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Reference · UPVC 806 · Dimensions

uPVC Pipe Sizes in mm — What We Make, and What the Table Cannot Tell You

The metric range we actually manufacture, with the catalogue wall thickness for every one of the nine sizes we make, and a clear statement of where the range stops.

Read This Before You Read Any UPVC Size Chart

UPVC pressure pipe is designated in millimetres, and the millimetre number on the pipe is the real outside diameter. That part is simple. Everything downstream of it is not, and the reason is that the metric UPVC world and the inch UPVC world are two separate product families that were never designed to meet. A “4 inch” UPVC pipe from a North American merchant is 114.30 mm across the outside. The nearest metric size, dn 110, is 110 mm. They are 4.30 mm apart, which is more than enough to make one pipe useless in the other’s socket.

This page is a list of the things that actually go wrong when you size UPVC in millimetres, built around the standard that governs it — EN ISO 1452-2 — and around our own manufactured range, which runs Φ20 × 2.0 to Φ110 × 7.2 mm in nine sizes, each with its catalogue wall thickness listed in item 10. The general theory of why DN, NPS and metric dn do not convert into each other is set out in our pipe sizing charts reference and is not repeated here. What follows is specific to this one product line: which millimetre sizes exist in the standard, what the wall thickness number means on a UPVC pipe (it is not what most buyers assume), and the one discontinuity in ISO 1452-2 that sits precisely at the top of our range and catches people every time.

Eleven items. The first four are dimensional facts you can look up. Items five through eight are the traps. The last three are about our range specifically and where it stops.

1. The Millimetre Sizes That Exist Are a Fixed List, and 100 Is Not On It

UPVC 806 pipe on the cutting line — the Φ20–Φ110 range covered by this table
UPVC 806 pipe on the cutting line — the Φ20–Φ110 range covered by this table

UPVC pressure pipe diameters are not a continuum. EN ISO 1452-2 publishes a closed series of nominal outside diameters and clause 6.2 makes it mandatory: “The nominal outside diameter, dn, of a pipe shall conform to Table 1″ (ISO 1452-2:2009(E), clause 6.2). The full series in millimetres is:

12, 16, 20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800, 900, 1000 (ISO 1452-2:2009(E), Table 1).

Read that list for what is missing rather than what is present. There is no 100 mm. No 150. No 30, no 60, no 80, no 120. Those are the numbers a buyer reaches for instinctively because they are round, and none of them is a UPVC pressure pipe size. The series climbs 63, 75, 90, 110, 125 — a geometric-ish progression that looks arbitrary until you notice it is the same metric thermoplastics series used across the plastics standards, originating in ISO 161-1 rather than being invented for PVC (ISO 4065:1996(E), clause 4, which directs the reader to ISO 161-1 for the diameter basis).

In our experience the single most common enquiry error on UPVC is a bill of quantities specifying “100 mm UPVC”. It is not a size. The writer usually means either dn 110 metric, or DN 100 in the steel sense (which would be 114.3 mm OD in steel), or nominal 4 inch ASTM (114.30 mm). Three different pipes. We cannot guess which, and guessing wrong costs a container.

2. The Wall Thickness Number Is a Minimum, Not an Average — This Changes How You Inspect

This is the item that most often surprises engineers coming from metals, and it is worth more than the one line it usually gets.

On a UPVC pressure pipe to ISO 1452-2, the nominal wall thickness en is not a target value with symmetric tolerance either side. It is the floor. Clause 6.4 states: “The nominal wall thickness, en, is classified with the pipe series S. The nominal wall thickness corresponds to the minimum allowable wall thickness.” The standard’s wall table is titled, unambiguously, “Nominal (minimum) wall thicknesses” (ISO 1452-2:2009(E), clause 6.4 and Table 2).

The tolerance table confirms it by being one-sided. Every entry in ISO 1452-2 Table 3, “Tolerance on wall thicknesses at any point”, is expressed as +0,x with no negative half: for en over 1,0 up to 2,0 mm the tolerance is +0,4 mm; over 2,0–3,0 mm it is +0,5; over 3,0–4,0 mm it is +0,6; over 4,0–5,0 mm it is +0,7 (ISO 1452-2:2009(E), Table 3). At the heavy end the same pattern holds — over 21,0–22,0 mm gives +2,4 mm, and over 24,0–25,0 mm gives +2,7 mm.

