Silicone Rubber
Silicone Rubber is a crafted component in Subnautica 2, refined from Cave Sulfur at the Fabricator. It is the foundation of all waterproof gear, including fins, gloves, and the Radiation Suit components that keep you alive in irradiated and high-pressure environments.
Quick Info
How to Craft & Source Materials
Silicone Rubber is crafted at the Fabricator from 1 Cave Sulfur. Cave Sulfur is harvested from Sulfur Plants in the Kelp Forest, but the plants are defensive — they explode when approached too quickly, so slow, deliberate movement is required to harvest them safely.
Cave Sulfur (x1)
Harvested from Sulfur Plants in the Kelp Forest. Approach plants slowly to avoid triggering their explosion.
Hazardous harvestKelp Forest
50–150m — the only biome where Sulfur Plants grow in numbers.
Primary sourceShallow Caves
0–50m — occasional Sulfur Plants in small caves near the Safe Shallows.
Low yield, safe farmUses & Recipes
Silicone Rubber is the gateway to mobility and protection. Fins dramatically increase your swim speed, while gloves let you handle hazardous materials and access the Radiation Suit set required to approach the Aurora after its drive core explodes.
Fins
Increase swim speed for faster exploration and resource gathering.
Waterproof Gloves
Required for handling hazardous materials and advanced tool crafting.
Radiation Suit Gloves
Component of the Radiation Suit set required for the Aurora wreck.
Crafting Calculator
Plan your total Silicone Rubber needs across all recipes.
Tips & Strategies
Approach Sulfur Plants Slowly
Sulfur Plants explode if you approach too quickly, dealing damage and destroying the harvest. Swim at a slow, steady pace toward the plant and grab the sulfur as soon as the prompt appears.
Heal Between Harvests
Even careful harvesting triggers occasional explosions. Carry a Medkit or two and heal between plants so a single bad harvest doesn't put you in danger while deep in the Kelp Forest.
Craft Fins First
Fins are the highest-leverage early Silicone Rubber sink. The swim speed boost lets you cover more ground per oxygen tank, which compounds into faster resource gathering across every future biome.
Bank for the Radiation Suit
The Radiation Suit gloves require Silicone Rubber. Pre-bank 2–3 pieces before the Aurora event so you can craft the full suit set the moment radiation leaks begin.
Related Resources
Source Material Locations
Silicone Rubber is crafted, but its source material — Cave Sulfur — is harvested from Sulfur Plants in the Kelp Forest. Pin Sulfur Plant clusters on the interactive map to plan repeatable farm runs.
View on Interactive Map →Frequently Asked Questions
How do I craft Silicone Rubber?
Silicone Rubber is crafted at the Fabricator from 1 Cave Sulfur. No other materials are required, and the recipe is available from the start of the game, so you can produce it as soon as you harvest your first Sulfur Plant.
Where do I get Cave Sulfur?
Cave Sulfur is harvested from Sulfur Plants in the Kelp Forest. The plants can explode if approached too quickly, so swim slowly toward them and grab the sulfur as soon as the harvest prompt appears.
What is Silicone Rubber used for?
Silicone Rubber is used for Fins, Waterproof Gloves, Radiation Suit Gloves, and several early survival gear items. Fins are the highest-leverage early sink because they boost swim speed for every future activity.
Is Cave Sulfur renewable?
Yes, Sulfur Plants respawn over time, so you can revisit the Kelp Forest after a few in-game days and harvest fresh Cave Sulfur. There is no hard cap on total Silicone Rubber production in a playthrough.
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