RTV2 white silicone rubber for large craft mold making with low shrinkage rate.

RTV2 White Silicone Rubber for Large Craft Molds with Low Shrinkage Rate

In the production of large craft molds, the selection of condensation-type liquid silicone (condensation-type room temperature vulcanized silicone rubber, RTV-2) is based on a comprehensive consideration of its material properties, process adaptability, and cost-effectiveness. The following analysis covers material characteristics, applicable scenarios, advantages and limitations, and key points of the manufacturing process:
1. Core Characteristics of RTV2 White Silicone Rubber
1. Curing Mechanism and Material Composition
Composition: Primarily consists of base gum (hydroxyl-terminated polydimethylsiloxane), crosslinker (such as ethyl silicate), catalyst (tin compounds like stannous octoate), and filler (such as fumed silica).
Curing Method: Crosslinking is achieved through a condensation reaction, releasing small molecule byproducts like ethanol during the curing process. No heating is required; it cures at room temperature.
Typical Parameters: Mixing ratio: base gum: crosslinker: catalyst = 100:2-5:0.5-2
Pot life: 20-60 minutes (affected by temperature; higher temperatures accelerate curing).
Full curing time: 24-48 hours (at room temperature, 25°C).

For inquiries about RTV2 White Silicone Rubber, contact Ms. Chen at 13662816580