Does 1kg of Silicone Make a 1-Litre Mould?

← Back to With one kg of GLS-50 silicone rubber, how many liters can I make?

If you’re preparing to make your own silicone moulds, it’s essential to know how much volume 1kg of silicone rubber will yield. Many assume it equates to 1 litre, but the reality is a little different.

Understanding Silicone Rubber Density

The key factor is density: silicone rubber is denser than water. Whereas 1kg of water perfectly fills a 1-litre container, 1kg of silicone generally produces about 0.85 to 0.9 litres. This smaller volume means you’ll need a little more silicone than you might first think, especially for larger or multiple moulds.

Practical Planning for Your Moulds

When measuring for your project, calculate the required silicone based on mould dimensions, not just weight. Allow a margin above the mould’s volume to ensure you have enough material. For instance, if your mould’s interior is 1 litre, plan to use at least 1.1 to 1.2kg of silicone rubber for a safe margin. Bi-component silicones, such as the “Liquid Mould” casting silicone rubber, should always be mixed according to supplier guidelines before pouring.

When This Matters: Avoiding Shortfall

If you’re casting an intricate mould or working on multiple projects, running short can disrupt detail and cause waste. Knowing the correct volume yield per kg helps you purchase and prepare the right amount, saving time and reducing errors.

Related guides

Understanding the volume yield of silicone makes mould-making smoother and more predictable. For more detail on getting the most from your silicone, visit our main guide on how much volume 1kg of GLS-50 can produce.