3,4-Dihydroxybenzoic acid

Methyltin mercaptide

3,4-Dihydroxybenzoic acid paramete

CAS No.: 99-50-3
MF: C7H6O4
Place of Origin: Shandong, China
Purity: 99.9%min
Model Number: CAS 99-50-3
Appearance: White Powder
Molecular weight: 116.16
Packing: 1,25,50,200kg / drum
Boiling point: 95 °C20 mm Hg(lit.)
Flash point: 185 °F
PH: 7-8 (500g/l, H2O, 20℃)
Other Names: 3,4-Dihydroxybenzoic acid
EINECS No.: 219-460-0
Type: Agrochemical Intermediates, Dyestuff Intermediates, Flavor & Fragrance Intermediates, Pharmaceutical Intermediates, Syntheses Material Intermediates
Brand Name: Lookchemical
Application: Pharm Intermediates
Color: white
Vapor density: 0.939 g/mL at 25 °C(lit.)
Melting point: -33 °C
Density: 0.939 g/mL at 25 °C(lit.)
Storage: 2-8°C





White-like Crystalline Powder


≥ 99.5 %

Melting Point


Loss on Drying

≤ 1.0 %


1.Protocatechuic acid can be used as intermediates in dyes and medicine.

2.Used as an intermediate in dyes and medicine and as an analytical reagent (to test iron).

3.Protocatechuic acid can be used to study the effects of 4-coumaric acid and 3, 4-dihydroxybenzoic acid on oxidative DNA damage of colonic mucosal base in rats in vivo. It can be used in the derivatization of chitosan resin

Product service

1. Certificate Of Analysis (COA)

2. Material Safety Data Sheet (MSDS)

3. Route of synthesis (ROS)

4. Method of Aanlysis (MOA)

5. Nuclear Magnetic Resonance (NMR)

6. Packing pictures and loading video before loading

7. Free Sample

8. Factory audit


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.

After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Q1: Do you accept sample order?
A:  We will make samples before mass production, and after sample approved, we'll begin mass production. Doing 100% inspection during production, then do random inspection before packing.
Q2:  What is our advantage?
A : The series of natural extracted product are all self-developed, produced and tested. Mature production technology, strict cost control, and perfect quality assurance system, ensure the product stability and competitive price.
Q3: What’s your MOQ?
A :  Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.
Q4: Do you supply product report?
A : Yes. We'll give you product analysis report before shipping.
 Q5: Is there a discount?
A :  Different quantity has different discount.
Q6: Can we visit your factory?
A :  Yes. Welcome to visit.
Q7: How to confirm the Product Quality before placing orders?
A :  You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.


H315 (81.44%): Causes skin irritation [Warning Skin corrosion/irritation]

H319 (81.44%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]

H335 (80.84%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

H411 (18.56%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]


Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.


25kg/ drum.

Packing can be conducted according to customers' requirements.

Delivery detail

   [Delivery] 5 working days after payment.

3,4-Dihydroxybenzoic acid picture

Packaging and shipping

Honor Certificate

Professional team