High purity, low color.
Purity ≥99.5% with molten color ≤20 APHA, suited to light-colored plasticizers and resins.
Phthalic Anhydride (Pennsylvanie)
Phthalic Anhydride (Pennsylvanie) Supplier — Plasticizer and Resin Raw Material
Phthalic anhydride (Pennsylvanie, CAS 85-44-9) is one of the most widely used organic intermediates. It is the starting material for phthalate plasticizers such as DBP, DIBP and DOP, and a core acid component of unsaturated polyester and alkyd resins. SUNCHEM supplies PA with purity ≥99.5% and a COA for every batch.
CAS 85-44-9 · C₈H₄O₃ · 1,3-Isobenzofurandione
- Lot de COA avec chaque expédition
- Des échantillons pour vos essais
- Support technique pour votre essai
Présentation du produit & avantages clés
Phthalic anhydride is the cyclic anhydride of phthalic acid. The anhydride ring opens readily with alcohols, which is why PA is the standard route to phthalate esters and to the polyester backbone of many resins.
Most PA goes into plasticizers for PVC, such as dibutyl phthalate (DBP), diisobutyl phthalate (DIBP) and dioctyl phthalate (DOP). The second large outlet is resins: in unsaturated polyester resin (UPR) PA is the saturated acid used alongside maleic anhydride, and in alkyd resins for paints and coatings it supplies the aromatic acid component.
PA is also an intermediate for dyes and pigments, the laxative phenolphthalein, saccharin sodium, and agrochemicals including the insecticide phosmet, the fungicide folpet and the herbicide bentazone. A high-purity grade is used as an analytical reagent.
For resin and plasticizer makers, pureté, Couleur (molten, heat-stability and sulfuric-acid color) and free phthalic acid are the numbers that decide product color and reactivity.
Batch COA on every shipment.
Pureté, three color tests, crystallization point and free acid are reported for each lot.
Resin raw materials from one supplier.
Phthalic anhydride and maleic anhydride can be quoted together for UPR and alkyd production.
Spécifications techniques
| Paramètre | Spécification | Typical batch result |
|---|---|---|
| Nom du produit | Phthalic Anhydride (Pennsylvanie) | — |
| Numéro CAS. | 85-44-9 | — |
| Numéro CE. | 201-607-5 | — |
| Formule moléculaire | C₈H₄O₃ | — |
| Poids moléculaire | 148.12 | — |
| Apparence | White flake or crystalline powder | White flake or crystalline powder |
| Pureté, % | ≥ 99.5 | 99.96 |
| Molten color, APHA | ≤ 20 | 20 |
| Heat-stability color, APHA | ≤ 50 | 40 |
| Sulfuric-acid color, APHA | ≤ 40 | 10 |
| Crystallization point, °C | ≥ 130.5 | 131.2 |
| Free acid (as phthalic acid), % | ≤ 0.20 | 0.06 |
Typical batch result is from one production lot (batch 20260709) and is shown for reference only. Each shipment is supplied with the COA of the batch you receive.
Applications par industrie
Where phthalic anhydride is used, et que confirmer avant de changer d'approvisionnement.
Phthalate plasticizers for PVC
The largest use. PA is esterified with alcohols to make DBP, DIBP, DOP and other phthalate plasticizers for flexible PVC.
Vérifiez avant l'essai
- Target ester and alcohol
- Color limits for the finished plasticizer
- Monthly volume and delivery form
Unsaturated polyester resins
Used with maleic anhydride and glycols in ortho-phthalic UPR for FRP, gelcoats, artificial stone and putties. PA is the saturated acid that balances stiffness and cost.
Vérifiez avant l'essai
- Resin type and color target
- Purity and free-acid limits
- Pennsylvanie / MA ratio in your recipe
Alkyd resins, peintures & revêtements
Supplies the aromatic acid component of alkyd resins for paints, enamels and other coatings.
Vérifiez avant l'essai
- Resin or paint type
- Color and heat-stability color
- Bag size that suits your charging
Colorants, pharmaceutique & intermédiaires agrochimiques
An intermediate for dyes and pigments, phenolphthalein, saccharin sodium, and agrochemicals such as phosmet, folpet and bentazone. A high-purity grade is used as an analytical reagent.
