When a fluid line has to turn tight corners inside a machine, Transparent Silicone Tube helps keep the bore open. The product page describes it as soft and kink-resistant, and the three specs buyers usually check are hardness from 30 to 80 Shore A, dimensional tolerance of ±0.1 mm as standard (down to ±0.05 mm for precision grades), and service from -50°C to 200°C. Set diameter, wall and hardness together, then bend a sample to the real radius, and kinking gets solved at the sampling stage.
A bend that stays open keeps flow steady downstream
Once a tube kinks, the section collapses into a slit: the pump keeps pushing while flow stops or back pressure rises. Lixing’s transparent silicone tube is soft and kink-resistant, and the product page notes its elastic recovery, so bends in compact fluid routing are more likely to stay open.
Uniform wall all the way round, so no thin side gives way early
In thin-wall tube theory, a thinner wall becomes unstable sooner, which is why the thin side of an uneven tube tends to fold first. This platinum-cured transparent silicone tube is made by automated extrusion; the product page states a round, non-flattened bore and highly uniform wall thickness, with ±0.1 mm standard tolerance and ±0.05 mm for precision grades. An even wall makes the bend shape easier to predict.
Choose 30A to 80A hardness to match mounting and line pressure
The same tube is offered from 30 to 80 Shore A. In the thin-wall model, critical bending curvature depends only on wall thickness, diameter and Poisson’s ratio, and the elastic modulus cancels out. Hardness changes how much force it takes to route the tube and whether the section holds its shape under vacuum or a pinch clamp. Softer grades suit hand-routed or frequently removed lines, and suction lines under vacuum should include a harder grade in the sample comparison.
A clear wall lets you see whether the bend is flattening
The product page lists high clarity, no odor and no surface blooming over long-term use. During commissioning you can watch the bend and the liquid inside, so a bore that starts to flatten shows up on the spot without removing the tube.
Soft and elastic from -50°C to 200°C
According to the product page, the tube keeps its flexibility and kink resistance across -50°C to 200°C. When a chilled section and a hot cleaning section share one line, one tube material can be evaluated for both, with the bend shape checked at the actual temperature.
Food equipment, pharma and lab lines with one less stoppage point
Listed applications include food equipment, pharmaceuticals, laboratories and high-end electronic sealing. In fluid transfer and platinum cured tubing work, enclosures are tight and lines turn between pumps, valves and vessels; kink resistance gives routing more room, and the clear wall adds a visual check during routine inspection. For the purity side of the same tube, see our note on food-grade transparent silicone tube selection.
Why larger diameters kink sooner: the Brazier model
When a round tube bends, the outer side stretches and the inner side compresses, and both longitudinal forces push the wall toward the neutral axis until the circle flattens into an oval. L. G. Brazier’s 1927 analysis of thin cylindrical shells in the Proceedings of the Royal Society gives the critical curvature at which the section becomes unstable:
κ_cr = (t / (3·r²)) · √(2 / (1 − ν²))
κ_cr is the bending curvature at which kinking starts (1/mm), and its inverse is the critical bend radius; t is wall thickness (mm); r is the mean wall radius (mm), roughly (ID + OD) / 4; ν is Poisson’s ratio, close to 0.5 for silicone rubber. The critical bend radius scales with r²/t: doubling the diameter at the same wall roughly quadruples it, and doubling the wall roughly halves it.
The model assumes a thin wall, linear elasticity and pure bending. Silicone tubing is usually thick-walled and deforms strongly, and the model leaves out internal pressure, temperature and clamping, so use it to compare size options rather than as a product specification or guarantee. Confirm the usable bend radius by bending a sample of the specified size.
Send these details with your enquiry
- Inner and outer diameter (or wall thickness) and the tolerance grade you need
- Where the tightest-radius bends sit and how the line is routed
- Hardness preference and whether the line runs under pressure, vacuum or neither
- Operating temperature range and the fluid being carried
Tight routing starts with the diameter-to-wall ratio
Kink resistance in a transparent silicone tube comes from size ratio, hardness and mounting working together. Compare candidate sizes with r²/t, then bend a sample at the real radius, and the bore at each turn is far more likely to stay clear. For samples or a specification review, contact Lixing Composite Materials Co., Ltd. through the Transparent Silicone Tube product page or at yw@zh-lx.com.
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