily mislead you into
“RDP is too expensive – can we use more cellulose ether instead?” This is one of the most frequently asked questions among mortar formulators. Redispersible polymer powder (RDP) typically costs several times, or even more than ten times, the price of cellulose ether. With ever‑increasing cost pressures, using modified cellulose ether to partially replace RDP