Nominal wall en (mm)Permitted toleranceAcceptable measured range (mm)Is under-nominal acceptable?
> 1,0 to 2,0+0,4 / −0en to en + 0,4No
> 2,0 to 3,0+0,5 / −0en to en + 0,5No
> 3,0 to 4,0+0,6 / −0en to en + 0,6No
> 4,0 to 5,0+0,7 / −0en to en + 0,7No
> 21,0 to 22,0+2,4 / −0en to en + 2,4No
> 24,0 to 25,0+2,7 / −0en to en + 2,7No

Tolerance values from ISO 1452-2:2009(E), Table 3. Intermediate rows of Table 3 exist between 5,0 and 21,0 mm; only the rows we read directly from the standard text are reproduced above, and the gap is not interpolated.

Two practical consequences. First, on incoming inspection, a single point measuring below nominal is a rejection — there is no “within tolerance on the low side” for wall on this standard. Second, a pipe measuring above nominal wall is conforming, not over-engineered and not a substitute for a higher class. A Φ110 PN 10 pipe with nominal 4,2 mm that measures 4,6 mm at one point is still a PN 10 pipe. It is not PN 12,5 (which requires 5,3 mm nominal at that diameter — ISO 1452-2:2009(E), Table 2). Buyers occasionally try to argue the upgrade. The class is what the manufacturer declares against the series, not what a caliper finds at one spot.

3. Outside Diameter Tolerance Grows With Size, and the Grade Changes at 50 mm

The OD tolerance in ISO 1452-2 is also one-sided positive, and it widens as the pipe gets bigger. From Table 1, the tolerance on mean outside diameter dem:

Nominal outside diameter dn (mm)Tolerance on mean ODTolerance grade (ISO 11922-1)
12 to 50+0,2 mmGrade D
63 to 90+0,3 mmGrade C
110+0,4 mmGrade C
125+0,4 mmGrade C
160+0,5 mmGrade C
200+0,6 mmGrade C
315+1,0 mmGrade C
630+1,9 mmGrade C
710 to 1000+2,0 mmGrade C

All values from ISO 1452-2:2009(E), Table 1. Per footnote a to that table, the tolerance conforms to grade D of ISO 11922-1 for dn ≤ 50 mm and grade C for dn > 50 mm. Table 1 contains rows for every diameter in the series; the above are the rows read directly from the standard text, and values for the diameters between them are not interpolated here.

The grade switch at 50 mm is the detail worth carrying away. Small pipe is held to a tighter class of tolerance than large pipe — not merely a smaller number of millimetres, but a different specified grade. If you are writing an inspection protocol that applies one blanket OD tolerance across a mixed-diameter delivery, it will be wrong at one end or the other.

4. Out-of-Roundness Is a Separate Requirement, and Thin-Wall Pipe Gets a Looser One

A pipe can pass mean-OD inspection and still be oval. ISO 1452-2 handles this with a distinct out-of-roundness limit, defined as de,max − de,min in a cross-section, and — this is the part that catches people — the limit depends on which pipe series the pipe belongs to (ISO 1452-2:2009(E), Table 1).

dn (mm)Out-of-roundness limit, series S 20 to S 16 (thinner wall)Out-of-roundness limit, series S 12,5 to S 5 (thicker wall)
1102,2 mm1,4 mm
1603,2 mm2,0 mm
3157,6 mm3,8 mm

Values from ISO 1452-2:2009(E), Table 1. The logic is physical: a thin-walled low-pressure pipe deforms more readily under its own weight and during coiling or stacking, so the standard concedes more ovality to it.

There is a timing qualifier on both columns that is easy to miss and matters commercially. Per the footnotes to Table 1, for series S 20 to S 16 the out-of-roundness requirement applies only prior to storage, and for series S 12,5 to S 5 it applies only prior to the pipe leaving the manufacturer’s premises (ISO 1452-2:2009(E), Table 1, footnotes b, c and d). In other words, the standard does not guarantee roundness at the point of delivery after a sea freight leg and a period in a yard. If ovality at destination is contractually important to you, it has to be written into the contract, because ISO 1452-2 does not do it for you. That is our reading of the clause, offered as commercial experience rather than as a standards interpretation you should rely on without your own legal review.

5. The Trap: SDR 13,6 Is PN 16 on Small Pipe and PN 20 on Large Pipe

This is the most important item on the page, and it is not general sizing theory — it is a specific discontinuity inside ISO 1452-2 that applies to UPVC and lands exactly where our product range ends.

