Zero-Base Silicone Rubber Tutorial
This article focuses on sharing beginner-friendly techniques for making silicone molds, including how to avoid curing issues and accurately measure silicone liquid. We recommend watching our step-by-step video first for a clearer visual guide. Ready to begin? Let’s dive right in!
- Material Preparation
- Environment Setup
- Step-by-step operation process
- Quick Cleaning Tips
- Finished Product Maintenance
- FAQs for Beginners
1. Material Preparation
- Material: 15A Silicone Rubber
- Tools: Measuring Cups, Mixing Sticks or Auto Electric Mixer, Mold Housing(plastic borders, acrylic sheets, plastic cups, etc.), Hot Glue Gun
- Protective Equipment: Always wear nitrile waterproof gloves, a waterproof apron, and a vapor mask for safe handling.
2. Environment Setup
- Ideal Conditions: Maintain a temperature between 73–78°F with humidity no higher than 50–60% RH.
- Ventilation: Work in a well-ventilated area, ideally near a window, or use an air purifier for better airflow.
3. Step-by-Step Instructions
| Protective Equipment |
|---|
| Always wear nitrile waterproof gloves, a waterproof apron, and a vapor mask for safe handling. |
Step 1: Master Molds and Mold Housing Materials Selection
①Master Mold
The master mold is what we want to use to make a mold. The silicone rubber cannot be cured if the material of the master mold is not suitable. It is prone to curing inhibition when exposed to certain chemicals, materials, and elements.
Recommended Materials：epoxy resin finished projects, glass, ceramics, acrylic, air-dry clay
Prohibited materials： fresh wood with moisture, UV resin craft, candles, 3D printing photosensitive materials.
Cautions
For uncertain master mold compatibility, it's recommended to apply a small amount of silicone rubber on the master mold surface for testing.
If you want to make a mold for wood, we recommend applying a layer of sealant on the surface and waiting for it to cure before pouring the silicone rubber.
②Mold Housing
The mold housing is a frame for fluid silicone rubber. It can be many different materials.
Recommended materials (waterproof required): plastic, acrylic, plastic cups, Aluminum foil, cookie cutters, PVC.
Step 2: How to measure the amount of Silicone Rubber?
Secure a master mold in a container. Fill the container with water until it covers both the master mold and its enclosure (over 5mm). Pour the water into the measuring cup and note the volume. This measured volume is the amount of silicone needed.
Step 3: How to make a mold with silicone rubber?
A. How to secure the master mold?
- Create an appropriate size for the mold housing according to the size of the master mold
- Secure the master mold on PVC with hot melt glue. Just use a small amount of hot glue at the bottom, as too much glue may cause cure inhibition with the silicone rubber.
- Seal the edge of the mold housing with hot melt glue to prevent the silicone liquid from leaking.
B. Mixing Ratio & Curing Condition
- Mix the silicone rubber in a 1：1 ratio by weight. Pour an equal weight of Part A and Part B into a mixing container.
- Stir consistently in one direction: Stir at a constant speed in one direction while scraping the cup walls and bottom to ensure complete mixing. Mix thoroughly for approximately 3 minutes, but complete the entire operation within 30 minutes to prevent curing of the silicone rubber.
- Pour the silicone rubber into the container. It will deform automatically within 2 hours.
- At a room temperature of 77℉ (25°C), the curing time is 3 to 6 hours.
Cautions
- During curing, cover the silicone rubber with a lid to prevent exposure to dust/moisture, which may cause incomplete curing or surface imperfections.
- For large or detailed master molds, it's recommended to pour the silicone liquid layer by layer to ensure that the silicone rubber covers all parts and details.
C. Mold Trimming
- After it cures, remove the mold housing and PVC sheet, then remove the master mold carefully.
- Gently lift the excess silicone with one hand while using the trimming tool. On the other hand, quickly and neatly remove any excess along the edges. This will ensure your mold has a smooth and clean finish.
4. Quick Cleaning Tips
Silicone naturally has some anti-slip properties when dry, which makes it easy for dust to stick to the surface. To keep the mold clean, gently wipe it with baby wipes or non-corrosive soapy water before and after each use. You can also remove leftover resin with tape. After cleaning, seal the mold with plastic wrap to keep it dust-free and ready for next time.
5. Finished Product Maintenance
Maintenance is key to preserving aesthetics and extending lifespan. Here are specific care suggestions:
Core Principles: Flat Storage & Gentle Cleaning
Cleaning
Tip：To clean the mold properly, use warm, soapy water or neutral detergent.
Caution：Avoid scratching the surface with abrasive tools. After cleaning, let it dry thoroughly and wrap it with plastic film for storage.
Storage
Tip：Do not place heavy objects on cured silicone products to prevent deformation.
Caution：For proper storage, store the mold flat in a dry, cool, and ventilated area. Away from direct sunlight and high temperatures, as UV rays and humidity will shorten its surface life.
6. Frequently Asked Questions
