WRWeatherstrip ReferenceWeatherstrip profile identification by shape & measurements
Source-bounded identification · Schlegel references

Schlegel Q-LON foam or brush pile? Identify the sliding contact before buying

Short answer. Schlegel offers distinct weatherseal technologies: composite Q-LON foam, woven/extruded polypropylene brush pile, and separate solid extruded…

Short answer. Schlegel offers distinct weatherseal technologies: composite Q-LON foam, woven/extruded polypropylene brush pile, and separate solid extruded families [F15]. They should not be compared as if every seal worked by compressing an identical hollow bulb. The first useful question on a sliding window or patio door is where the seal touches, how it moves and what retains it, not which product photograph looks closest.

Two different constructions

Q-LON foam: Manufacturer identifies a polyurethane foam body covered with a polyethylene film, with attachment/reinforcement forms depending on product [F01]. Some Schlegel Q-LON pages mention a lower-friction liner for sliding applications; this still does not identify a complete sliding-door replacement.

Brush pile: Schlegel states its brush pile uses polypropylene fibres; in different configurations it uses woven or extruded backings, optional fins and silicone-treated yarn for moisture management [F13]. For combination brush pile, Schlegel describes carrier options such as rigid ABS, polypropylene and PVC-U, while the yarn remains PP [F14]. Therefore “silicone-treated” need not mean the whole seal is molded silicone rubber. Neither “PP carrier” nor “PU foam” confirms your frame system.

Diagnose by location and evidence

Inspect Q-LON-like continuous foam Brush-pile-like contact
Contact face Enclosed continuous compressible body and film Visible bristles/yarn; optional thin fin among fibres
Attachment Kerf, surface or other type depending on actual SKU Woven base, extruded carrier, channel or other product-specific retention
Working motion to document Which face compresses when the sash shuts? Which edge sweeps/slides past the fibres?
Essential measurement Body height plus original backing/groove details Fibre height, backing width, fin presence plus carrier slot
Missing-fit question Does the OEM service drawing specify this compression section? Does the OEM service drawing specify this exact pile and retention profile?

None of these observations establishes that a brush strip may be substituted for a foam seal, or that a sliding sash with multiple seal positions should have only one material. An opening may have distinct perimeter, meeting-stile, track and screen components. If more than one is present, label each by location before comparing replacement product families.

Five photos a parts counter can actually use

  1. A whole interior view with fixed and sliding members marked; show which panel moves.
  2. A close-up of each joint where you see a seal; assign letters A, B and C so different components do not become one question.
  3. A side view of visible brush fibres/fins or continuous film body without bending old material into a new shape.
  4. The retaining slot, base or kerf viewed directly, showing orientation; any frame number or model plate separately.
  5. A ruler beside an already-detached original offcut if available; otherwise say “dimensions not available without disassembly.”

Then ask the product/frame manufacturer: Is this a primary air seal, meeting-stile brush, glazing seal or screen insect strip? What current service code corresponds to this exact position and manufacture date? Which pile fibre height, backing and fin option or foam profile drawing is specified? Is a different retention method allowed? Request written installation evidence instead of inferring fit from “sliding door” marketing.

When “no exact fit confirmed” is the right answer

If the catalogue shows PP yarn and a silicone-treated option but the installed part’s height or base is unknown, you can responsibly identify the material family yet still have no verified model match. Likewise a clean photo of a Q-LON foam dome does not reveal hidden reinforcement or groove engagement. Collect the missing record rather than forcing a similar product into a moving track. For bind/drag complaints, do not disable catches, stops or required-exit function to test improvised seals.

Primary manufacturer sources

Continue researching