PPR polypropylene socket-fusion fittings and metal-insert adapters, dn 20–110 mm

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PPR fittings (random copolymer polypropylene) join the pipe by socket fusion: the heating tool at 260 ±10 °C (DVS 2207-11) melts the pipe outside and the fitting inside simultaneously, and both solidify as a single piece. This sheet covers the 41 references of the family: socket-fusion figures dn 20–110 mm, threaded metal-insert adapters 1/2″–4″, flange kit 32–160 mm, clamps and a branch saddle.

SKU VT-59283 (90° socket-fusion elbow) · family of 41 socket-fusion polypropylene, metal-insert and fixing references · price from $800 COP + VAT per unit depending on figure and size (Jul 2026, confirmed on quotation)

1. Technical specifications

General specifications

Product	Family of random copolymer polypropylene (PP-R) fittings for socket-fusion joining, in three subfamilies: fusion figures (24 references), adapters with an embedded threaded metal insert (13 references) and fixing and branching elements (4 references) — 41 references in total.
Joint type	Heated-tool socket fusion per DVS 2207-11, up to dn 110 mm with the parameters of section 2. Transitions to metal thread via embedded insert; demountable joints via union fittings (up to 63 mm) or the flange kit/stub end (32–160 mm).
Size range	dn 20 to 110 mm in fusion figures (per figure); metal inserts 1/2″ to 4″; flange kit 32 to 160 mm.
Body material	Random copolymer polypropylene (PP-R). The catalog offers the main fusion figures in a GREEN and a BLUE line (same figure and size; the exact compound specification per color is confirmed on quotation). The allowable system pressure by temperature and service life is a pipe datum: see data sheet FT-TC-TUB-PPR-001.
Metal insert	Female or male metal thread embedded in the fitting molding (not press-fitted afterwards): the transition between the fused network and threaded taps, valves, meters and equipment. Insert alloy, plating and thread pattern (NPT or BSP) are confirmed on quotation per lot.
Applicable standards	DVS 2207-11 (heated-tool welding of PP: temperature, depths and times) · EN ISO 15874-1 and 15874-3 (plastics piping systems for hot and cold water — part 3: fittings) · NTC 4897 parts 1-3:2017 (Colombian adoption of ISO 15874) · DIN 16962 series (pipe joints and elements for polypropylene pressure pipelines: fitting dimensions) · DIN 8077/8078 (the pipe — see FT-TC-TUB-PPR-001).

Catalog dimensional coverage by figure — fusion fittings

Threaded metal-insert adapters and fixing elements

Nominal mm ↔ inch equivalence of the PPR system

PPR is designated by its actual outside diameter in millimeters (dn); the inch is only the commercial nominal equivalence used to order threaded transitions:

The center-to-end (z) and socket dimensions of each figure belong to the system manufacturer's catalog, dimensioned to the DIN 16962 series, and are confirmed on quotation per figure and size. The fusion-socket insertion depth — the dimension that governs assembly — is tabulated by diameter in section 2.

2. Socket fusion by diameter: temperature, depth and times (DVS 2207-11)

In socket fusion there is no gasket, thread or adhesive to age: the heating tool melts the pipe outside and the fitting inside at the same time, the molten layers interlock on joining and solidify as a single piece — fusion makes the system monolithic, and in a well-executed network the joint is not the weak point. The whole procedure comes down to three numbers per diameter: insertion depth, heating time, and joining and cooling times.

250 °C or 260 °C? The figure that governs PPR

The heating tool temperature for PPR is 260 ±10 °C (250–270 °C range), set by DVS 2207-11, the heated-tool welding standard for polypropylene. The 250 °C figure circulating in field tables and social media comes from ASTM F2620 — the practice for polyethylene (PE), with the heater at 490–510 °F (254–266 °C) — and sits at the lower end of the DVS range, so the two figures do not contradict each other; but the standard for this family's material is DVS 2207-11: set the welder to 260 °C and verify the actual socket-face temperature with a contact thermometer before the first joint (the temperature displayed by the tool is internal and usually differs from the surface temperature).

Socket fusion table by diameter (DVS 2207-11)

Heating tool at 260 ±10 °C. Times and depths per DVS 2207-11 and the system manufacturer's fusion manual (concordant with the factory setting of PP-R socket welders). The heating time counts from the moment pipe and fitting reach the insertion depth, not from when they start entering; with ambient temperature below +5 °C the heating time increases ~50%. The exact times and depths of the actual tool govern over this table: confirm them in the welder's manual.

The four execution rules

1. Prepare: square, burr-free cut; clean pipe and socket faces; mark the insertion depth from the table on the pipe before heating.
2. Heat: push pipe and fitting into the heater sockets simultaneously up to the mark and count the heating time from that instant.
3. Join: remove and join immediately, pushing axially up to the mark without rotating the parts; alignment can only be corrected within the joining time (4–10 s depending on size).
4. Cool: hold still and unloaded during the cooling time; from 75 mm a bench machine with alignment jig is required — at those sizes manual assembly no longer controls coaxiality.

The allowable system pressure by temperature and service life (PN per service class, ISO 9080 regression curves) is a pipe datum and lives in data sheet FT-TC-TUB-PPR-001 — PPR PN16 pipe, together with thermal expansion and supports: this sheet does not duplicate those values.

3. Fusion errors by name: how a joint fails and how to avoid it

Every failure mode of a socket-fusion joint has a name, a cause and a prevention — and all are avoided with the table in section 2:

Visual acceptance rule: a correct joint shows a continuous, uniform ring of material around the whole socket mouth, with the pipe inserted to the mark. A missing, discontinuous or inward-overflowing ring signals a badly executed cycle.

