Fiber Solutions on Additives and Formulation Guide for Gypsum Plaster, Cement Plaster & Exterior Stucco.
Whether in the application of gypsum plaster, cement plaster, or exterior stucco, the most challenging issues are the same: Cracks, sag, short open time, and drying shrinkage. Celotech is a China TOP supplier specializing in chemical additives for construction solutions and can help you solve common issues with effective plaster fibers and technical support for balancing the whole formulation.
Plaster cracks for the reasons below, and Cellulose fiber can reduce cracking by forming micro-reinforcing networks throughout the plaster matrix.
Unlike standard fibers, Celotech’s Cellulose Fiber Celofiber® works as a dynamic rheology modifier for plaster systems. It can improve sag resistance and cohesion, helping the material stay in place without slumping during application.
Whether for manual or spray application, it can also reduce material rebound and loss. Moreover, it can help refine the mixture’s internal structure, reducing surface defects for a smooth finish.
Synergy between fiber reinforcement and chemical additives is important for plaster systems, and Celotech can help you optimize this balance for better performance.
For cement-based systems (stucco), Cellulose fiber and PP fibers work together with Celopro® HPMC/MHEC to ensure strong water retention, and Vinabond® RDP can enhance flexibility and long-term adhesion, making your system more resistant to stress and cracking.
For gypsum-based systems, Gypstar® Gypsum Retarder can help you extend open time in fast-setting formulations. It can give the fiber network enough time to fully develop, improving workability and resulting in a smoother, crack-free finish.
In different types of plaster systems, you need to choose the fiber according to the application type and performance requirements. Different fibers play specific roles in improving workability, strength, and crack resistance.
| Plaster Type | Recommended Fiber | Main Benefit |
| Gypsum Plaster | Cellulose Fiber | Crack resistance, workability |
| Machine Plaster | Cellulose Fiber | Pumpability, anti-sagging |
| Cement Plaster | Cellulose Fiber + PP Fiber | Crack control and durability |
| Exterior Stucco | PP Fiber | Tensile reinforcement |
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In gypsum plaster systems, besides fibers, you also need to combine other functional additives to achieve high performance.
| Function | Product |
| Crack Resistance | Cellulose Fiber |
| Water Retention | MHEC |
| Open Time Control | Gypsum Retarder |
| Workability | Pregelatinized Starch |
Fibers alone can not optimize cement plaster too, you can refer to the below formulation.
| Function | Product |
| Crack Resistance | Cellulose Fiber / PP Fiber |
| Water Retention | HPMC / MHEC |
| Adhesion | RDP |
| Setting Acceleration | Calcium Formate |
| Hydrophobicity | Water Repellent Agent |
Both Cellulose Fiber and PP Fiber have water retention. Cellulose Fiber is mainly used for premature water loss. While PP Fiber is more suggested to control plastic shrinkage.
Cellulose Fiber can reduce cracking to a great degree, but cannot fully eliminate it alone. You need to combine other additives and form a full balance and effective formulation.
The dosage is generally low, but for a specific addition level, you need to test and evaluate depending on the system type and performance requirement.
The reasons can be shrinkage stress, poor water retention, improper curing conditions, or imbalance in the formulation system. We can work with you to analyze the roots and provide effective solutions based on your system and application conditions.
Gypsum plaster fiber mainly improves workability, crack resistance, and surface finish in fast-setting systems.
For Cement plaster fiber, it focuses more on shrinkage control, durability, and resistance to mechanical stress in high-strength environments.
If you encounter any specific issues during application, or wish to learn more about how our products can help enhance your putty formulations, please feel free to contact our professional technical team for an in-depth discussion.
Gypsum plaster is widely used as an alternative to traditional cement plaster in modern construction. It is known for being lightweight, thermally efficient, and easy to work with.
This article explores the main benefits of using construction grade HPMC in dry-mix mortars and tile adhesives.