The relationship between pipe series S and SDR is fixed and universal. ISO 1452-2 Table 2 maps them: S 20 = SDR 41, S 16 = SDR 33, S 12,5 = SDR 26, S 10 = SDR 21, S 8 = SDR 17, S 6,3 = SDR 13,6, S 5 = SDR 11 (ISO 1452-2:2009(E), Table 2 column headers). That mapping never changes; it follows from S = (SDR − 1) / 2 (ISO 4065:1996(E), clause 3.6).

The mapping from SDR to pressure class does change. ISO 1452-2 Table 2 is split into two sub-tables with different design coefficients:

  • For dn 12 to 90 mm, the table is headed “Nominal pressure PN based on design coefficient C = 2,5”.
  • For dn 110 to 1000 mm, the table is headed “Nominal pressure PN based on design coefficient C = 2,0”.

(ISO 1452-2:2009(E), Table 2, both sub-tables.) The consequence, laid out side by side:

Pipe series SSDRPN for dn 12–90 mm (C = 2,5)PN for dn 110–1000 mm (C = 2,0)Same SDR, same class?
S 2041Not listed in this rangePN 6
S 1633PN 6PN 8No
S 12,526PN 8PN 10No
S 1021PN 10PN 12,5No
S 817PN 12,5PN 16No
S 6,313,6PN 16PN 20No
S 511PN 20PN 25No

All pairings from ISO 1452-2:2009(E), Table 2. Every row differs by one pressure step.

Say it plainly: SDR 13,6 UPVC is PN 16 if the pipe is 90 mm or smaller, and PN 20 if the pipe is 110 mm or larger. And conversely, if you want PN 16 at dn 110 or above, you need SDR 17 (S 8), not SDR 13,6. A purchase order reading “UPVC SDR 13,6 PN 16” is internally consistent at Φ90 and internally contradictory at Φ110 — at Φ110 that SDR is a PN 20 pipe, and the buyer has either over-specified the wall or mis-stated the class.

The standard anticipates the confusion and provides a rule for people who want the conservative coefficient throughout. Footnote a to Table 2 states: “To apply a design coefficient of 2,5 (instead of 2,0) for pipes with nominal diameters above 90 mm, the next higher pressure rating, PN, shall be chosen” (ISO 1452-2:2009(E), Table 2, footnote a). So a C = 2,5 basis at Φ110 and above is obtained by stepping up one class, which is exactly the one-step offset visible in the table columns.

Why this matters for us in particular: our UPVC range is Φ20 to Φ110 (per our catalogue). The break point sits between Φ90 and Φ110 — inside our range, at the last size. The two largest diameters we make are governed by different design coefficients. Any customer building a size-to-class table across our whole range from a single SDR assumption will get the Φ110 line wrong.

Note also that the underlying pressure derivation, the meaning of PN as a designation, and temperature derating are treated generally in our sizing reference; the point here is narrower and specific to UPVC — that the SDR-to-PN map on this one material is two-valued, and the split is at 110 mm.

6. The Wall Thickness Table, Read Across Both Design Coefficients

Here are the ISO 1452-2 nominal (minimum) wall thicknesses for the diameters in and around our range. The small-diameter block is on C = 2,5 and the Φ110 block is on C = 2,0, so the PN headings differ between the two tables — that is not a typographical inconsistency, it is item 5 in table form.

Small diameters, dn 12–90 mm, C = 2,5. Nominal (minimum) wall in mm:

dn (mm)PN 6 (S 16)PN 8 (S 12,5)PN 10 (S 10)PN 12,5 (S 8)PN 16 (S 6,3)PN 20 (S 5)
201,51,9
251,51,92,3
321,51,61,92,42,9
632,02,53,03,84,75,8
752,32,93,64,55,66,8
902,83,54,35,46,78,2

Larger diameters, dn 110 mm and above, C = 2,0. Note the PN headings have shifted by one class for the same S/SDR. Nominal (minimum) wall in mm:

dn (mm)PN 6 (S 20 / SDR 41)PN 8 (S 16 / SDR 33)PN 10 (S 12,5 / SDR 26)PN 12,5 (S 10 / SDR 21)PN 16 (S 8 / SDR 17)PN 20 (S 6,3 / SDR 13,6)PN 25 (S 5 / SDR 11)
1102,73,44,25,36,68,110,0
1253,13,94,86,07,49,211,4
1604,04,96,27,79,511,814,6
2004,96,27,79,611,914,718,2
2506,27,79,611,914,818,4
3157,79,712,115,018,723,2
4009,812,315,319,123,729,4
50012,315,319,123,929,736,8

All wall thickness values from ISO 1452-2:2009(E), Table 2. Both tables above reproduce only the diameter rows we read directly from the standard; rows for the intermediate diameters in the series exist in Table 2 and are deliberately not interpolated here. Dashes indicate combinations not listed in the source rows we read.

