Modified Starch for Gypsum Boards
KAG-GYP | SEVAGRAM EXCIPIENTS
High-Performance Starch Additive for Stronger, Durable Gypsum & Plaster Boards
KAG-GYP is a specially engineered modified starch for gypsum boards developed by Sevagram Excipients, one of India’s leading manufacturers of specialty and modified starches. Designed for use in gypsum board and plasterboard manufacturing, KAG-GYP plays a critical role as a co-binder within the gypsum core, significantly enhancing core strength, paper-to-core bonding, flexural strength, and nail-pull resistance.
Modern gypsum board production demands consistent quality, high line speeds, lightweight formulations, and superior mechanical performance. Conventional native starches often fail to meet these evolving requirements. KAG-GYP addresses these challenges through controlled chemical modification, optimized gelatinization behavior, and predictable migration characteristics inside the gypsum matrix.
This product is fully aligned with Sevagram Excipients’ broader modified starch and spray starch portfolio for the paper and board industry, ensuring technical synergy, reliable supply, and application expertise across construction and building material segments.
What is Gypsum Board Starch and Why It Matters
In gypsum board manufacturing, a slurry of calcined gypsum, water, and additives is deposited between two paper liners. During setting and drying, the integrity of the final board depends on:
Strength of the gypsum crystal network
Adhesion between the gypsum core and paper liners
Resistance to mechanical stress such as bending, fastening, and handling
Modified starch for gypsum boards acts as a functional binder that reinforces the gypsum crystal structure and strengthens the interface between the core and the facing paper. Without a properly designed starch, boards may suffer from weak bonding, edge cracking, low nail-holding capacity, and inconsistent performance.
KAG-GYP has been specifically developed to perform reliably under high-temperature kiln conditions, ensuring optimal starch gelatinization and controlled migration toward the paper-core interface.
Product Description: KAG-GYP
KAG-GYP is a high-purity, maize-based modified starch powder formulated for direct addition into gypsum slurry systems. When subjected to oven temperatures during board drying, the starch gelatinizes and migrates uniformly, forming strong adhesive bridges between gypsum crystals and cellulose fibers of the paper liner.
This behaviour results in a dense, well-bonded core with improved mechanical integrity and surface stability.
Key Features and Performance Benefits
- Optimized starch modification for gypsum and plasterboard applications
- Available in a wide viscosity range to suit different board formulations and operating temperatures
- Controlled gelatinization for consistent in-kiln performance
- Efficient migration toward the paper-core interface
- Uniform bonding across board width and edges
- Compatible with standard gypsum board manufacturing processes
- Suitable for lightweight gypsum boards and high-speed production lines
Improved Core Strength
KAG-GYP reinforces the internal gypsum crystal matrix, resulting in higher compressive and cohesive strength of the board core.
Superior Paper-to-Core Bonding
The modified starch enhances adhesion between gypsum crystals and paper fibers, reducing paper delamination during cutting, handling, and installation.
Enhanced Flexural Strength
Boards produced with KAG-GYP show improved resistance to bending stresses, reducing breakage during transportation and on-site handling.
Higher Nail-Pull Resistance
Strong internal bonding and surface integrity significantly improve fastener holding capacity, a critical requirement for drywall installation.
Uniform Edge and Surface Strength
Controlled starch migration ensures consistent bonding at board edges, minimizing edge crumbling and improving overall board quality.
Application in Gypsum & Plaster Board Manufacturing
KAG-GYP is added directly to the gypsum slurry during board formation. As the board passes through the drying oven:
- The starch gelatinizes under controlled heat
- Modified starch molecules migrate toward the paper-core interface
- Adhesive bonding develops between gypsum crystals and paper fibers
- Final boards achieve uniform strength, bonding, and mechanical stability
The dosage can be optimized based on board thickness, density, paper type, and desired performance characteristics.
Technical Advantages Over Native Starch
Compared to conventional native starches, KAG-GYP offers:
- Better thermal stability during kiln drying
- Predictable viscosity behaviour
- Improved bonding efficiency at lower dosages
- Reduced variability in board performance
- Compatibility with modern lightweight board formulations
These advantages translate into process consistency, cost efficiency, and improved finished product quality.
Alignment with Sevagram Excipients’ Product Portfolio
Sevagram Excipients is widely recognized for its modified starch solutions for paper, board, and industrial applications, including:
- Spray starches for kraft paper and duplex board
- Oxidized starches for surface sizing and coating
- Cationic starches for wet-end applications
- Dextrins and specialty binders
KAG-GYP extends this expertise into the gypsum and building materials sector, leveraging the same core strengths in starch chemistry, process understanding, and customer-specific customization.
For manufacturers already using Sevagram’s spray starch or paper board starch products, KAG-GYP offers a natural extension of technical partnership and supply reliability.
Packaging and Storage
Packaging Options
- 25 kg bags
- 50 kg bags
- Jumbo bags
Packaging Materials
- HDPE woven bags
- Paper bags with inner liner
Storage Guidelines
- Store in a clean, dry, and dust-free warehouse
- Keep away from moisture and direct water contact
- Stack on pallets above ground level
OUR OTHER PRODUCTS
Sevagram Excipients – Your Partner in Modified Starches
- Decades of expertise in modified starch manufacturing
- Consistent product quality and performance
- Technical support for dosage optimization and process integration
- Scalable production capacity for domestic and export markets
- Integrated portfolio serving paper, board, textile, and construction industries
KAG-GYP – Modified Starch for Gypsum Boards is a reliable, high-performance solution engineered to meet the demanding requirements of modern gypsum board manufacturing. By improving core strength, paper-to-core bonding, flexural strength, and nail-pull resistance, KAG-GYP helps manufacturers achieve consistent quality, improved durability, and enhanced end-user satisfaction.
Backed by Sevagram Excipients’ strong foundation in specialty starch technology for paper and board applications, KAG-GYP delivers proven performance, process efficiency, and long-term value for gypsum board producers.