Chestnut Tannin, Chestnut Extract, Chestnut Bitter Tannin, Chestnut Sweet Tannin, 84695-99-8

CHESTNUT TANNIN (CHESTNUT SWEET AND CHESTNUT BITTER)

Chestnut Tannin / Chestnut Extract / Vegetable Tannin / Tannic Acid Derivative
CAS Number: 84695-99-8

1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

Chestnut tannin is a natural polyphenolic compound obtained by extraction from the wood and bark of the chestnut tree (Castanea sativa). It belongs to the class of hydrolyzable tannins and has a high molecular weight polymeric structure. It is a versatile natural product widely used in the leather tanning, textile, adhesive, and food industries. It is available in two different forms: Chestnut Bitter, which has a higher tannin content, and Chestnut Sweet, which has a lower tannin content and milder properties.

2. SYNONYMS AND IDENTIFIERS

3. CHEMICAL STRUCTURE

3.1. General Structural Representation

Chestnut tannin belongs to the class of hydrolyzable tannins and is primarily composed of polymeric structures of gallic acid and ellagic acid derivatives. The main backbone consists of galloyl groups ester-bonded to a glucose (sugar) core.

Representative Monomer Structure (Gallic Acid):

        COOH
         |
         C
        / \
       /   \
      /     \
     C       C
    / \     / \
   /   \   /   \
  /     \ /     \
 OH      C       OH
         | \
         |  \
         |   \
         C    H
        / \
       /   \
      OH    OH

Representative Dimer Structure (Gallotannin - Simplified):

        CH2OH
          |
         CHOH
          |
         CHOH
          |
         CHOH
          |
         CHOH
          |
         CH2O - C(=O) - C6H2(OH)3
                   |
                   C(=O) - C6H2(OH)3
                   |
                   C(=O) - C6H2(OH)3

3.2. Simplified Structural Formula

Representative Formula: Variable (polymeric structure)
Basic Unit: Galloyl groups (C6H2(OH)3-CO-)
Core: Glucose (C6H12O6) or other polyol cores

3.3. Key Structural Features

4. PHYSICAL AND CHEMICAL PROPERTIES

5. SOLUBILITY PROFILE

6. FUNCTIONAL GROUP ANALYSIS

7. PRODUCTION AND MANUFACTURING PROCESS

Chestnut tannin is produced by extraction from the wood and bark of the chestnut tree.

7.1. Raw Materials

7.2. Production Stages

7.3. Differences Between Bitter and Sweet Forms

8. MECHANISM OF ACTION (LEATHER TANNING)

9. APPLICATIONS AND INDUSTRIAL USES

Chestnut tannin is used as a natural, renewable, and versatile product in many industries.

9.1. Leather Tanning Industry (Most Important Application)

9.2. Textile Industry

9.3. Adhesive and Resin Production

9.4. Wine and Food Industry

9.5. Other Applications

10. PRECURSORS AND RAW MATERIALS (UPSTREAM)

11. DERIVATIVES AND DOWNSTREAM PRODUCTS

12. ENVIRONMENTAL AND ECOLOGICAL INFORMATION

13. SAFETY AND TOXICOLOGICAL INFORMATION

14. FIRST AID MEASURES

15. FIRE-FIGHTING MEASURES

16. ACCIDENTAL RELEASE MEASURES

17. STORAGE AND HANDLING

Handling Notes:

• Use closed systems to prevent dust formation.

• Avoid contact with skin, eyes, and respiratory tract.

• Protect from moisture by resealing packaging tightly after use.

• In leather tanning applications, dosage should be adjusted according to leather type and desired properties.

18. TRANSPORT INFORMATION

Chestnut tannin is not classified as a dangerous good for international transport and can be safely shipped by road, sea, and air.

19. REGULATORY INFORMATION

20. KEY ADVANTAGES AND BENEFITS

21. CHESTNUT BITTER VS. CHESTNUT SWEET COMPARISON

22. SUMMARY

Chestnut Tannin (CAS: 84695-99-8) is a natural polyphenolic compound obtained from the chestnut tree (Castanea sativa). It belongs to the class of hydrolyzable tannins and is a brown powder that is soluble in water. Its basic chemical structure consists of a polymeric structure of gallic acid and ellagic acid derivatives ester-bonded to a glucose core. Its high phenolic hydroxyl content provides antioxidant, protein-binding, and metal-chelating properties.

It is available in two different forms: Chestnut Bitter (Kpn) with high tannin content (65-75%) is preferred for leather tanning and high-strength applications. Chestnut Sweet (Kps) with lower tannin content (40-55%) is used in textiles, adhesives, resin production, and food additives.

Main application areas include leather tanning and retanning, textile auxiliary chemicals, adhesive and resin production, and use as a natural additive in the wine and food industry. It also finds applications in ink production, cosmetics, water treatment, and corrosion inhibition.

As a natural, renewable, non-toxic, and biodegradable product, it offers a sustainable and environmentally friendly alternative to synthetic chemicals.

23. KEY PROPERTIES (SUMMARY TABLE)

24. MAIN APPLICATION AREAS

25. CRITICAL NOTICES

1. Natural and Renewable: Chestnut tannin is a natural product obtained from chestnut trees under sustainable forest management. It offers an environmentally friendly alternative to synthetic chemicals.

2. Two Different Forms: Available as Chestnut Bitter (Kpn) and Chestnut Sweet (Kps). The bitter form with high tannin content is preferred for leather tanning, while the sweet form with lower tannin content is used in textile and food applications.

3. Leather Tanning Use: Used as the primary tanning agent in vegetable tanning processes. It stabilizes leather by forming hydrogen bonds and hydrophobic interactions with collagen fibers.

4. Food Applications: Used as a clarifying agent, antioxidant, and color stabilizer in wine and fruit juices. Approved as a food additive by FDA and EFSA.

5. Hygroscopic Nature: Moderately hygroscopic. Must be stored in dry conditions to prevent moisture absorption, caking, and lump formation.

6. Color Imparting: Chestnut tannin imparts natural, warm brown tones to leather and textile products. Dosage must be carefully adjusted in applications where light colors are desired.

7. Dosage Sensitivity: Overdosing in leather tanning and food applications may cause undesirable effects. Optimized trials are recommended prior to use.

8. Regulatory Compliance: Users are responsible for ensuring compliance with all applicable local, national, and international regulations, including food, feed, and industrial applications.

Important Disclaimer: This Technical Data Sheet (TDS) is for informational purposes only. The information provided is based on available data and is believed to be accurate. However, the user is solely responsible for determining the suitability of the product for their specific applications and for complying with all applicable regulations and safety requirements. For complete safety, handling, storage, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Users are obligated to test the product in their own processes and applications. All local, national, and international occupational health and safety regulations must be followed when working with chestnut tannin.