What is Naphthalene Acetic Acid CAS 86-87-3?

Naphthalene Acetic Acid CAS 86-87-3, also called NAA or 1-naphthaleneacetic acid, is a synthetic auxin plant growth regulator. It is supplied as a white to off-white crystalline powder and is used mainly for rooting, fruit retention and fruit thinning.

How does NAA work in plants?

NAA enters plants through leaves, tender stems or seeds and moves to active growing sites. It stimulates cell division, cell elongation and tissue differentiation, acting like the natural auxin indole acetic acid but with greater stability.

What are the main agricultural uses of NAA?

It promotes adventitious root formation in cuttings, prevents pre-harvest fruit drop, thins excess fruit in apples and pears, and induces uniform flowering in pineapple. It is also used to improve fruit set and grain fill in vegetables and cereals.

How is the 98% technical grade dissolved before field application?

The pure acid form is not directly soluble in cold water. Dissolve it first in a small amount of ethanol, acetone or dilute alkaline solution, then dilute that concentrate with water to the required spray concentration.

Why is NAA often combined with indole-3-butyric acid?

NAA and indole-3-butyric acid have complementary rooting effects. Combining them can improve rooting rate and root quality, especially for difficult-to-root woody and herbaceous cuttings.

What concentration effect should be considered with NAA?

NAA is highly active at low use rates. Lower concentrations promote rooting and fruit retention, while higher concentrations inhibit growth and are used for fruit thinning, so overdosing may cause phytotoxicity.

Naphthalene Acetic Acid CAS 86-87-3

Naphthalene Acetic Acid (CAS 86-87-3) is a synthetic plant hormone belonging to the auxin family, functioning as a potent regulator for root induction and fruit setting in agricultural crops. Chemically designated as 1-Naphthaleneacetic acid or NAA, this white crystalline powder acts to stimulate cell elongation and prevent pre-harvest fruit drop in horticultural management. As a vital Alpha-naphthylacetic acid active ingredient, it is widely formulated into rooting powders and soluble concentrates to enhance vegetative propagation and yield stability. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific purity levels. Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

CAS: 86-87-3
Synonyms: 1-Naphthaleneacetic acid, Alpha-naphthylacetic acid, NAA, 1-Naphthylacetic acid
Einecs: 201-705-8
Molecular Formula: C₁₂H₁₀O₂
Grade: Technical Grade (98% TC)
Package: 1kg Aluminum Foil Bag / 25kg Fiber Drum

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Product Description

Naphthalene Acetic Acid (NAA) is a white, crystalline powder that acts similarly to the naturally occurring auxin, Indole Acetic Acid (IAA), but with greater stability and effectiveness.

Key Characteristics:

Mechanism: It enters the plant through leaves, tender skin, and seeds. It is transported to active growing sites where it stimulates cell division and tissue differentiation.
Solubility Note: The pure acid form (CAS 86-87-3) is not directly soluble in cold water. It must be dissolved in a small amount of alcohol, acetone, or alkaline solution (like Sodium Hydroxide) before being diluted with water for application.
Synergy: It is often formulated with Indole-3-Butyric Acid (IBA) to create powerful rooting compounds for difficult-to-root plant species.

1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

The following specifications are based on the standard 98% Technical Concentrate (TC) export grade.

Parameter	Specification
Appearance	White to off-white crystalline powder
Assay (Purity)	≥ 98.0%
Melting Point	129.0°C – 132.0°C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Water Solubility	Insoluble in cold water
Solvent Solubility	Soluble in Ethanol, Acetone, Ether, Chloroform
Free Acid	≤ 0.2%

Applications

Rooting Promotion:
- Applied to the base of cuttings (dipping or soaking) to induce rapid root formation in tea, grapes, roses, and timber trees.
Fruit Thinning & Anti-Drop:
- Apples & Pears: Used for thinning excess fruit early in the season to improve fruit size.
- Pre-Harvest: Sprayed weeks before harvest to prevent premature fruit drop, significantly increasing marketable yield.
Flowering Control:
- Used in pineapples to induce uniform flowering, allowing for synchronized harvest.
Yield Enhancement:
- Prevents hollow seeds in vegetables and increases the weight of grains in crops like wheat and rice.

For related plant-growth-regulator raw materials, subject to applicable crop-use registrations, see Gibberellic Acid and 2-Naphthoxyacetic Acid.

Storage Conditions

Environment: Store in a cool, dry, and well-ventilated warehouse.
Light: Sensitive to light. Store in light-resistant (opaque) containers.
Temperature: Keep separate from fire and heat sources. Recommended storage temperature is below 30°C.
Isolation: Do not store or transport with food, beverages, grains, or animal feed.

Safety Precautions

Handling: NAA is an organic acid and can cause irritation. Avoid direct contact with skin and eyes.
Inhalation: Do not breathe dust. Use local exhaust ventilation.
PPE: Wear protective gloves, safety goggles, and a dust mask (N95 or equivalent) during handling.
First Aid:
- Eyes: Rinse immediately with plenty of water for at least 15 minutes.
- Skin: Wash off with soap and water.
Toxicity: Low toxicity to humans but highly active on plants. Follow dosage instructions carefully to avoid phytotoxicity (burning of crops).

FAQ - Technical & Supply Chain

Q:
What is Naphthalene Acetic Acid CAS 86-87-3?

A: Naphthalene Acetic Acid CAS 86-87-3, also called NAA or 1-naphthaleneacetic acid, is a synthetic auxin plant growth regulator. It is supplied as a white to off-white crystalline powder and is used mainly for rooting, fruit retention and fruit thinning.
Q:
How does NAA work in plants?

A: NAA enters plants through leaves, tender stems or seeds and moves to active growing sites. It stimulates cell division, cell elongation and tissue differentiation, acting like the natural auxin indole acetic acid but with greater stability.
Q:
What are the main agricultural uses of NAA?

A: It promotes adventitious root formation in cuttings, prevents pre-harvest fruit drop, thins excess fruit in apples and pears, and induces uniform flowering in pineapple. It is also used to improve fruit set and grain fill in vegetables and cereals.
Q:
How is the 98% technical grade dissolved before field application?

A: The pure acid form is not directly soluble in cold water. Dissolve it first in a small amount of ethanol, acetone or dilute alkaline solution, then dilute that concentrate with water to the required spray concentration.
Q:
Why is NAA often combined with indole-3-butyric acid?

A: NAA and indole-3-butyric acid have complementary rooting effects. Combining them can improve rooting rate and root quality, especially for difficult-to-root woody and herbaceous cuttings.
Q:
What concentration effect should be considered with NAA?

A: NAA is highly active at low use rates. Lower concentrations promote rooting and fruit retention, while higher concentrations inhibit growth and are used for fruit thinning, so overdosing may cause phytotoxicity.

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