Mold Silicone - Medium (30 Shore A) 1 kg

EUR 38,69

Mold Silicone - Medium (30 Shore A) is a professional-grade molding silicone typically used for producing casting molds. This all-purpose silicone is dimensionally stable yet slightly flexible, making it ideal for a wide range of mold-making applications. It is easy to wok with, releases cleanly, and is no-toxic. The silicone is white but can be tinted using our silicone colors or our natural pigments. PRO pigments are not compatible with silicone.

This is a tin-cure (condensation) silicone.

The silicone must be mixed with the included curing agent. 1 kg of silicone equals approximately 0.8 L. For smaller batch mixing we recommend using a syringe for accurate measurement of the curing agent - however, precision can be difficult. For easier micing, we recommended our Heat-Resistant Silicone, which has a 1:1 mixing ratio.
Note: Adding more than 3% curing agent will reduce curing time, while using less will extend it.

Always wear gloves when working with silicone, as it is sticky and difficult to remove.

Storage & Shelf Life:

Shelf life: 12 months
Storage temperature: 5-10°C
Can be stored at higher temperatures but not above 25°C

Important:

This silicone has no EU food safety certification, but our Heat-Resistant Silicone is FDA food-safe approved in the U.S.

Learn morw about this silicone below.

Description

Mold Silicone - Medium (30 Shore A) - Technical Data:

Working time: max. 20 min
Curing time: approx. 5 hours
Hardness (shore A): 30
Color: White
Viscosity: approx. 21000 mPa.s
Elasticity: 450%
Tensile strength: 4,8 MPa
Tear strength: 28 kN/m
Shrinkage: <0.2%
Melting point: 160ºC

Note: Data applies at 25°C room temperature.

Effecient Silicone Usage for Mold Production
Plan your silicone requirements accurately to optimize material use and reduce waste:

Choose a mold box with at least 1 cm clearance on all sides of your object.
Calculate the total box volume (Length x Width x Height).
Subtract the object’s volume using water displacement or CAD data
Convert volume to silicone weight: 1 kg silicone ≈ 800 cm³.

Example: A 15 × 9 × 10 cm mold box = 1350 cm³. Object volume = 230 cm³ → net silicone volume = 1120 cm³. Required silicone = 1120 ÷ 800 ≈ 1.4 kg.

Mixing and Working with Silicone

Each container of curing agent is designed for 1 kg of silicone.
Mix only the amount you need for the project.
Maximum working time after mixing: 20 minutes.

Forming and Layering

When creating multi-part molds, apply a thin layer of release agent on the cured silicone to prevent the new layer from bonding.
Same principle applies when casting silicone into a silicone mold: always use release agent to prevent adhesion between layers.

Tips

Use gloves when handling silicone.
Apply thin first layers to capture all details before adding thicker layers (5-10 mm) for mold strength.
Silicone cures at room temperature but can be accelerated with controlled heat.

Video Tutorial

Watch our step-by-step guide for casting silicone, demonstrating proper techniques including layering, release agent application, and mold finishing. Materials used in the tutorial include modeling clay, a cardboard box, petroleum jelly, and elastic bands.

Data Sheet: Mold silicone 30, 40, 50 - click here

Data sheet: Catalyst for Liquid silicone - click here