1.Product introduction of pc led light diffuser.
We design tooling and manufacture pc led light diffuser, PC extrusion profile, PC cover, PMMA light diffuser, PMMA extrusion profile, ABS extrusion profile, PVC profile, PE, PP profile, ASA profile etc. PC diffuser is a light weight replacement for glass. This energy saving and durable products are sells very well at Asia, Europe and USA. Any standard size or OEM sizes are available.
2.Product specification of pc led light diffuser.
| Item | Specification |
|---|---|
| Resin | Optical-grade polycarbonate. Standard extrusion grade PC E2000; flame-retardant grade 616LS where a fire rating is specified; 2805 general-purpose grade where cost is the driver. Grade named on your quotation and order confirmation. |
| Form supplied | Extruded profile / cover, cut to length. Section width from a few mm to 500 mm. |
| Wall thickness | Set by the die and quoted against your drawing - not a stock range. Reference build: model WT303-ALP045, 46 mm wide × 1.3 mm wall, 0.08 kg/m. Send a drawing or a sample section for a thickness and weight figure on your geometry. |
| Dimensional tolerance | ±0.3 mm |
| Cutting tolerance | ±0.5 mm |
| Unit weight | Quoted in kg/m for every profile, so you can cost by metre or by weight |
| Length | Cut to your required length |
| Light transmission | 70 / 75 / 80 / 85 / 90 / 92 % - specified per order |
| Finish | Clear · Opal · Satin (frosted) · Striped · Lens · two different finishes on the same profile |
| Operating temperature | −60 °C to +120 °C |
| Impact | ≈200× glass, ≈30× PMMA (Izod notched, ISO 180 / ASTM D256) |
| Tooling | In-house die shop - every extrusion die designed and cut by our own engineers |
| MOQ | From 1,000 m, depending on specification |
| Lead time | 7 – 15 days on repeat and standard orders |
| Compliance documents | RoHS 2011/65/EU as amended by (EU) 2015/863 (10 substances) · REACH SVHC declaration · raw-material test reports - see Section 7.4 |
A note on flame rating
A UL 94 rating belongs to a resin at a tested thickness and colour, not to a product. The same compound can reach V-0 at 1.5 mm and only V-2 at 0.8 mm, and a colourant change can invalidate a rating. Clear PC generally needs ≥3 mm for V-0, while opal and milky PC can reach V-0 from around 1.5 mm. If your luminaire approval needs a specific rating, tell us the rating and the wall thickness at enquiry stage and we will quote the flame-retardant grade that carries it, with the resin maker's UL documentation for that grade and wall. For how finish, wall thickness and UL94 rating interact across the whole diffuser range, see our guide to LED diffuser cover types, light transmission and material selection.
Extruded Profile or Cut-to-Size Plate - Which to Specify
Buyers searching "PC diffuser plate" and "PC diffuser sheet" are after two different things. A plate or sheet is cut from stock and dropped into an existing frame. An extruded profile is drawn through a die matched to your fixture, so the diffuser, the light-blocking edge and the snap-fit can be one part. We extrude profiles for linear lights, cabinet lights, office luminaires and step lights - sections from a few mm to 500 mm wide.
| Decision factor | Extruded profile (this product) | Cut-to-size flat plate |
|---|---|---|
| Existing fixture, flat opening | No advantage | Better - no tooling |
| Curved, lipped or snap-fit geometry | Only option - formed in the die | Needs thermoforming or a separate retainer |
| Volume | Justifies a die from 1,000 m upward | Any volume |
| Consistency across a long run | Held to ±0.3 mm in-line, every metre | Sheet tolerance, then cut |
| Continuous linear runs over 2 m | Better - end joints designed into the section | Butt joints read as bright or dark lines |
| Assembly labour | One part, clips in | Diffuser + retainer + fasteners |
| Time to first delivery | Longer on a new die, 7–15 days once cut | Shorter |
Material choice: PC vs PMMA vs PS
| Property | PC (polycarbonate) | PMMA (acrylic) | PS (polystyrene) |
|---|---|---|---|
| Light transmission | 70 – 92 % | 80 – 92 % | 70 – 88 % |
| Impact (Izod, notched) | ≈200× glass | ≈17× glass, brittle at edges | Lowest - cracks on clip insertion |
| Continuous service temp | −60 to +120 °C | ≤80 °C | ≤70 °C |
| Linear expansion | ≈65 µm/m·K | ≈75 µm/m·K | ≈70 µm/m·K |
| Flame behaviour | V-2 to V-0 depending on thickness and grade | Flammable | Flammable |
| Yellowing under non-LED (UV) sources | Needs UV protection | Better bare UV resistance | Poor |
| Relative material cost | Baseline | Higher | Lower |
| Choose it when | Impact, heat or a fire rating matters; snap-fit sections | Maximum clarity, no impact or fire requirement | Cost-driven flat indoor panels at low temperature |
PS is the cheapest of the three and a legitimate choice for flat indoor panel diffusers at low fixture temperatures - we extrude PS profiles as well. It is the wrong choice for anything that clips, flexes, sits close to a driver, or faces a fire-rating requirement. For a deeper breakdown of transmittance, heat resistance and flame behaviour between the two dominant diffuser resins, see our PMMA vs polycarbonate LED diffuser materials comparison.
