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Burst Pressure and Vacuum Ratings in Braided Silicone Hose: How to Read the Numbers
2026-10-19 17:40:29
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Burst pressure in our braided silicone hose falls as bore grows, from ≥ 38 kg at ID 3 mm to ≥ 12 kg at ID 31.75 mm. This guide explains why the rating drops with diameter, what fully vacuum capable means, and what to specify for your line.
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Technical Guide · Pressure & Vacuum
In our braided silicone hose range (ID 3–31.75 mm), burst pressure falls as bore size increases: ≥ 38 kg at ID 3–5 mm, ≥ 35 kg at ID 6.35–9.52 mm, ≥ 25 kg at ID 12.7 mm, ≥ 23 kg at ID 15.87 mm, ≥ 18 kg at ID 19.05 mm, and ≥ 12 kg at ID 25.4–31.75 mm.
| Minimum burst≥ 12–38 kg | Bore rangeID 3–31.75 mm | Vacuum dutyFully vacuum capable | LinerPlatinum-cured silicone |
Burst pressure across the range
The figures below are the published data sheet values for our standard polyester-braided construction: a platinum-cured silicone liner, one high-temperature polyester braid, and a silicone cover. Eleven models span 3 mm to 31.75 mm internal diameter; read every number as a limit, because burst and bend radius are both stated as minimums.
| Model | ID (mm) | OD (mm) | Wall thickness (mm) | Minimum burst (kg) | Minimum bend radius (mm) |
|---|---|---|---|---|---|
| HJBX-001 | 3 ± 0.5 | 8 ± 0.5 | 2.5 | ≥ 38 | 35 |
| HJBX-002 | 4 ± 0.5 | 9 ± 0.5 | 2.5 | ≥ 38 | 35 |
| HJBX-003 | 5 ± 0.5 | 11 ± 0.5 | 3.0 | ≥ 38 | 35 |
| HJBX-004 | 6.35 ± 0.5 | 12 ± 0.5 | 2.825 | ≥ 35 | 35 |
| HJBX-005 | 7.93 ± 0.5 | 15 ± 0.5 | 3.535 | ≥ 35 | 50 |
| HJBX-006 | 9.52 ± 0.5 | 17 ± 0.5 | 3.74 | ≥ 35 | 50 |
| HJBX-007 | 12.7 ± 0.7 | 22 ± 0.7 | 4.65 | ≥ 25 | 70 |
| HJBX-008 | 15.87 ± 0.7 | 25 ± 0.7 | 4.565 | ≥ 23 | 80 |
| HJBX-009 | 19.05 ± 0.7 | 31 ± 0.7 | 5.975 | ≥ 18 | 110 |
| HJBX-010 | 25.4 ± 0.7 | 38 ± 0.7 | 6.3 | ≥ 12 | 150 |
| HJBX-011 | 31.75 ± 0.7 | 46 ± 0.7 | 7.125 | ≥ 12 | 200 |
About the kg column. Burst pressure is quoted in kg because kg is the unit on the published data sheet, the original unit of record. We have not restated it in another pressure unit, because that would attach a definition the data sheet does not make. If you need bar or psi, ask and we will send the equivalent with the TDS.
The rating does not belong to the product family; it belongs to the model: a 3 mm hose is rated at ≥ 38 kg, a 31.75 mm hose at ≥ 12 kg.
Why burst pressure drops as bore grows
The trend is mechanical, not commercial. Internal pressure pushes outward on the wall, and the wall resists around the circumference. For a thin-walled cylinder the circumferential stress is p·D/(2t) — pressure times diameter, divided by twice the wall thickness. Rearranged into the pressure the wall can hold, p = 2·t·σ/D: with a fixed material strength σ, capacity is inversely proportional to diameter. Double the bore and, with nothing else changed, you halve the rating.
In a braided hose the silicone does not carry most of that load: the liner contains the medium, passes the load outward to the braid, and the braid carries it. The braid construction is unchanged across the standard models. As the bore grows, the circumference grows with it, so each unit length of braid takes a larger share of the force.
Our own table shows the consequence: wall thickness rises with bore, from 2.5 mm to 7.125 mm, but more slowly than the diameter — about 2.9 times against about 10.6 times — so t/D falls and the rating falls with it. A large-bore line therefore cannot carry the working pressure a small-bore line carries, even within the same family; when it needs more, the answer is a different reinforcement, not a longer piece of the same hose.