Three observations that are not obvious from a casual scan:

  • The heavy classes run out before the light ones do. PN 25 (S 5) stops at dn 200; PN 16 and PN 20 stop at dn 500; PN 12,5 continues to dn 630 (ISO 1452-2:2009(E), Table 2). High pressure and large diameter are not independently available — you cannot have both past a point, because the required wall becomes impractical.
  • 1,5 mm is the floor. The thinnest wall anywhere in Table 2 is 1,5 mm, appearing at dn 12 and 16 in series S 5 (ISO 1452-2:2009(E), Table 2). Below that the standard simply does not go, whatever the ratio arithmetic would suggest.
  • The walls are not PVC-specific. Note 1 to Table 2 states: “The nominal wall thicknesses conform to ISO 4065” — the universal thermoplastics wall thickness table. Note 2 adds that “The PN 6 values for S 20 and S 16 are calculated with the preferred number 6,3” (ISO 1452-2:2009(E), Table 2 notes). The geometry is shared across polymers; what makes it a UPVC table is the material strength and the design coefficient applied on top.

7. The Naming Trap: “4 Inch UPVC” Is a Different Pipe From Φ110

Metric UPVC and inch UPVC are both real, both standardised, and dimensionally incompatible. The inch family runs to ASTM D1785, whose Table 1 fixes outside diameters that are neither equal to the nominal inch number nor equal to anything in the ISO metric series:

Nominal size (NPS)Actual OD (in)Actual OD (mm)Nearest ISO 1452 metric dnDifference from that metric size
1/2″0.84021,34201,34 mm larger
3/4″1.05026,67251,67 mm larger
1″1.31533,40321,40 mm larger
1-1/4″1.66042,16402,16 mm larger
1-1/2″1.90048,26501,74 mm smaller
2″2.37560,32632,68 mm smaller
2-1/2″2.87573,02751,98 mm smaller
3″3.50088,90901,10 mm smaller
3-1/2″4.000101,60No metric counterpart
4″4.500114,301104,30 mm larger

Imperial outside diameters from ASTM D1785 (2012), Table 1, “Outside Diameters and Tolerances for PVC Plastic Pipe Schedules 40, 80, and 120″; millimetre conversions are arithmetic at 25,4 mm per inch. Metric series from ISO 1452-2:2009(E), Table 1. The Schedule 40 values in ASTM D1785 Table 1 are independently corroborated by a manufacturer datasheet listing the same figures — 1/2″ = 0.840 in, 2″ = 2.375 in, 2-1/2″ = 2.875 in, 3″ = 3.500 in, 4” = 4.500 in (Westlake Pipe & Fittings, ASTM D1785/D2665 Sch. 40 PVC datasheet).

Not one pair in that table matches. The closest is 3″ against Φ90, at 1,10 mm apart — close enough to look identical in a warehouse and far too far apart to solvent-weld reliably into each other’s sockets. The 4″ against Φ110 pair, which is the one people actually try to substitute, is 4,30 mm apart.

The imperial family also has its own tolerance regime, tighter in absolute terms and two-sided rather than one-sided. ASTM D1785 gives average OD tolerances of ±0.004 in (±0,10 mm) for NPS 1/8″ through 3/4″; ±0.005 in (±0,13 mm) for 1″ and 1-1/4″; ±0.006 in (±0,15 mm) for 1-1/2″ and 2″; ±0.007 in (±0,18 mm) for 2-1/2″; ±0.008 in (±0,20 mm) for 3″ and 3-1/2″; and ±0.009 in (±0,23 mm) for 4″ (ASTM D1785 (2012), Table 1). Compare that against the ISO 1452-2 figures in item 3 — +0,4 mm at dn 110, positive only. Two standards, two philosophies: ASTM centres the diameter within a band, ISO sets a floor and allows drift upward.

