What is Benzophenone-3 CAS 131-57-7?

Benzophenone-3 is a benzophenone-type ultraviolet absorber also known as Oxybenzone, 2-Hydroxy-4-methoxybenzophenone, BP-3, or UV-9. Its CAS number is 131-57-7, EINECS 205-031-5, and molecular formula C14H12O3.

How does Benzophenone-3 protect plastics and coatings?

It absorbs ultraviolet radiation, commonly in the broad UV range around 290-400 nm, and dissipates the energy harmlessly. This helps reduce UV-induced yellowing, chain scission, and mechanical degradation in polymer and coating systems.

Which polymers and resins are compatible with Benzophenone-3?

It is commonly used in PVC, polystyrene, polyurethane, acrylic resins, unsaturated polyester, and related industrial coatings or clear finishes. Compatibility depends on the specific resin system and processing conditions.

What is the typical dosage of Benzophenone-3 in polymer applications?

Technical sources often recommend about 0.1-0.5% for thin articles and 0.05-0.2% for thicker parts, while some systems use up to about 1.5%. The optimum loading should be evaluated with the target resin and end-use exposure.

What are the key physical properties of Benzophenone-3?

It is a white to light yellow crystalline powder with a melting point around 62-65 deg C. It is essentially insoluble in water but readily soluble in ethanol, acetone, and common organic solvents.

Is this industrial-grade Benzophenone-3 automatically suitable for food-contact use?

No. Food-contact suitability depends on the specific polymer system, migration limits, and local regulatory requirements. The grade and end-use compliance should be confirmed separately for each intended application.

Benzophenone-3 (BP-3) CAS 131-57-7

Benzophenone-3, commonly abbreviated BP-3 and also known as oxybenzone, CAS 131-57-7, is an organic aromatic ketone supplied as an oil-soluble UV absorber and light stabilizer. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 131-57-7
Synonyms: Oxybenzone; 2-Hydroxy-4-methoxybenzophenone; UV-9
Einecs: 205-031-5
Molecular Formula: C14H12O3
Grade: Industrial / polymer additive grade
Package: Standard fiber drums or customized moisture-proof bulk packaging

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Product Description

Benzophenone-3 (BP-3) CAS 131-57-7 is a benzophenone-type ultraviolet absorber, with EC 205-031-5 and molecular formula C14H12O3.

Synonyms: Oxybenzone; 2-Hydroxy-4-methoxybenzophenone; UV-9.

CAS: 131-57-7.

Molecular formula: C14H12O3.

It is supplied as a white to light yellow crystalline powder.

It has a melting point around 62-65 C and is essentially insoluble in water but soluble in ethanol, acetone, and common organic solvents.

It is positioned as an oil-soluble UV absorber and light stabilizer.

It absorbs ultraviolet radiation, commonly in the broad UV range around 290-400 nm.

It helps reduce UV-induced yellowing, chain scission, and mechanical degradation in polymer and coating systems.

It is used in PVC, polystyrene, polyurethane, acrylic resins, unsaturated polyester, and related industrial coatings.

Technical sources often recommend about 0.1-0.5% for thin articles and 0.05-0.2% for thicker parts.

Food-contact suitability depends on the polymer system, migration limits, and local regulatory requirements.

Confirm purity, appearance, melting range, and related specifications for the chosen grade.

Store in tightly closed, moisture-proof containers in a cool, dry, well-ventilated area, away from direct sunlight and strong oxidizing agents.

Use suitable PPE when handling the powder to prevent dust exposure and skin or eye contact.

Confirm packaging suitable for the solid form and order quantity, and follow the current SDS.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Benzophenone-3 CAS 131-57-7?

A: Benzophenone-3 is a benzophenone-type ultraviolet absorber also known as Oxybenzone, 2-Hydroxy-4-methoxybenzophenone, BP-3, or UV-9. Its CAS number is 131-57-7, EINECS 205-031-5, and molecular formula C14H12O3.
Q:
How does Benzophenone-3 protect plastics and coatings?

A: It absorbs ultraviolet radiation, commonly in the broad UV range around 290-400 nm, and dissipates the energy harmlessly. This helps reduce UV-induced yellowing, chain scission, and mechanical degradation in polymer and coating systems.
Q:
Which polymers and resins are compatible with Benzophenone-3?

A: It is commonly used in PVC, polystyrene, polyurethane, acrylic resins, unsaturated polyester, and related industrial coatings or clear finishes. Compatibility depends on the specific resin system and processing conditions.
Q:
What is the typical dosage of Benzophenone-3 in polymer applications?

A: Technical sources often recommend about 0.1-0.5% for thin articles and 0.05-0.2% for thicker parts, while some systems use up to about 1.5%. The optimum loading should be evaluated with the target resin and end-use exposure.
Q:
What are the key physical properties of Benzophenone-3?

A: It is a white to light yellow crystalline powder with a melting point around 62-65 deg C. It is essentially insoluble in water but readily soluble in ethanol, acetone, and common organic solvents.
Q:
Is this industrial-grade Benzophenone-3 automatically suitable for food-contact use?

A: No. Food-contact suitability depends on the specific polymer system, migration limits, and local regulatory requirements. The grade and end-use compliance should be confirmed separately for each intended application.

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