What "fully vacuum capable" means
Vacuum duty reverses the load: the pressure outside the hose is higher than inside, so the wall is pushed inward. A plain silicone tube resists that poorly — as bore grows it flattens, and the failure is quiet, with the line looking intact while the bore narrows or kinks closed.
The braid changes the answer. The same layer that resists expansion also resists diametral collapse, acting as a cage around the liner. That is the basis of the phrase "fully vacuum capable" in our documentation: the standard polyester-braided hose is intended for full vacuum service.
Four boundaries decide whether that capability survives into your installation.
- Bend radius. A hose pulled tighter than its minimum is already stressed before vacuum is applied, and vacuum plus a tight bend loads the same wall twice. Stay at or above the minimum.
- Temperature. Silicone stays flexible, but stiffness falls as temperature rises, and collapse resistance falls with it. Confirm the rating at your real operating temperature.
- Medium. Some media swell or soften the liner, and a swollen liner can fold inward under vacuum.
- Connections. An assembly is only as vacuum-tight as its ends, so clamps, barbs and the hose-to-fitting fit matter as much as the body.
One distinction matters. "Fully vacuum capable" describes a service capability, not a rated vacuum level. A figure for your line — absolute or gauge — depends on bore, temperature, bend radius and the assembly, so we confirm it per project.
How to specify for your application
Give us these inputs and the recommendation becomes concrete:
- Medium, including concentration if it is a solution or cleaning agent.
- Working pressure, plus peak or pulsating pressure and how often it cycles.
- Vacuum level, as absolute or gauge, and whether continuous or intermittent.
- Operating temperature range, including any hot flush or cleaning cycle.
- Installed bend radius, taken on the real route rather than from a drawing.
- End connections — type, size, material. Silicone parts are made in our plant; metal and plastic connectors come through our partner network.
- Certification the file requires. FDA, ROHS, REACH, NSF and LFGB can be provided as they apply; ISO 13485, ISO 9001 and Class 100,000 cleanroom production are available according to customer requirements. Where biocompatibility is required we provide all three ISO 10993 reports — cytotoxicity, skin sensitization and skin irritation.
One pressure rule matters more than any other: the burst figure is a failure threshold, not a working pressure. Size the line from the working and peak pressure your system actually produces, then apply the safety factor your engineering or regulatory standard requires. That ratio is not universal — ISO 7751:2016 sets ratios of proof and burst pressure to maximum working pressure by hose service category. We do not publish one universal factor; we recommend a working pressure for a specific model against the duty you describe.
Burst figures are established by hydrostatic testing, and the method is standardized — ISO 1402:2021 covers the procedure. A test result is a controlled-condition limit, not a field measurement, and it should never be read as an operating pressure.
The hose is built as a transparent platinum-cured silicone liner and cover over a high-temperature polyester braid: 70 Shore A liner, 60 Shore A cover, −40 °C to +200 °C (−40 °F to +392 °F). Like our other medical silicone hose ranges, it is not for human implant.
Frequently asked questions
What unit is the kg column, and how do I convert it?
The data sheet states minimum burst as a kg value, and we reproduce it exactly as published rather than converting it ourselves. If your engineering file needs bar or psi, ask for the TDS for the model you are considering and we will confirm the conversion for that model with the document.
Can I use the burst pressure as my working pressure?
No — it is the pressure at which the hose fails, not a pressure it is designed to run at. Choose the model from your working and peak pressure, then apply the safety factor that your own engineering or regulatory standard sets. That factor is not universal: ISO 7751 groups hose service categories precisely because the ratio differs between them. We recommend a working pressure for a specific model against the duty you describe, rather than quote one blanket number.
How much vacuum can the hose hold?
The standard polyester-braided hose is rated for full vacuum service. A specific vacuum level for your line — absolute or gauge — depends on bore, temperature, installed bend radius and the assembly, so we confirm it per project rather than publish one figure.
Do steel wire or mesh constructions have higher ratings?
They are custom constructions we build for duties beyond the standard braid, and we do not publish burst or vacuum figures for them. The values depend on the construction agreed for the project, so they are evaluated and confirmed per project.
How do I get the TDS and a sample?