4. Metal inserts: the transition from the fused network to the thread

The metal-insert adapter is the hybrid that connects the fused network to the threaded world: taps, angle valves, meters and water heaters. One end is a PPR fusion socket; the other is a metal thread embedded in the fitting molding — the plastic is injected around the insert, which stays mechanically anchored and cannot rotate or pull out. The catalog covers 13 insert figures: female adapters 1/2″–4″ and male, elbows, tees, unions (fusion × thread, demountable) and branch saddles with threaded outlet up to 110×32×1″.

Why a metal insert and not a thread cut in the plastic

The metal thread takes the make-up torque and the connect-disconnect cycles that a thread molded in PP does not tolerate: at the transition to a metal element (nipple, angle valve, tap connector) repeated tightening plus polypropylene creep deform the plastic thread over time. Hence this family's specification rule: molded plastic thread only against plastic thread or low-demand connections; every transition to metal, with a metal insert.

Assembly rules on the insert

• Thread sealant: PTFE tape (2-3 turns in the thread direction) or a polypropylene-compatible sealant. Do not use aggressive anaerobic sealants in contact with the plastic body without confirming chemical compatibility.
• Tighten on the metal, not on the plastic: wrench on the hex or metal surface of the insert/connected part — never lever on the PPR body or use it as a backup nut.
• Tightening torque: firm hand-tight plus wrench adjustment until sealed, without excess. The system manufacturer does not publish a maximum torque in Nm: the allowable torque of the supplied lot's insert is confirmed on quotation.
• Thread pattern: verify the counterpart pattern (NPT or BSP) before installing — mixing patterns engages few threads and drips. The lot's insert pattern is confirmed on quotation.
• Site sequence: fuse the PPR end first (with the section 2 cycle) and thread afterwards — threading first subjects the fresh fusion joint to torsion during cooling.

5. Demountable joints: unions, flange kit and stub end — and the welder

A fused network is permanent by design: where dismantling is required — valves, equipment, meters, maintenance — one of these three elements is specified:

Union fittings	In-line demountable joint with a center nut. Fusion × fusion union 20–63 mm, male-male 1/2″–1″ and metal-insert unions (fusion × thread) 20×1/2″ to 63×2″ — the typical solution at angle valves and small equipment.
Stub end (fusion collar)	PPR collar fused to the pipe that receives a sliding backing flange; available 1″–6″. It is the sealing face on the plastic side.
Flange kit with union	Stub end + flange set for coupling to flanged valves (butterfly, gate) and equipment, 32–160 mm — the only element of the family that goes beyond the dn 110 socket-fusion limit.

Selection criterion: up to 63 mm dismantling is solved with a union; from 63 mm up, and always at flanged valves or counter-flanged equipment, specify stub end + flange. Branching off an existing line without cutting it is solved with the fusion saddle (50–160/250 mm), the insert saddle or the mechanical tapping saddle (25×1/2″ to 110×2″).

Associated tool: socket-fusion welder

Everything in section 2 is executed with a socket welder with per-diameter sockets. The TECTUL catalog includes the digital PPR welder 20–63 mm (digital temperature control — setting 260 °C and verifying it is the first requirement of the fusion table), with interchangeable sockets per diameter. For dn 75–110 mm a bench machine with alignment jig is used, available on quotation.

6. Frequently asked questions

How long is a 25 mm (3/4″) PPR fitting heated?

7 seconds of heating, at most 4 seconds of joining and 2 minutes of cooling, with the tool at 260 ±10 °C and a 15.0 mm insertion depth (DVS 2207-11). Time counts from when pipe and fitting reach the bottom of the sockets; below +5 °C ambient the heating rises to 11 s. The full 20–110 mm table is in section 2.

What temperature is the welder set to for PPR?

260 °C, with a ±10 °C tolerance (250–270 °C range), per DVS 2207-11 — the heated-tool welding standard for polypropylene. The 250 °C figure circulating in field tables comes from ASTM F2620, which is the polyethylene practice (heater 490–510 °F / 254–266 °C), and sits at the lower end of the DVS range. Verify the actual socket-face temperature with a contact thermometer: the one the tool displays is internal.

Is the fused joint weaker than the pipe?

No: a correct joint forms a continuous piece of the same material, with a combined socket-plus-spigot thickness greater than the pipe wall — that is why a well-fused PPR network does not have its weak point at the joints. That result depends on executing the full cycle of section 2; the failure modes (cold joint, overheating, rotation) are in section 3.

What happens if I heat PPR longer than indicated?

The excess molten material flows inward on joining and forms a ring that permanently reduces the inside diameter: the joint does not drip, but it throttles the flow. It is the most common and most invisible error — detectable only by cutting the joint open or measuring the pressure loss of the run. The antidote is counting time from full insertion and never "playing safe" with extra seconds.

How is a PPR network connected to a metal valve or tap?

With a metal-insert adapter (embedded female or male thread, 1/2″–4″ in the catalog) for threaded connections, or with the flange kit/stub end (32–160 mm) for flanged valves and equipment. The thread molded in the plastic itself is reserved for low-demand transitions; tightening is always done on the metal — the full rules are in section 4.

How is an already-installed PPR line branched?

With a fusion saddle (fused onto the pipe, 50 to 160/250 mm, outlets 20–40 mm), an insert saddle (threaded outlet 1/2″–1″) or the supra mechanical tapping saddle (25×1/2″ to 110×2″) when fusing is not possible. The fused saddle keeps the system monolithic; the tapping saddle is mechanical and demountable.

7. Application notes

8. Technical notice and limitation of liability