• Phthalic Anhydride CAS 85-44-9

Phthalic Anhydride CAS 85-44-9

Phthalic Anhydride is positioned in industrial supply as a key aromatic intermediate used in large-scale chemical manufacturing, especially in the production of phthalate plasticizers, alkyd resins, unsaturated polyester resins, and dye intermediates. It is one of the core building blocks in aromatic acid chemistry due to its high reactivity toward alcohols and glycols.

In commercial supply, it is typically handled as a solid flake or molten-solidified product depending on logistics and storage conditions. It is mainly used as a feedstock for downstream chemical synthesis rather than a direct formulation ingredient. Standard export packaging and bulk supply arrangements are available, with supporting documents such as COA, TDS, and SDS provided for industrial procurement and compliance needs.

  • CAS: 85-44-9
  • Synonyms: 1,2-Benzenedicarboxylic anhydride; PA
  • Einecs: 201-607-5
  • Molecular Formula: C₈H₄O₃
  • Grade: Industrial grade
  • Package: Available in standard export packaging; packaging format arranged according to bulk handling and transportation requirements
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Product Description

Physicochemical Properties

ItemDescription
AppearanceWhite crystalline flakes or solid
OdorStrong, characteristic irritating odor
Melting PointApprox. 131–133°C
Boiling PointApprox. 284°C (decomposition possible)
SolubilityReacts with water (hydrolysis); soluble in hot organic solvents
DensityApprox. 1.5 g/cm³
Vapor PressureLow at ambient temperature
ReactivityHighly reactive cyclic anhydride; hydrolyzes to phthalic acid in presence of moisture

Typical Applications

  • Plasticizer production: Key raw material for phthalate esters used in PVC flexibility modification.
  • Alkyd resins: Used in coating and paint resin synthesis as an aromatic acid component.
  • Unsaturated polyester resins: Contributes to resin backbone structure in composite materials.
  • Dye and pigment intermediates: Used in the synthesis of various aromatic derivatives.

Application suitability should be evaluated based on formulation design and regulatory requirements in the target market.

Packaging

Phthalic Anhydride is supplied as a solid product and packed in moisture-protected, sealed packaging to ensure stability during storage and transport. Common packaging formats include multi-layer bags or lined containers suitable for industrial chemical handling.

Packaging is designed to minimize exposure to moisture due to its reactive nature. Bulk and palletized shipment options can be arranged depending on order volume and logistics needs.

Storage

Store in a cool, dry, and well-ventilated area. Keep containers tightly closed and protected from moisture, as the product readily reacts with water.

Avoid exposure to humid environments and incompatible substances during storage and handling.

FAQ

Can bulk supply be arranged?
Yes, bulk and export-scale supply can be arranged according to order requirements.

What is the main industrial use of Phthalic Anhydride?
It is mainly used as a key intermediate in plasticizer and resin production.

How does Phthalic Anhydride behave in moisture?
It reacts with water to form phthalic acid, so moisture control is critical during storage and handling.

In what form is it supplied?
It is typically supplied as flakes or solidified material suitable for industrial processing.

What industries commonly use this product?
It is widely used in plastics, coatings, resins, and dye manufacturing industries.

Is documentation available for procurement?
COA, TDS, and SDS are available to support technical evaluation and safe handling.

FAQ - Technical & Supply Chain

Documents

Documents and Product Support

For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.

  • COA for batch-based quality reference
  • TDS for key physical and chemical information
  • SDS / MSDS for handling, storage, and safety reference
  • Packing information for sample, trial, and bulk orders
  • Technical communication based on application and specification requirements
Quotation

Information to Confirm Before Quotation

Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.

  • Product name and CAS number
  • Application or intended end use
  • Required purity, grade, or specification
  • Sample quantity, trial order, or bulk demand
  • Preferred packing form or net weight
  • Destination country or port
  • Required documents or compliance expectations
Storage & Handling

Packaging, Storage, and Handling Notes

Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.

Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.

Supply Support

Sample, Bulk Order and Repeat Supply Support

Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.

For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.

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