Four grading systems cover almost every tender we see, and they do not translate into each other cleanly. Here is how to read the clause, and when paying for the higher grade is the cheaper decision.
The film grade is fixed by the standard your road authority applies and by the position of the sign on the road — not by what the supplier has in stock. In practice: Gulf and US highway work is specified at Type IV or above, European work at RA2, Central Asian work under GOST usually lands between Type III and Type IV, and low-volume roads in Africa and Southeast Asia are often Type I to III.
Reflective film is graded by measured retroreflection, not by brand or colour. Four systems cover almost every tender we see, and they are not interchangeable — a Type IV film is not automatically "RA2", even when the numbers are close, because the test geometry and the durability requirement differ.
ASTM D4956 (United States, and the de-facto language of the Gulf) grades film Type I to Type XI. EN 12899-1 (Europe) uses RA1, RA2 and RA3 performance classes plus a separate durability class. GOST 32945 and GOST R 52290 (Russia, Kazakhstan, Uzbekistan and neighbours) define retroreflective types by application. GB/T 18833 (China) uses classes I to V, where class IV and V are microprismatic.
| Type | Construction | Typical service life | Where it is specified | Cost index |
|---|---|---|---|---|
| I | Glass bead, engineering grade | 5–7 years | Low-volume and rural roads, temporary works | 100 |
| II | Super-engineering bead | 7–10 years | Legacy US specs, some municipal work | 120 |
| III | High-intensity bead | 7–10 years | Regulatory signs on secondary roads | 150 |
| IV | Microprismatic, high intensity | 10–12 years | US highway work, GCC arterial roads | 200 |
| VIII | Microprismatic, higher efficiency | 10–12 years | GCC and Asian highway programmes | 250 |
| IX | Microprismatic, very high intensity | 12+ years | Overhead and gantry signs, wide observation angle | 280 |
| XI | Microprismatic, highest grade | 12–15 years | Gulf motorways, prestige and tunnel projects | 330 |
Cost index is indicative, normalised to Type I = 100 per square metre of film. Service life is the manufacturer's durability class, not a warranty — read the warranty separately, it is usually shorter.
Film is roughly a fifth to a third of the cost of a finished sign. Moving from Type I to Type IV raises the film cost by around half, which raises the finished sign by perhaps twelve to eighteen per cent — while roughly doubling the interval before the sign has to be replaced. Over a fifteen-year road programme the Type IV sign is the cheaper object, and it is the one that still reads at 300 metres in year nine.
The exception is a genuinely temporary installation, or a market where the sign will be stolen or replaced by a widening scheme before it fades. In that case buy Type I and spend the difference on thicker blanks.
We supply YEAGOOD film as their agent and we apply it in-house, so we can quote a blank with film, or film alone in rolls. We do not claim that every grade is stocked: tell us the class your standard requires and we will confirm the exact product, its datasheet number and its delivery window in writing before you commit.
Close in performance, not equivalent in procurement. RA2 is defined by EN 12899-1 with its own test geometry and durability class; a film certified to Type IV may or may not hold an EN 12899-1 certificate. If the tender says EN 12899-1, ask for the EN test report, not the ASTM one.
Type VIII or XI, on 2–3 mm 5052-H38 blank, with the back of the panel coated to reduce heat build-up. High ambient temperature and UV load shorten the life of bead film dramatically, which is why the Gulf skipped straight to microprismatic.
Yes, and it is common: Type XI on the large gantry faces and Type IV on the smaller warning signs of the same project. They are cut from different rolls but applied on the same line, so the order stays one shipment.
Specification questions are answered by the same person who quotes the job.