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EJOT says three decades of installation experience, archived performance information and ongoing testing help it monitor and develop Colorfast. That supports a careful account of how field experience informs the range; it does not amount to a publicly disclosed independent study proving every performance promise. EJOT’s public pages describe the evidence it uses, but do not publish the number of installations, a complete test protocol, or quantified long-term colour-retention and corrosion results.
For specifiers and building owners, the key distinction is between a manufacturer’s accumulated evidence and independently verifiable outcome data. Here is what EJOT says it has learned, what it tests, and what the available information does—and does not—establish.
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What is EJOT Colorfast?
Colorfast is EJOT’s range of self-drilling fasteners with over-moulded, colour-matched nylon heads, intended for metal roofing and cladding applications. EJOT says it introduced the concept in the UK in 1993; the range is now in its third generation. The design offers an alternative to painted fastener heads and separate cover caps, combining a coloured head with a fastener intended for fixing building-envelope materials. EJOT’s 30-year retrospective describes the range’s history, while its Colorfast hub sets out current product information.
The product is a system of options, not one universal screw. EJOT describes a variety of self-drilling fasteners for envelope applications, including organically coated carbon-steel and stainless or bi-metallic variants, with different head and washer options. The appropriate selection depends on the substrate, assembly, exposure conditions and specification. A colour match alone does not establish that a particular fastener is suitable for a particular roof or wall.
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What does “thirty years of real-life data” mean?
In EJOT’s account, the phrase refers to several kinds of information gathered over time: archived performance data from existing installations, ongoing quality checks, application testing—including work for original equipment manufacturers (OEMs)—and feedback from OEMs, building owners and installers. EJOT says it uses these sources to monitor performance, substantiate its own test results and inform future product modifications. It describes some feedback as anecdotal. Its technical-focus page explains this approach.
That is a manufacturer-held evidence base assembled from field experience and testing. It is not the same as a published, independently analysed longitudinal study. The public pages reviewed do not disclose how many installations are in the archive, where they are located, what climate or exposure conditions they experienced, or how their colour change was assessed. They also do not provide statistical results, a full laboratory protocol, or a quantified failure or corrosion rate.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThose omissions matter when interpreting the word “confirmed” in the headline claim. EJOT’s account indicates that field information is part of its product-development and monitoring process. The material made public does not let readers independently calculate a long-term colour-retention rate or conclude that every installation, variant or environment will produce the same result.
What testing does EJOT describe?
EJOT says it regularly recalibrates tests for its coloured-plastics range. Its described checks include exposing over-moulded heads to UV light in cabinets to assess colour stability, and torsional checks of the head to assess torque transmission. EJOT also says testing needs regular recalibration because permitted chemical compositions for coloured plastics change. The public descriptions outline the types of work, but do not supply numerical colour-change results or a complete method that readers could reproduce. The retrospective and technical explanation describe these activities.
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UV exposure and torque checks address different questions. UV testing concerns the coloured plastic’s response to light exposure; torsional checks concern how the head transmits force during driving. Neither description, on its own, provides a quantified prediction of how a given installed fastener will look or perform after a specified number of years. To make that connection, readers would need details of the conditions, measurement method and relationship between the test and real installations—information the pages do not fully publish.
Does 1,000 hours of testing equal 40 years outdoors?
Not as a general rule. EJOT gives 1,000-hour test conditions calibrated to replicate 40 years of real-time performance as an example of how archived installation data can inform its test conditions. That is EJOT’s description of its calibration approach, not a universal conversion from laboratory hours to outdoor service life.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe technical page does not explain the specific exposure settings, climate assumptions, correlation model or validation needed to apply that example broadly. It should not be read as an independent certification, a guarantee of 40 years of service, or a formula that applies to any product, location or installation. The careful takeaway is that EJOT says it uses field data to help calibrate accelerated testing—not that the public evidence establishes an exact service-life equivalence for every Colorfast fastener. See EJOT’s explanation of its technical focus.
What does the design claim—and what remains unproven?
EJOT says the over-moulded head is designed to encapsulate the metal head and support secure driving. The bi-hex drive is intended to transmit torque and promote uniform compression of the washer. These are design aims described by the manufacturer, not quantified comparative results published in the sources reviewed.
