Red Food Grade Silicone Capillary Tube — ID 0.3mm to 4mm, 10 Meter

Match the Inner Diameter (ID) to the outer diameter of the fitting or nozzle the tube will slip over or connect to. The Outer Diameter (OD) determines how the tube fits inside a housing or clamp. For example, a 2mm × 4mm tube has a 1mm wall on each side. When in doubt, size up slightly — a marginally larger ID is easier to work with than one that's too tight. If you need an inch equivalent: 1mm ≈ 0.039", so a 3mm ID ≈ 0.118" (close to 1/8").

Silicone capillary tubing in these sizes is generally suited for low-to-moderate pressure. Micro-bore sizes (ID under 1mm) typically handle under 30 PSI; larger sizes (ID 2mm–4mm) can generally manage 60–80 PSI depending on wall thickness. For pressure-critical applications, contact us to confirm the rating for your specific ID × OD combination.

Yes. This tubing is made from a food-grade silicone compound that is generally non-toxic, odorless, and tasteless. It is commonly used in homebrewing, beverage dispensing, and food-processing micro-lines. It does not impart flavor or odor to liquids passing through it and is free of BPA and phthalates.

Yes. Silicone is inherently UV- and ozone-resistant, so it stays flexible outdoors without cracking or stiffening. It typically performs from approximately -60°C (-76°F) to +200°C (+392°F). For continuous steam or autoclave use above 150°C, contact us to confirm suitability for your specific size and wall thickness.

This tubing works with standard barbed fittings, luer-lock and luer-slip connectors, blunt-tip dispensing needles, and push-fit adapters. For micro-bore sizes (ID 0.3mm–1mm), blunt-tip dispensing needles or luer-slip adapters are the most common connection method. Always verify the barb OD matches the tube ID for a secure, leak-free fit.

Yes — soft silicone is one of the most widely used materials in peristaltic pump heads because it rebounds quickly after roller compression without fatigue cracking. Select the ID and OD that match your pump head's channel dimensions. Most lab-grade and aquarium peristaltic pumps specify tubing by ID and wall thickness; check your pump manual for the exact size needed.

Use a sharp razor blade or dedicated tubing cutter rather than scissors, which can compress the soft silicone and collapse the bore — especially critical for micro-bore sizes under 1mm ID. Make a single clean slice perpendicular to the tube axis. Avoid sawing motions. For very small bores, a fresh single-edge razor blade gives the cleanest cut.

Both have the same 2mm inner bore, but the 2mm × 4mm has a thicker wall (1mm vs. 0.5mm per side). Choose the thicker wall when you need more crush resistance in a peristaltic pump or higher pressure tolerance. Choose the thinner wall when the tube must fit inside a tight housing or when flexibility is the priority. The ID — not the OD — determines flow capacity.