间苯二甲酸

Name: 间苯二甲酸
Brand: 济南圣和化工有限公司

CAS 121-91-5C8H6O4MW 166.13

间苯二甲酸（CAS 121-91-5）属有机化学品类产品，分子式 C8H6O4，分子量 166.13。济南圣和化工有限公司常年现货供应该产品，常规纯度按批次COA提供(不公开发布)，可按客户需求安排分装包装，欢迎邮件或来电询价。

产品概览

CAS号	121-91-5
分子式	C8H6O4
分子量	166.13
熔点	653 °F (USCG, 1999)
LogP	log Kow = 1.66
纯度	按批次COA提供(不公开发布)
包装	按订单/批次确认(不公开发布)
应用领域	有机化学品
类别	有机化学品

应用领域

有机化学品

该产品的下游应用集中在有机化学品。不同客户工艺差异较大，我们支持按需提供样品与小批量试用。

包装与储存

包装规格按订单/批次确认(不公开发布)

纯度规格按批次COA提供(不公开发布)

储存条件密封、阴凉干燥处保存

运输常规化工运输

样品可协商提供

交期现货/按订单安排

采购提示：本产品按按订单/批次确认(不公开发布)起订发货，收到货物后请先核对包装完好性再行入库。储存条件为阴凉干燥、密封保存；如需 MSDS 或运输说明，可在询价时一并索取。

质量与文件

每批产品随货提供 COA（分析证书）；可按需提供 MSDS/技术数据表及第三方检测报告。纯度与包装以批次 COA 及订单确认为准。

关于供应商

选择济南圣和化工有限公司的理由：产品信息透明（含 CAS、分子式、理化参数）、报价响应快（一个工作日内）、单证齐全（COA/MSS/质检资料按需提供）、支持批量与长期协议供货。如需间苯二甲酸以外的配套原料，也欢迎一并列出需求清单。

常见问题

间苯二甲酸的 CAS 号是多少？

间苯二甲酸的 CAS 号为 121-91-5。

该产品的纯度和包装规格是什么？

常规纯度规格为按批次COA提供(不公开发布)，包装为按订单/批次确认(不公开发布)，随货提供 COA。

间苯二甲酸有什么用途？

主要应用于有机化学品。

如何购买或获取报价？

请发送邮件至 info@591daili.com 或通过 WhatsApp 联系，注明产品名称、CAS 号与需求数量，一个工作日内回复报价。供应商：济南圣和化工有限公司。

PubChem 公开数据

Description

Isophthalic acid · CAS 121-91-5 · C8H6O4. UNII X35216H9FJ. Melting Point: 653 °F (USCG, 1999); Melting Point: 347 °C; Melting Point: 345-348 °C.

Identification

CAS Registry Number	121-91-5
PubChem CID	8496
Molecular formula	C8H6O4
IUPAC name	benzene-1,3-dicarboxylic acid
UNII (FDA)	X35216H9FJ

Computed Descriptors

Molecular Weight	166.13
XLogP3	1.7
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	2
Exact Mass	166.02660867
Monoisotopic Mass	166.02660867
Topological Polar Surface Area	74.6
Heavy Atom Count	12
Formal Charge	0

Physical & Chemical Properties

Melting Point	653 °F (USCG, 1999)
Melting Point	347 °C
Melting Point	345-348 °C
Density	1.53 at 4 °C
Density	1.507 @ 20°C
Vapor Pressure	0.00000002 [mmHg]
Vapor Pressure	VP: 0.009 Pa (0.0675 mm Hg) at 100 °C
Vapor Pressure	0.068 [mm Hg] @100 °C
LogP	log Kow = 1.66
LogP	1.66

Physical description & handling notes

Isophthalic acid is a white solid with a slight unpleasant odor. Sinks in water. (USCG, 1999)
Dry Powder; Other Solid; Large Crystals; CBI; Liquid
Colorless solid; [Hawley] Sublimes without decomposition; [Merck Index] Melting point = 347 deg C; [HSDB] Faintly beige powder; [MSDSonline]
COLOURLESS CRYSTALLINE POWDER.
Crystalline powder
Colorless crystals

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS FDA Inventory of Effective Food Contact Substance (FCS) Noti: FCS Isophthalic acid (CAS Reg. No. 121-91-5) As a monomer in the manufacture of ethylene terephthalate-isophthalate copolymers. As a monomer in the manufacture of ethylene terephthalate-isophthalate copolymers, except for use in contact w
GHS notification summary	91% (614 / 675)

Regulatory & Food Contact

FDA Cumulative Estimated Daily Intake (CEDI): FCS
FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
FDA Inventory of Effective Food Contact Substance (FCS) Noti: FCS
Isophthalic acid (CAS Reg. No. 121-91-5)
As a monomer in the manufacture of ethylene terephthalate-isophthalate copolymers.
As a monomer in the manufacture of ethylene terephthalate-isophthalate copolymers, except for use in contact w

GHS notification summary

91% (614 / 675)

GHS Hazard Classification

GHS notification summary	91% (614 / 675)

This chemical does not meet GHS hazard criteria for 91% (614 of 675) of all reports.

Reported as not meeting GHS hazard criteria by 614 of 675 companies (only 9% companies provided GHS information). For more detailed information, please visit ECHA C&L website.

Documented Uses

Used to make plastics, unsaturated polyester resins, alkyd resins, polyamides, and thermoplastic polyesters; Used as a co-monomer with terephthalic acid to make plastic bottles and specialty resins; [HSDB] Used in formulations for adhesives, inks, wire enamels, and dental materials; [CAMEO]
Working with Glues and Adhesives [Category: Other]
Plastic Composites Manufacturing [Category: Industry]
CHEM INT FOR DIPHENYL ISOPHTHALATE
CHEM INT FOR THE PLASTICIZER, DIOCTYL ISOPHTHALATE, DIMETHYL ISOPHTHALATE & DIETHYL ISOPHTHALATE
CHEM INT FOR DIALLYL ISOPHTHALATE (CROSS LINKING AGENT)

Synonyms

ISOPHTHALIC ACID; 121-91-5; Benzene-1,3-dicarboxylic acid; 1,3-Benzenedicarboxylic acid; m-Phthalic acid; m-Benzenedicarboxylic acid; Acide isophtalique; Kyselina isoftalova; DTXSID3021485; X35216H9FJ; NSC-15310; DTXCID301485; CHEBI:30802; benzene-1,3-dicarboxylate;hydron; RefChem:7642; 204-506-4

Frequently Asked Questions

What are the CAS number and molecular formula of Isophthalic acid?

CAS 121-91-5; molecular formula C8H6O4; molecular weight — g/mol.

What other names is Isophthalic acid known by?

ISOPHTHALIC ACID, 121-91-5, Benzene-1,3-dicarboxylic acid, 1,3-Benzenedicarboxylic acid, m-Phthalic acid, m-Benzenedicarboxylic acid.

What is the regulatory status of Isophthalic acid?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; FDA Inventory of Effective Food Contact Substance (FCS) Noti: FCS.

Is Isophthalic acid classified as hazardous?

91% of GHS notifications report no hazard classification (614 of 675).

What are the key physical properties of Isophthalic acid?

Melting Point: 653 °F (USCG, 1999); Melting Point: 347 °C; Melting Point: 345-348 °C; Density: 1.53 at 4 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.