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EJOT also contrasts the over-moulded head with painted fastener heads, whose coatings it says can be damaged during installation. The company says its long-term installation information helps it monitor exposure and corrosion performance. However, the available pages do not give a controlled comparison showing corrosion rates for Colorfast versus painted heads, nor do they establish a universal corrosion-resistance guarantee. Corrosion suitability still depends on selecting the right fastener material and assembly for the exposure and project requirements.
In practice, compare fixing options against the actual installation conditions rather than treating head appearance as a proxy for performance. Relevant factors include the risk of surface damage during installation, the required sealing and washer compression, colour and UV evidence, fastener material, corrosion environment, and whether the exact fastener is approved for the specified assembly. The available information supports describing EJOT’s design rationale; it does not support claiming superiority on every comparison point.
What does FM Approval cover?
EJOT reports that FM Approvals approved key or widely used Colorfast products for use in specified sandwich-panel or built-up envelope systems. EJOT presents this as independent verification against requirements for fully tested systems. The approval is relevant to the listed product and assembly scope; it should not be extended to every fastener in the range or to installations outside the approved assembly.
Before relying on an approval for a current specification, check the current FM Approvals RoofNav listing and the project’s system documentation. Confirm that the product, system build-up and intended use match the approval. The EJOT approval announcement identifies the company’s claim and quotes Brian Mack, Technical Business Development Manager at EJOT UK, describing approval for key products as an additional assurance about performance in application. That statement is about the value of approval; it is not independent evidence for the separate claim about thirty years of field data.
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What do the sales and colour figures tell you?
EJOT’s figures point to the range’s history and reported adoption, but they should not be mistaken for test results. The company’s retrospective says “640 million screws sold” across the UK and export markets and cites 26 million in 2022 alone. Its current hub page says “more than 650 million products used.” Those statements use different wording and appear in different company materials; without a dated reconciliation, they should not be treated as directly comparable or as proof of colour retention, corrosion performance or service life. The retrospective and the hub provide the respective figures.
The colour count also appears in more than one form. The retrospective says the original UK range had about 50 colours and describes nearly 400 available thirty years later; elsewhere it refers to regular recalibration and testing of 382 colour combinations. These are the page’s distinct descriptions, not a single verified current catalogue count. Check EJOT’s current catalogue for the colour and product options available for a project.
What should a project team verify before specifying Colorfast?
Use EJOT’s field-data account as context for the manufacturer’s development process, not as a substitute for project-specific selection or documentation. Before specifying a fastener, confirm the following with EJOT or the envelope-system manufacturer:
- Exact product: the fastener type and dimensions required for the application.
- Substrate and assembly: the material being fixed and the roof or wall system in which the fastener will be used.
- Fastener material: whether the specified steel type and coating suit the project’s exposure conditions.
- Washer and head: the configuration required for the intended fixing and sealing details.
- Colour: the current colour option and its match to the project materials.
- Approval scope: whether the precise product and assembly are included in any approval relevant to the project.
If long-term colour or corrosion performance is a critical acceptance criterion, ask for the relevant product-specific evidence and test details. EJOT’s public descriptions establish that it says field information and testing inform its work; the reviewed sources do not provide quantified outcomes sufficient to answer every project-specific performance question.
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What is the fairest conclusion?
EJOT’s thirty-year account is meaningful as a description of accumulated installation experience feeding into ongoing checks and product development. It is not public proof, by itself, that every performance promise has been independently confirmed across all Colorfast products and conditions. The company describes UV and torsional testing, archived installation information and qualitative feedback, while leaving important details—such as archive size, full test methods and quantified long-term results—undisclosed on the pages reviewed.
For construction professionals, the useful distinction is straightforward: treat the field-data claim as EJOT’s account of its evidence and development process; treat product suitability and approval as specific to the selected fastener and assembly; and seek current, product-specific documentation where a project requires measurable performance evidence.
Frequently Asked Questions
Can I specify a Colorfast screw by colour alone?
No. Colour identifies only one part of the selection. The fastener dimensions, material, substrate, washer and assembly requirements must also suit the project; confirm the current product details with EJOT or the envelope-system manufacturer.
Where can I check whether a particular Colorfast product has FM Approval?
Check the current FM Approvals RoofNav listing and the project system documentation, then match the listed product and assembly to the proposed installation. EJOT’s announcement is useful background, but an announcement is not a substitute for checking the current listing.
Do the reported sales figures show how long a Colorfast fastener will last?
No. Sales or use-volume figures describe reported adoption, not measured durability. They do not provide a service-life estimate or quantify colour retention or corrosion performance.
