Choosing tubing isn't just about finding something the right diameter. The material determines what temperature range it can handle, what fluids it's compatible with, whether it meets food-grade requirements, and how much punishment it takes before it kinks or cracks. Here's a practical breakdown of the five materials you'll encounter most often.
Vinyl (PVC)
Clear vinyl tubing is cheap, widely available, and adequate for low-temperature, low-pressure water and beverage applications. It's transparent, which is genuinely useful for monitoring flow. The downsides: it becomes stiff in cold environments, softens and deforms under heat, typically above 60°C/140°F, and can impart flavour or odour when new. It's also less durable under UV exposure than other materials.
Silicone
Silicone is the go-to material for food and beverage process lines that see temperature variation. It handles from -60°C to around 200°C, remains flexible throughout that range, is FDA-compliant, and has excellent flavour neutrality.
Silicone's weakness is mechanical abrasion, as it's not particularly tough on the outside and will wear if dragged repeatedly over rough surfaces. It's also gas-permeable, which matters in long-term storage applications but is irrelevant for transfer lines.
Silicone Braided (Reinforced)
Braided silicone adds a polyester braid between inner and outer silicone layers, increasing pressure rating and kink resistance dramatically. Where standard silicone tubing starts to balloon or collapse under higher pressures, braided silicone holds its shape. The trade-off is reduced flexibility. For pump discharge lines, pressurised transfer, and anywhere the tubing sees variable pressure, braided silicone is a better choice than plain silicone.
PDMS Silicone
PDMS is high quality silicone with exceptionally high purity, used in applications where standard food-grade silicone isn't clean enough.
Polyethylene
Polyethylene tubing is semi-rigid rather than flexible and is used with compression fittings rather than barbed connections. It's chemically resistant to a wider range of substances than flexible elastomers, dimensionally stable, and suitable for many food contact applications. The lack of flexibility means it needs to be properly supported and routed without sharp bends.