Hydroxypropyl Starch Ether Supplier

Frequently Asked Questions

• Q: Can HPS fully replace cellulose ether in tile adhesive formulations?
• A: No — HPS is best understood as a complementary additive that reduces the required dosage of cellulose ether, not a full substitute. Cellulose ether provides superior water retention efficiency and thermal stability that HPS alone cannot replicate, particularly in demanding applications such as large-format or heated-floor tile installations. A typical optimised formulation uses HPS at 0.1–0.2% alongside a reduced HPMC dosage of 0.15–0.25%, achieving cost savings without compromising adhesion or water retention performance.

• Q: Does HPS affect the setting time of cement-based mortars?
• A: At recommended dosages (0.1–0.3%), HPS has minimal effect on cement setting time. At higher dosages, starch derivatives can cause moderate cement retardation due to adsorption onto calcium aluminate hydration phases. If your formulation requires strict set-time control, we recommend laboratory testing with your specific cement source to confirm acceptable retardation levels before scaling up production.

• Q: What is the shelf life of HPS?
• A: When stored in sealed original packaging in a cool (below 30°C), dry environment below 65% relative humidity, HPS has a shelf life of 12 months. Starch derivatives are more hygroscopic than cellulose ethers, so moisture management during storage and handling is important. Do not store on bare concrete floors — use pallets and avoid areas with condensation or high humidity.

• Q: Is HPS suitable for use in hot and humid climates?
• A: Yes. The hydroxypropyl modification significantly improves stability in hot, humid conditions compared to unmodified starch, which retrogrades rapidly above 30°C. However, finished mortars containing HPS should still be applied and set before extended exposure to high temperatures, consistent with good plastering practice for any cementitious or gypsum product.

• Q: How does HPS interact with RDP in mortar formulations?
• A: HPS and RDP are compatible in mortar formulations and can be used simultaneously. HPS contributes to workability and water retention while RDP improves flexibility and adhesion of the hardened mortar. There is no negative chemical interaction between these two additives. Some formulators use all three — HPMC + HPS + RDP — in premium tile adhesives to achieve the best balance of application properties and hardened mortar performance.

• Q: What raw material source does Yisheng use for HPS production?
• A: Yisheng uses food-grade tapioca starch (cassava-derived) and corn starch from qualified, audited raw material suppliers. Both sources are non-GMO by default; GMO-free certificates can be provided on request. Tapioca-based HPS is preferred for most construction applications due to its lower protein content and whiter appearance. Corn-based HPS is available as an alternative. Please specify your preference when placing an order.