Send the inputs listed above — medium, working and peak pressure, vacuum level, temperature, bend radius, connections and certifications — and we will send the TDS for the matching model, plus sample availability. In-stock samples ship in 3 days; standard items are 5–7 days; custom builds are typically 10–20 working days.
Related reading
- Braided vs reinforced vs steel wire silicone hose — how the three reinforcement types differ and how to choose.
- Braided silicone hose for oxygen concentrators — where pressure and vacuum duty appear on a concentrator circuit.
- High-pressure resistant braided silicone hose — the custom construction for duties above the standard braid.
- Standard braided silicone tube — the eleven-model construction this table describes.
- Steel wire braided silicone hose — the custom construction for duties the standard braid cannot cover.
Next step
Tell us the bore and wall, the working and peak pressure, whether the line runs under vacuum, the temperature, the medium, the installed bend radius, the connection type and the certifications your file requires. Send the ID and OD if you are unsure which of the eleven models fits. If your duty sits outside the standard range, say so in the first message — that is a custom discussion, not a problem.
Need the burst and vacuum numbers for your line?
Tell us the bore, the pressure and vacuum duty and the operating temperature, and we will reply with the model, a recommended working pressure and the lead time.
References
- ISO 1402:2021 — Rubber and plastics hoses and hose assemblies — Hydrostatic testing. Accessed 19 October 2026. Background on the hydrostatic test method behind burst figures.
- ISO 7751:2016 — Rubber and plastics hoses and hose assemblies — Ratios of proof and burst pressure to maximum working pressure. Accessed 19 October 2026. Background on how those ratios are set by hose service category.
Both are cited as background on how hose pressure ratings are defined and tested, not as evidence that our products are certified against either standard. If a project requires testing to a named standard, tell us and we will confirm what can be provided.
DongGuan Yutian Silicone Rubber Technology Co., Ltd — silicone extrusion manufacturer since 2012. 6,800 m² facility · 14 extrusion lines · 4 calendering lines · 7 compression moulding lines · Class 100,000 cleanroom · monthly capacity up to 8,000,000 meters. Room 801, Building 10, No. 2 Tutang Industrial 2nd Heng Road, Changping Town, Dongguan, Guangdong, China.
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Dongguan Yutian Silicone Rubber Technology Co., Lt
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Burst Pressure and Vacuum Ratings in Braided Silicone Hose: How to Read the Numbers
Author：Dongguan Yutian Silicone Rubber Technology Co., Lt
Technical Guide · Pressure & Vacuum
In our braided silicone hose range (ID 3–31.75 mm), burst pressure falls as bore size increases: ≥ 38 kg at ID 3–5 mm, ≥ 35 kg at ID 6.35–9.52 mm, ≥ 25 kg at ID 12.7 mm, ≥ 23 kg at ID 15.87 mm, ≥ 18 kg at ID 19.05 mm, and ≥ 12 kg at ID 25.4–31.75 mm.
| Minimum burst≥ 12–38 kg | Bore rangeID 3–31.75 mm | Vacuum dutyFully vacuum capable | LinerPlatinum-cured silicone |
Burst pressure across the range
The figures below are the published data sheet values for our standard polyester-braided construction: a platinum-cured silicone liner, one high-temperature polyester braid, and a silicone cover. Eleven models span 3 mm to 31.75 mm internal diameter; read every number as a limit, because burst and bend radius are both stated as minimums.
