Description

Eclipse (Shrink Reducing Agent) is a specialized chemical additive designed to control and minimize shrinkage in polymer and composite materials. Its core value lies in enhancing dimensional stability and reducing internal stresses during the curing and cooling phases of manufacturing. This product is essential for industries where precise tolerances and material integrity are critical, such as advanced composites, high-performance coatings, and engineered plastics.

Application

• As a shrinkage control agent in unsaturated polyester resins (UPR) and vinyl ester resins for fiber-reinforced plastics (FRP).
• To improve surface finish and reduce micro-cracking in gel coats and topcoats for marine and automotive applications.
• Enhancing the dimensional accuracy and reducing warpage in pultruded and sheet molding compound (SMC) components.
• Modifying epoxy resin systems for electronic encapsulation and potting compounds to minimize stress on delicate components.
• Used in the formulation of low-profile additives (LPA) for automotive body panels and industrial parts.
• Application in acrylic-based casting resins and adhesives to ensure consistent volume and bond strength.

Basic Information

Product Name	Eclipse (Shrink Reducing Agent)
CAS No.	54264-01-6
Molecular Formula	C9H14O3
Molecular Weight	170.21 g/mol
Synonyms	Poly(vinyl acetate); 2-Propenoic acid, 2-methyl-, methyl ester, polymer with ethenyl acetate; Vinyl acetate-acrylate copolymer; VAc-MMA copolymer; Acrylic modifier; Low-profile additive; Shrinkage control polymer; Methyl methacrylate-vinyl acetate copolymer
EINECS	Contact for details

Quality Control

Our Eclipse (Shrink Reducing Agent) is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance, including assessment of molecular weight distribution, monomer content, and compatibility. Certificates of Analysis (COA) detailing purity and key physical-chemical parameters are available upon request to support your quality assurance protocols.

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). Keep away from heat sources and open flame. Under recommended storage conditions, the product is stable for 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to standard
Assay (Solid Content)	Min. 98.0 %
Viscosity (25°C)	2000 - 5000 mPa·s
Acid Value	≤ 1.0 mg KOH/g
Volatile Content	≤ 2.0 %

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