One thing we will not tell you, because we could not verify it: that any particular metric size is an approved substitute for any particular inch size. We looked for a standard endorsing such an equivalence mapping and did not find one. The dimensional data above shows the two systems are distinct; no source we could open licenses treating them as interchangeable. Treat any “metric to imperial UPVC equivalents” chart as a trade convenience, not a standards-derived conversion.

We should also be explicit about a limit of our own data here: we extracted outside diameters from ASTM D1785 Table 1, not wall thicknesses. If you need to compare a metric wall against a Schedule 40 or Schedule 80 wall, do not take those Schedule figures from this page — we have not verified them and are not going to print them.

8. Where the Millimetre Number Comes From, and What SDR Means on a UPVC Pipe

Brief, because the general treatment lives in our sizing reference and this is only the UPVC-specific application of it.

SDR is a pure geometric ratio: “standard dimension ratio, SDR: The ratio of the nominal outside diameter dn of a pipe to its nominal wall thickness en” (ISO 4065:1996(E), clause 3.5). Dimensionless. On UPVC there is a subtlety worth stating: because en is defined as the minimum wall (item 2), the SDR of a UPVC pipe computed from its nominal figures is the ratio at the thinnest permitted condition. A conforming pipe that runs above nominal wall has an actual dn/e ratio lower than its declared SDR. The declared SDR is a floor-condition descriptor, not a measurement you should expect a caliper to reproduce exactly.

You can verify the series-to-SDR mapping arithmetically. S = (SDR − 1) / 2, equivalently SDR = 2S + 1 (ISO 4065:1996(E), clause 3.6). Checking against the ISO 1452-2 headers: S 5 gives 2(5) + 1 = 11 ✓; S 8 gives 17 ✓; S 12,5 gives 26 ✓; S 20 gives 41 ✓. The pairs S 6,3 → 13,6 and S 16 → 33 are rounded preferred numbers rather than exact arithmetic — S values at or below 10 are taken from the R 10 series of preferred numbers and those above 10 from the R 20 series (ISO 4065:1996(E), clauses 3.6 and 4).

The wall thickness itself is calculated, per ISO 161-1, from either en = dn / ((2σ/p) + 1) or en = dn / (2S + 1), with σ the design stress and p the internal pressure expressed in the same units (ISO 4065:1996(E), clause 4). S can also be read as the ratio of design stress to maximum allowable operating pressure: S = σs / PMS. ISO 4065 states the applicable range as maximum allowable operating pressures between 2,5 and 25 bar and design stresses between 2,5 and 16 MPa (ISO 4065:1996(E), clauses 3.6 and 4).

A warning about that formula. It is tempting to use it to fill in the wall thickness of any size you like. Do not treat the result as product data. A computed wall is what a standard would require, not what a given factory manufactures or declares — those are different claims, and the second one has to come from the manufacturer. Our own per-size walls in item 10 are the declared catalogue figures, not formula output, and item 10 shows one size where the two would not have agreed.

9. What ISO 1452-2 Actually Covers — and the Temperature Ceiling

Worth knowing before you specify against it. The scope of ISO 1452-2 is narrower than “PVC pipe”: clause 1 states it “specifies pipes for the conveyance of water and waste water up to and including 45 °C”, covering solid-wall PVC-U pipes for water supply and for buried and above-ground drainage and sewerage under pressure. The material is required to have a declared minimum required strength: “The pipe material shall have a minimum required strength, MRS, as defined in ISO 1452-1:2009, 4.4.1” (ISO 1452-2:2009(E), clauses 1 and 4).

The 45 °C figure is the standard’s own scope limit and is the number to design against when you are working to ISO 1452. Our catalogue separately describes the UPVC/CPVC 806 system as offering heat resistance of 95–120 °C. Read that attribution carefully: in the catalogue the heat-resistance description belongs to the CPVC side of the 806 system, and it should not be quoted as a rating for UPVC pipe on its own. We are flagging rather than reconciling the difference: a material heat-resistance figure and a standard’s pressure-service scope limit are not the same kind of claim, and we do not have a temperature/pressure derating table for the 806 line to bridge them. That derating table is genuinely something we do not hold — ask and we will request it from the factory. Until then, design to the standard’s limit, not to the material figure.