| Model | ID (mm) | OD (mm) | Wall thickness (mm) | Minimum burst (kg) | Minimum bend radius (mm) |
|---|---|---|---|---|---|
| HJBX-001 | 3 ± 0.5 | 8 ± 0.5 | 2.5 | ≥ 38 | 35 |
| HJBX-002 | 4 ± 0.5 | 9 ± 0.5 | 2.5 | ≥ 38 | 35 |
| HJBX-003 | 5 ± 0.5 | 11 ± 0.5 | 3.0 | ≥ 38 | 35 |
| HJBX-004 | 6.35 ± 0.5 | 12 ± 0.5 | 2.825 | ≥ 35 | 35 |
| HJBX-005 | 7.93 ± 0.5 | 15 ± 0.5 | 3.535 | ≥ 35 | 50 |
| HJBX-006 | 9.52 ± 0.5 | 17 ± 0.5 | 3.74 | ≥ 35 | 50 |
| HJBX-007 | 12.7 ± 0.7 | 22 ± 0.7 | 4.65 | ≥ 25 | 70 |
| HJBX-008 | 15.87 ± 0.7 | 25 ± 0.7 | 4.565 | ≥ 23 | 80 |
| HJBX-009 | 19.05 ± 0.7 | 31 ± 0.7 | 5.975 | ≥ 18 | 110 |
| HJBX-010 | 25.4 ± 0.7 | 38 ± 0.7 | 6.3 | ≥ 12 | 150 |
| HJBX-011 | 31.75 ± 0.7 | 46 ± 0.7 | 7.125 | ≥ 12 | 200 |
About the kg column. Burst pressure is quoted in kg because kg is the unit on the published data sheet, the original unit of record. We have not restated it in another pressure unit, because that would attach a definition the data sheet does not make. If you need bar or psi, ask and we will send the equivalent with the TDS.
The rating does not belong to the product family; it belongs to the model: a 3 mm hose is rated at ≥ 38 kg, a 31.75 mm hose at ≥ 12 kg.
Why burst pressure drops as bore grows
The trend is mechanical, not commercial. Internal pressure pushes outward on the wall, and the wall resists around the circumference. For a thin-walled cylinder the circumferential stress is p·D/(2t) — pressure times diameter, divided by twice the wall thickness. Rearranged into the pressure the wall can hold, p = 2·t·σ/D: with a fixed material strength σ, capacity is inversely proportional to diameter. Double the bore and, with nothing else changed, you halve the rating.
In a braided hose the silicone does not carry most of that load: the liner contains the medium, passes the load outward to the braid, and the braid carries it. The braid construction is unchanged across the standard models. As the bore grows, the circumference grows with it, so each unit length of braid takes a larger share of the force.
Our own table shows the consequence: wall thickness rises with bore, from 2.5 mm to 7.125 mm, but more slowly than the diameter — about 2.9 times against about 10.6 times — so t/D falls and the rating falls with it. A large-bore line therefore cannot carry the working pressure a small-bore line carries, even within the same family; when it needs more, the answer is a different reinforcement, not a longer piece of the same hose.
What "fully vacuum capable" means
Vacuum duty reverses the load: the pressure outside the hose is higher than inside, so the wall is pushed inward. A plain silicone tube resists that poorly — as bore grows it flattens, and the failure is quiet, with the line looking intact while the bore narrows or kinks closed.
The braid changes the answer. The same layer that resists expansion also resists diametral collapse, acting as a cage around the liner. That is the basis of the phrase "fully vacuum capable" in our documentation: the standard polyester-braided hose is intended for full vacuum service.
Four boundaries decide whether that capability survives into your installation.
- Bend radius. A hose pulled tighter than its minimum is already stressed before vacuum is applied, and vacuum plus a tight bend loads the same wall twice. Stay at or above the minimum.
- Temperature. Silicone stays flexible, but stiffness falls as temperature rises, and collapse resistance falls with it. Confirm the rating at your real operating temperature.
- Medium. Some media swell or soften the liner, and a swollen liner can fold inward under vacuum.
- Connections. An assembly is only as vacuum-tight as its ends, so clamps, barbs and the hose-to-fitting fit matter as much as the body.
One distinction matters. "Fully vacuum capable" describes a service capability, not a rated vacuum level. A figure for your line — absolute or gauge — depends on bore, temperature, bend radius and the assembly, so we confirm it per project.
How to specify for your application
Give us these inputs and the recommendation becomes concrete:
- Medium, including concentration if it is a solution or cleaning agent.
- Working pressure, plus peak or pulsating pressure and how often it cycles.
- Vacuum level, as absolute or gauge, and whether continuous or intermittent.
- Operating temperature range, including any hot flush or cleaning cycle.
- Installed bend radius, taken on the real route rather than from a drawing.
- End connections — type, size, material. Silicone parts are made in our plant; metal and plastic connectors come through our partner network.
- Certification the file requires. FDA, ROHS, REACH, NSF and LFGB can be provided as they apply; ISO 13485, ISO 9001 and Class 100,000 cleanroom production are available according to customer requirements. Where biocompatibility is required we provide all three ISO 10993 reports — cytotoxicity, skin sensitization and skin irritation.
