Description

Pre-S (120-145) CAS NO 104753-45-9 is a high-purity, specialized chemical intermediate designed for advanced synthesis and formulation processes. This compound is valued for its consistent molecular weight distribution and reliable performance in demanding applications. It is primarily utilized by manufacturers in the pharmaceutical, agrochemical, and specialty polymer industries seeking precise and scalable raw materials.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs) and novel drug candidates.
• Agrochemical Synthesis: Used in the production of advanced crop protection agents and plant growth regulators.
• Polymer & Resin Modification: Serves as a functional monomer or cross-linking agent for enhancing the properties of specialty polymers and coatings.
• Fine Chemical Production: Essential precursor in multi-step organic synthesis for high-value fine chemicals and flavors/fragrances.
• Research & Development: Critical reagent in laboratory-scale R&D for exploring new chemical entities and process optimization.
• Electronic Chemicals: Potential use in the formulation of specialty chemicals for the electronics industry.

Basic Information

Product Name	Pre-S (120-145)
CAS No.	104753-45-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Pre-S (120-145); Poly(oxy-1,2-ethanediyl), α-hydro-ω-hydroxy-; PEG (120-145); Polyethylene glycol (120-145); α-Hydro-ω-hydroxypoly(oxyethylene); Poly(ethylene oxide) (120-145); Polyoxyethylene (120-145); POE (120-145)
EINECS	Contact for details

Quality Control

Our Pre-S (120-145) is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for identity, purity, and molecular weight distribution. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption.

Specification

Item	Specification
Appearance	White to off-white solid/wax
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Average Molecular Weight	120 - 145 (g/mol)
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.