Cal-Royal C-440 Silicone Adhes...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$27.02
$17.32
Cal-Royal Cal-Royal C-440 Silicone Adhesive Weatherstrips CAL-C-440

Cal-Royal C-440 Silicone Adhesive Weatherstrip for Wood or Hollow Metal Frames

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Model: C-440B-17
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$27.02
$17.32
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Cal-Royal C-440 Silicone Adhesive Weatherstrip for Wood or Hollow Metal Frames

The Cal-Royal C-440 Silicone Adhesive Weatherstrip is engineered and tested for durability and reliable performance, delivering an energy-efficient door seal that restricts air, light, smoke, and insects from around the opening. Designed for tighter frames, the C-440 demonstrates extremely low closing forces and begins compressing at 5/16", making it ideal for wood or hollow metal frame applications. Constructed from Silicone Rubber with 3M Adhesive Tape, this weatherstrip is rated for high-temperature performance between -58°F and 450°F, ensuring consistent sealing performance across demanding commercial environments.

Key Features

  • Low Closing Force Design: Engineered for tighter frames, the C-440 begins compressing at 5/16" for smooth, easy door operation.
  • High-Temperature Rated Material: Silicone Rubber construction with 3M Adhesive Tape handles various applications and high temperatures effective between -58°F and 450°F.
  • Strong Self-Adhesive Backing: High-quality self-adhesive with strong initial adhesion and long-term holding power for a secure, lasting bond.
  • Simple, Cost-Effective Sealing: Provides a straightforward and economical way to create a reliable seal around your door frame.
  • Non-Toxic and Self-Extinguishing: Resistant to sunlight, ozone, oxidation, weather, water, and flames for long-term performance and safety.
  • Mildew and Fungus Resistant: Impermeable to mildew and fungus and will not degenerate under normal exposure conditions.
  • Frame Versatility: Suitable for use on both wood and hollow metal door frames, offering flexible installation options.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Astragals, Gaskets and Weatherstripping
  • Product Type: Weatherstripping
  • Subcategory: Gaskets & Weatherstripping
  • Commercial/Residential: Commercial
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Cal-Royal C-440?

Cal-Royal C-440 weatherstripping delivers professional-grade sealing performance with silicone rubber construction rated for extreme temperature ranges between -58°F and 450°F. Its resistance to sunlight, ozone, oxidation, weather, water, flames, mildew, and fungus makes it a dependable choice for demanding commercial door openings where consistent, long-term sealing performance is essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Weatherstripping
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Cal-Royal C-440B-17 – Frequently Asked Questions