Vérifiez avant l'essai
- Synthesis route and impurity limits
- Documente les besoins de votre équipe d'assurance qualité
- Volume annuel
Sélection & comparaison
Choosing the right PA supply
| Votre exigence | Ce qui fonctionne habituellement |
|---|---|
| General plasticizer and resin production | Industrial PA, purity ≥ 99.5% |
| Light-colored plasticizers, gelcoats and clear resins | Specify molten, heat-stability and sulfuric-acid color limits |
| Ortho-phthalic UPR | PA together with maleic anhydride — both can be quoted on one order |
| Remplacer un fournisseur existant | Envoyez votre TDS ou COA actuel; nous citons en fonction des paramètres que vous approuvez |
Phthalic anhydride vs maleic anhydride
Faites glisser ou faites défiler horizontalement pour voir toutes les colonnes →
| Phthalic Anhydride (Pennsylvanie) | Anhydride maléique (MA) | |
|---|---|---|
| Numéro CAS. | 85-44-9 | 108-31-6 |
| Structure | Aromatic anhydride, no C=C double bond | Unsaturated anhydride with a C=C double bond |
| Role in UPR | Saturated acid — stiffness, cost balance | Unsaturated acid — sites for styrene crosslinking |
| Other main uses | Phthalate plasticizers, alkyd resins, colorants | Alkyds, colophane maléique, SMA copolymers, malathion |
In ortho-phthalic UPR the two are used together; the PA / MA ratio sets the balance between cost and cured hardness. Confirm your recipe by trial.
Emballage & stockage
Emballage
Packaging is confirmed in the quotation. Tell us your bag size and pallet requirements with your inquiry.
Stockage
Keep bags closed in a cool, sec, ventilated store away from heat. Moisture slowly converts PA to phthalic acid. The dust can sensitize skin and airways and damage eyes — follow the SDS.
Transport & termes
Regulated for transport as a corrosive (ET 2214, Classe 8, GE III). Nous citons FOB et CIF; for large volumes, le délai est confirmé dans le devis.
Du premier e-mail à la fourniture approuvée
Name the end product.
Plasticizer, UPR, alkyd or an intermediate: tell us which one, because color and free-acid limits differ.
Comparez les chiffres qui comptent.
Pureté, molten color, heat-stability color, sulfuric-acid color, crystallization point and free acid. Ask for the same parameters on our COA that appear on your incoming-inspection sheet.
Keep the TDS and COA separate.
The specification sets the limits. A COA reports results for one batch only. Ask for the COA of the batch you will receive.
Procès, puis verrouillez la spécification.
Analysez un échantillon dans votre propre processus et conservez le COA du lot approuvé comme référence pour les limites du contrat..
Dites-nous votre besoin. Nous correspondons à la note.
Tell us the product you make, la quantité et le port de destination. Ajoutez vos spécifications actuelles et nous établirons un devis en fonction de celles-ci.
| Information | Exemple |
|---|---|
| Application | Plasticizer (DBP, DOP), UPR, alkyd, dye or intermediate |
| Spécification requise | Pureté, color limits, free acid |
| Formulaire & conditionnement | Flakes; bag size and pallet requirements |
| Quantité | Commande à l'essai / mensuel / volume annuel |
| Destination | Pays et port |
| Documents nécessaires | COA, FDS, DT, other documents your quality team needs |
Produits associés
Anhydride tétrabromophtalique
Brominated derivative of phthalic anhydride for flame-retardant resins.
Voir le produit →Acide Phthalique (Qualité électronique)
High-purity phthalic acid for electronic applications.
Voir le produit →Phthalic Anhydride (Pennsylvanie) FAQ
What is phthalic anhydride used for?
Mainly for phthalate plasticizers such as DBP, DIBP and DOP used in PVC. It is also a core raw material for unsaturated polyester and alkyd resins, peintures et revêtements, and an intermediate for dyes and pigments, phenolphthalein, saccharin sodium and agrochemicals such as phosmet, folpet and bentazone.
What is the CAS number of phthalic anhydride?
Le numéro CAS est 85-44-9. The molecular formula is C₈H₄O₃ and the molecular weight is 148.12.
What purity do you supply?
Purity ≥ 99.5%, with molten color ≤ 20 APHA and free acid ≤ 0.20%. A recent batch tested 99.96% pureté. Every shipment comes with the COA of that batch.
How should phthalic anhydride be stored?
In closed bags in a cool, sec, ventilated store. Moisture slowly converts it to phthalic acid, and the dust can sensitize skin and airways, so follow the SDS for handling.
Is phthalic anhydride dangerous goods?
Oui. It is regulated as a corrosive for transport under UN 2214, Classe 8, GE III.
Puis-je obtenir un échantillon avant de commander?
Oui. Des échantillons gratuits sont disponibles pour les acheteurs évaluant le produit pour une utilisation en production. Les frais de port sont à convenir au cas par cas, et chaque échantillon est livré avec un COA.