Two further honesty notes on the standards position, because they affect how you should use the figures above:

  • Every wall thickness, tolerance and PN value on this page is from the 2009 edition of ISO 1452-2. We were unable to confirm whether a later edition supersedes it, or precisely which amendments the currently harmonised European version carries. Verify currency before quoting these figures as “current” in a contract document.
  • We were also unable to verify whether the older European EN 1452 (pre-2009) uses an identical diameter and wall-thickness series to EN ISO 1452. If your specification cites EN 1452 rather than EN ISO 1452, do not assume the tables are the same — we could not check, and we are not going to assert it.

10. Our Actual UPVC Range: All Nine Sizes, Φ20 × 2.0 to Φ110 × 7.2 mm

Everything above is the standard. This is what we make, size by size.

ItemDetail (per our catalogue)
SeriesUPVC 806, pipe reference WP55
Size rangeΦ20 × 2.0 mm to Φ110 × 7.2 mm
Pressure classPN16
Standard length4 m per length
Fittings1806 series, 203 items, including ball valves and solvent cement
JointingSolvent cement
Chemical / heatResists acids and alkalis; the catalogue’s 95–120 °C heat-resistance figure describes the UPVC/CPVC 806 system (see item 9)
Above Φ110Not manufactured on this line

All rows per our catalogue. Here is the wall thickness at every diameter we make — the complete nine-size table, not just the endpoints:

Outside diameter Φ (mm)Wall thickness (mm)Pressure classLength
202.0PN164 m
252.0PN164 m
322.4PN164 m
403.0PN164 m
503.7PN164 m
634.7PN164 m
755.6PN164 m
906.7PN164 m
1107.2PN164 m

All nine rows per our catalogue. Two things are worth reading off this table rather than assuming.

First, Φ20 and Φ25 share the same 2.0 mm wall. The wall does not step at every diameter — the catalogue holds 2.0 mm across the two smallest sizes, so the Φ25 pipe has a thicker wall relative to nothing and a higher SDR than Φ20. Anyone generating this table from a constant-SDR formula would have produced a different number for Φ25, which is exactly why the formula is not a substitute for the manufacturer’s declaration.

Second, the wall at Φ110 is 7.2 mm, and that is the size where ISO 1452-2 switches design coefficient (item 5). If your specification requires the pipe to be declared to a specific S or SDR class under EN ISO 1452-2, put that in the enquiry — matching our declared dimensions to the standard’s classification is the factory’s declaration to make in writing, not something to infer off a table.

11. Where the Range Stops, and What That Means for Your Enquiry

Φ110 is the ceiling for our UPVC pressure pipe (per our catalogue). Look back at the ISO 1452-2 series in item 1 and note how much of it sits above that line: 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800, 900, 1000 mm. We make none of it. If your bill of quantities is built around DN 150 to DN 400 distribution mains, we cannot supply that portion, and we would rather you knew that from this page than from the third email of a quotation round.

One clarification that we have to repeat every few weeks, and it has two parts. Our PVC 902 drainage line reaches Φ160 in the 1902 fittings only; the 902 pipe itself runs Φ32 to Φ110 (per our catalogue). So “902 up to 160” is wrong as usually stated — a Φ160 fitting exists, a Φ160 pipe does not. And the whole 902 line is non-pressure drainage, carrying no pressure rating whatsoever. It is not a Φ160 substitute for a pressure main, in any class, under any circumstances. The bigger number means a different duty, not more capability. Every time somebody scans a price list looking for “the 160”, both halves of this are the risk.

For completeness on the rest of our pressure range, with the walls stated: PPR is 20 × 2.8, 25 × 3.5 and 32 × 4.4 mm, in 4 m lengths, PN20 — three sizes, and 32 mm is a genuine range ceiling rather than a gap in our data. HDPE runs the same nine diameters as UPVC: Φ20 × 2.3, Φ25 × 2.3, Φ32 × 3.0, Φ40 × 3.7, Φ50 × 4.6, Φ63 × 5.8, Φ75 × 6.8, Φ90 × 8.2 and Φ110 × 10.0 mm, PN16, pipe marked “GERMANY STANDARD DIN8077/8078” (all per our catalogue).

Practically, our UPVC range covers terminal branches, riser take-offs, fixture and equipment connections, and small-diameter distribution. It does not cover primary or secondary distribution mains, transmission mains, or large-bore municipal work. If your enquiry spans both, split it: send us the portion at Φ110 and below and source the mains elsewhere.