One pressure rule matters more than any other: the burst figure is a failure threshold, not a working pressure. Size the line from the working and peak pressure your system actually produces, then apply the safety factor your engineering or regulatory standard requires. That ratio is not universal — ISO 7751:2016 sets ratios of proof and burst pressure to maximum working pressure by hose service category. We do not publish one universal factor; we recommend a working pressure for a specific model against the duty you describe.
Burst figures are established by hydrostatic testing, and the method is standardized — ISO 1402:2021 covers the procedure. A test result is a controlled-condition limit, not a field measurement, and it should never be read as an operating pressure.
The hose is built as a transparent platinum-cured silicone liner and cover over a high-temperature polyester braid: 70 Shore A liner, 60 Shore A cover, −40 °C to +200 °C (−40 °F to +392 °F). Like our other medical silicone hose ranges, it is not for human implant.
Frequently asked questions
What unit is the kg column, and how do I convert it?
The data sheet states minimum burst as a kg value, and we reproduce it exactly as published rather than converting it ourselves. If your engineering file needs bar or psi, ask for the TDS for the model you are considering and we will confirm the conversion for that model with the document.
Can I use the burst pressure as my working pressure?
No — it is the pressure at which the hose fails, not a pressure it is designed to run at. Choose the model from your working and peak pressure, then apply the safety factor that your own engineering or regulatory standard sets. That factor is not universal: ISO 7751 groups hose service categories precisely because the ratio differs between them. We recommend a working pressure for a specific model against the duty you describe, rather than quote one blanket number.
How much vacuum can the hose hold?
The standard polyester-braided hose is rated for full vacuum service. A specific vacuum level for your line — absolute or gauge — depends on bore, temperature, installed bend radius and the assembly, so we confirm it per project rather than publish one figure.
Do steel wire or mesh constructions have higher ratings?
They are custom constructions we build for duties beyond the standard braid, and we do not publish burst or vacuum figures for them. The values depend on the construction agreed for the project, so they are evaluated and confirmed per project.
How do I get the TDS and a sample?
Send the inputs listed above — medium, working and peak pressure, vacuum level, temperature, bend radius, connections and certifications — and we will send the TDS for the matching model, plus sample availability. In-stock samples ship in 3 days; standard items are 5–7 days; custom builds are typically 10–20 working days.
Related reading
- Braided vs reinforced vs steel wire silicone hose — how the three reinforcement types differ and how to choose.
- Braided silicone hose for oxygen concentrators — where pressure and vacuum duty appear on a concentrator circuit.
- High-pressure resistant braided silicone hose — the custom construction for duties above the standard braid.
- Standard braided silicone tube — the eleven-model construction this table describes.
- Steel wire braided silicone hose — the custom construction for duties the standard braid cannot cover.
Next step
Tell us the bore and wall, the working and peak pressure, whether the line runs under vacuum, the temperature, the medium, the installed bend radius, the connection type and the certifications your file requires. Send the ID and OD if you are unsure which of the eleven models fits. If your duty sits outside the standard range, say so in the first message — that is a custom discussion, not a problem.
Need the burst and vacuum numbers for your line?
Tell us the bore, the pressure and vacuum duty and the operating temperature, and we will reply with the model, a recommended working pressure and the lead time.
References
- ISO 1402:2021 — Rubber and plastics hoses and hose assemblies — Hydrostatic testing. Accessed 19 October 2026. Background on the hydrostatic test method behind burst figures.
- ISO 7751:2016 — Rubber and plastics hoses and hose assemblies — Ratios of proof and burst pressure to maximum working pressure. Accessed 19 October 2026. Background on how those ratios are set by hose service category.
Both are cited as background on how hose pressure ratings are defined and tested, not as evidence that our products are certified against either standard. If a project requires testing to a named standard, tell us and we will confirm what can be provided.
DongGuan Yutian Silicone Rubber Technology Co., Ltd — silicone extrusion manufacturer since 2012. 6,800 m² facility · 14 extrusion lines · 4 calendering lines · 7 compression moulding lines · Class 100,000 cleanroom · monthly capacity up to 8,000,000 meters. Room 801, Building 10, No. 2 Tutang Industrial 2nd Heng Road, Changping Town, Dongguan, Guangdong, China.
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