1) Will Cal-Royal C-440 weatherstrip work on a hollow metal door frame, or is it only for wood?
Both. The C-440 silicone adhesive weatherstrip is made for wood and hollow metal door frames, and it sticks on with 3M adhesive tape rather than screws or a kerf, so there is no routing or drilling in either case. That makes it a common choice for retrofitting existing openings where you don't want to cut the frame.
2) My doors are hard to close after adding weatherstrip. Is there a silicone seal with a lower closing force?
That's the situation the C-440 is built for. It's designed for tighter frames and starts compressing at 5/16 inch, with very low closing force, so the door still latches without a fight. If your existing seal is a bulky bulb or foam that the door has to crush, the C-440 silicone is the swap that usually fixes the latching complaint.
3) Can weatherstrip be used near an oven, boiler room, or other high heat door?
The C-440 is silicone rubber rated from -58 F to 450 F, which is well past what neoprene or foam seals handle. That range covers mechanical rooms, boiler rooms, kitchen and equipment areas, and it also covers exterior openings in hard winter climates at the cold end. It's also self-extinguishing and resistant to sunlight, ozone, oxidation, water, and flame.
4) What is a direct alternative to the Cal-Royal C-440 adhesive weatherstrip for a smoke and draft opening?
The Hager 726S is a smoke seal weatherstrip that installs press-on, the same adhesive-style application as the Cal-Royal C-440 silicone adhesive weatherstrip. Both are surface-applied seals that need no kerf cut and no screws into the frame, so on a wood or hollow metal frame either one goes on without machining. The C-440 is silicone rubber with 3M adhesive tape rated -58 degrees F to 450 degrees F; the 726S comes in a charcoal finish, where the C-440 comes in black and white.
5) The frame on my door is already kerfed. Should I still use the Cal-Royal C-440?
No. The C-440 is a silicone adhesive weatherstrip that bonds to the face of a wood or hollow metal frame with 3M adhesive tape. For a frame that already has a kerf cut in it, the Pemko Q103W is a kerf-in foam weatherstrip with an extended flange, 1-1/4 inch by 3/16 inch, and it is fire rated. The Q103W pushes into the existing kerf rather than sticking to the stop face, so a kerfed frame takes it without any prep at all.
6) My frame gap varies down the jamb. Is the C-440 the right seal?
The C-440 is built for tighter frames, begins compressing at 5/16 inch and shows extremely low closing forces, so it suits an opening with a consistent, small gap. Where the gap wanders and the seal needs to be dialed in, the Hager 864S is an 84 inch clear anodized aluminum adjustable jamb weatherstrip with a neoprene insert, and the adjustment lets the insert be set out to meet an inconsistent door edge.
7) Does Cal-Royal C-440 need screws, or does it just stick on?
It sticks on. The C-440 has a self-adhesive 3M tape backing with strong initial grab and long-term holding, so installation is clean the frame, peel, press. Nothing else is required to hang it. If your frame is kerfed and you'd rather have a seal that keys into the slot instead of adhering to the face, a kerf-in product like the Pemko Q103W Series is the other route.
8) Which is better for my opening, adhesive silicone weatherstrip or an aluminum jamb weatherstrip with a neoprene insert?
Different installs. The C-440 is a silicone strip that adheres directly to the frame face with 3M tape, no fasteners, no mounting extrusion, and it handles -58 F to 450 F. An aluminum-carrier product like the Hager 864S, an adjustable jamb weatherstrip in clear anodized aluminum with a neoprene insert, screws to the jamb and lets you adjust the seal in or out against the door as it wears or as the door sags. Pick the adhesive silicone for fast retrofits and heat, and the aluminum carrier when you want an adjustable, mechanically fastened seal you can re-tension later.
9) Will Cal-Royal C-440 weatherstrip stop smoke and light around a door?
The C-440 seals against air, light, smoke, and insects around the opening, which is what a property manager is usually after on a corridor or tenant door. Note it is sold as a perimeter seal for wood and hollow metal frames. If your opening is a rated assembly and you specifically need a fire-rated product on the door top or a rated kerf seal, the Pemko 68 fire-rated door top weatherstrip and the Pemko Q103W fire-rated kerf-in are the products carrying that designation.
10) Is the Hager 862S the same kind of seal as the Cal-Royal C-440?
They are not interchangeable in how they mount. The Hager 862S is a 48 inch weatherstrip with a neoprene insert for smoke and draft control, meaning the seal rides in a carrier that fastens to the frame. The Cal-Royal C-440 is silicone rubber on 3M adhesive tape that sticks directly to the frame face with no carrier and no fasteners. The 862S is a fixed 48 inch piece; the C-440 comes in 17, 20, 25, 204 and 510 inch lengths, so a long jamb run can be done from one piece of C-440 rather than joined sections.
11) Which weatherstrip matches an aluminum storefront look rather than a painted frame?
The Hager 864S is a clear anodized aluminum adjustable jamb weatherstrip, 84 inches with a neoprene insert, so its carrier reads as bright aluminum against a storefront frame. The Cal-Royal C-440 silicone adhesive weatherstrip is offered in black and white, which suits a painted wood or hollow metal frame where the seal is meant to disappear into the stop.
12) Do I need a separate part for the head of the door, or does the C-440 cover it?
The C-440 is a silicone adhesive weatherstrip for wood or hollow metal door frames and runs on head and jambs alike, with lengths up to 510 inches for continuous coverage around an opening. If a dedicated head seal is what the drawing calls out, the Pemko 68 is a fire-rated door top weatherstrip supplied at 40 inches with a black sponge neoprene insert, sized for the head alone.
13) For standardizing weatherstrip across a building, what is the difference between neoprene and the C-440?
The Hager 862S, Hager 864S and Pemko 68 all seal with a neoprene insert. The Cal-Royal C-440 seals with silicone rubber on 3M adhesive tape, rated -58 degrees F to 450 degrees F and described as resistant to sunlight, ozone, oxidation, weather, water, mildew and fungus. On a facility with mixed openings, the neoprene-insert products carry their seal in a mounted carrier while the C-440 is applied straight to the frame, which is the practical split when writing one standard across doors that have and have not been prepped.
14) What color options does Cal-Royal C-440 come in for matching dark bronze or painted white frames?
Black and white, and both are offered across all five lengths (17, 20, 25, 204, and 510 inches). Black reads correctly against dark bronze, anodized, and factory dark frames; white matches painted white wood and hollow metal jambs. If you're standardizing a building, order one color across the whole run so the openings match.
15) Will silicone adhesive weatherstrip hold up in a humid basement or exterior opening without mildew?
Silicone rubber doesn't feed mildew or fungus, and the C-440 is impermeable to both and won't degrade under normal exposure. Add resistance to sunlight, ozone, oxidation, weather, and water and it holds up on exterior and damp interior openings where a foam seal would crumble or stain.
16) Is Cal-Royal C-440 a commercial-duty weatherstrip or a residential product?
Commercial. Cal-Royal lists the C-440 as a commercial product, and it's used on office buildings, schools, healthcare, retail, industrial and warehouse space, multi-tenant residential, and government buildings. The silicone material and the -58 F to 450 F range are why it goes where a hardware-store foam strip won't last.
How fast can I get the Cal-Royal C-440B-17 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Cal-Royal C-440B-17 come with a warranty?
Absolutely. The Cal-Royal C-440B-17 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Cal-Royal C-440B-17?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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