Frequently Asked UPVC Size Questions

What are the standard UPVC pipe sizes in mm? Per EN ISO 1452-2, the nominal outside diameter series is 12, 16, 20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800, 900 and 1000 mm (ISO 1452-2:2009(E), Table 1). Clause 6.2 makes conformance to that list mandatory. Our own manufactured range within it is Φ20 to Φ110 (per our catalogue).

Is there a 100 mm UPVC pipe? No. 100 mm is not in the ISO 1452-2 diameter series (ISO 1452-2:2009(E), Table 1). Specifications asking for it usually mean dn 110 metric, or a 4″ ASTM pipe at 114,30 mm OD (ASTM D1785 (2012), Table 1). Those are two different pipes, so please state which.

Is Φ110 UPVC the same as 4 inch UPVC? No. 4″ to ASTM D1785 is 114.30 mm outside diameter; metric dn 110 is 110 mm. They are 4,30 mm apart and their fittings are not interchangeable. We found no standard endorsing an equivalence between the two systems.

Does the wall thickness on a UPVC pipe have a minus tolerance? No. The nominal wall thickness in ISO 1452-2 is the minimum allowable wall thickness (clause 6.4), and Table 3 tolerances are one-sided positive. A measurement below nominal at any point is non-conforming.

Is SDR 13,6 UPVC always PN 16? No, and this is the trap. It is PN 16 only for dn 12 to 90 mm, where Table 2 uses design coefficient C = 2,5. For dn 110 to 1000 mm the table uses C = 2,0 and SDR 13,6 becomes PN 20 — with PN 16 at those diameters requiring SDR 17 instead (ISO 1452-2:2009(E), Table 2).

What is the thinnest UPVC pressure pipe wall in the standard? 1,5 mm, at dn 12 and 16 in series S 5 (ISO 1452-2:2009(E), Table 2).

Can I get PN 25 UPVC in a large diameter? Not beyond dn 200 — PN 25 (S 5) stops there in Table 2, while PN 16 and PN 20 run to dn 500, while PN 12,5 continues to dn 630 (ISO 1452-2:2009(E), Table 2). And not from us in any diameter: our UPVC line is PN16 and stops at Φ110 (per our catalogue).

What temperature can UPVC pipe handle? ISO 1452-2 scopes itself to water and waste water “up to and including 45 °C” (clause 1). Our catalogue separately states heat resistance of 95–120 °C for the UPVC/CPVC 806 system, where that description belongs to the CPVC side — it is not a rating for UPVC pipe by itself. Those are different kinds of claim; design to the standard’s limit. We do not hold a temperature/pressure derating table for the 806 line; ask and we will request it from the factory.

What wall thickness is your Φ63 UPVC pipe? 4.7 mm, PN16, in 4 m lengths (per our catalogue). The full per-size table is in item 10: Φ20 × 2.0, Φ25 × 2.0, Φ32 × 2.4, Φ40 × 3.0, Φ50 × 3.7, Φ63 × 4.7, Φ75 × 5.6, Φ90 × 6.7 and Φ110 × 7.2 mm.

Do you supply DN 160 or DN 200 UPVC pressure pipe? No. Our UPVC pressure range ends at Φ110 (per our catalogue). Our PVC 902 drainage line reaches Φ160 in the 1902 fittings only — 902 pipe runs Φ32 to Φ110 — and the whole line is non-pressure drainage that must never be substituted for a pressure duty.

MOQ, lead time and pricing? Coming soon — quoted per enquiry.

Where is your UPVC pipe made? IFANNova is a French brand. Nothing in our range is made in France — manufacturing is by Zhuji Fengfan Piping Co., Ltd in Zhejiang, China (per our catalogue): 30+ years, 1000+ employees, exports to 118+ countries, 10,000 sets of moulds, 120,000 m² of plant. Certifications listed in our catalogue include SKZ, CE, WRAS, DVGW, SGS and ISO 9001/14001; certificate numbers and validity dates are Coming soon and sent against a specific enquiry.

Send Us the Sizes and Get a Written Answer

A diameter alone will not get you a usable quotation on UPVC. Send the outside diameter in millimetres (not a DN or inch label), the pressure class or SDR your specification requires, the service temperature, and the metres per size. You will get a written reply against our actual range — the per-size walls are on this page, and you will get a straight “no” where the size sits above our Φ110 ceiling rather than a quotation we cannot honour.

Where to Go Next

Related reading

More on Sizes & Reference.

All 49 technical resources UPVC 806 Pipe & Fittings