Four failure modes we see on returned diffuser profiles
- No expansion allowance on runs over 2 m. PC expands roughly 65 µm per metre per °C. A 3 m run seeing a 40 °C rise from ambient to steady-state fixture temperature grows about 8 mm. Clamped at both ends, it bows out of the channel within days of first switch-on. Leave about 3 mm per metre at one end, or specify a section with a sliding end joint.
- Snap-fit dimensioned to nominal instead of to tolerance. A clip drawn to the nominal wall with no allowance fits the first sample and then rattles or splits across a production batch. We quote clip geometry against the ±0.3 mm profile tolerance - cheaper to argue about 0.1 mm at drawing stage than to recut a die.
- Alkaline or solvent cleaning after installation. PC held under bending stress in a clip crazes on contact with ammonia-based or alkaline cleaners - fine cracks along the clip line appearing after weeks, not immediately. Specify neutral-pH cleaning in your installation sheet.
- A non-LED source behind a standard diffusion grade. Standard diffusion PC assumes an LED source emitting no UV. Behind fluorescent or metal-halide sources it yellows measurably within the first couple of years. Those builds need UV protection specified at the die, not added later.
3.Product features and application of pc led light diffuser.
Features: With a light transmittance reaching 85%–92%, it reduces energy consumption, enhances fixture illuminance, and promotes energy efficiency and environmental sustainability. It maintains consistent color rendering properties of the light source, minimizes chromatic deviation, and faithfully reproduces the true colors of objects. Additionally, it effectively reduces optical interference, preserves the original photometric distribution curve of the fixture, and ensures optimal lighting performance.Superior heat-stability, Superior light diffusion, UV resistant, impact resistant, heat resistant, flame retardant, low weight, ROHS compliant, both frosted and smooth finishing are available.
pc light diffuser plate vs. traditional diffusing materials
| Performance Indicator | PC Light Diffusion Plate | Acrylic Diffusion Plate | Ordinary Frosted Glass |
|---|---|---|---|
| Light Transmittance | Excellent 85%–92% | Good 80%–88% | Fair 70%–85% |
| Light Uniformity | Excellent Extremely uniform | Good Good uniformity | Fair Average uniformity |
| Impact Resistance | Excellent 200 times that of glass | Fair Fragile | Poor Very fragile |
| Weather Resistance | Excellent UV-resistant, yellowing-resistant | Fair Prone to yellowing | Good Stable |
| Flame Retardant Grade | Excellent UL94 V0/V2 | Fair Flammable | Excellent Non-flammable |
4.Applications: the PC led light diffuser can be used for led lighting and luminary cover.
- What's your company advantage for PC led light diffuser?
- We can extrude almost all plastic material
- Our PC diffuser is with high clarity and good light transmission.
- We can extrude both very big plastic profile.(from 2mm to 500mm section profile)
- We can meet you big order and fast delivery requirements.
- We can provide customer with good quality and reasonable price products.(ISO9001:2008 quality system)
- Browse our full custom LED light diffuser profile range to find a stock cross-section or start a custom drawing.
5.Latest news.
We have developed new PC diffusers with different surface finishing on the same product.
6.Product pictures:
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Clear and milky PC led light diffuser for T8 LED light |
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Pc led light diffuser for led linear light |
7. Ordering Terms: MOQ, Tooling, Lead Time and Documentation
7.1 MOQ and lead time
| Terms | |
|---|---|
| MOQ | From 1,000 m, depending on specification |
| Lead time, standard and repeat orders | 7 – 15 days |
| Samples | Free samples available for testing; send a drawing for a sample consultation |
| Capacity behind the quote | 65 extrusion lines (45 large-scale, 20 small-scale) across 16,000 m², 300+ staff, 2,000 tonnes of profile per year, three processing centres in Guangzhou, Shanghai and Beijing |
7.2 Tooling: what actually decides whether a custom section is worth it
Our die shop is in-house and every extrusion die is designed and cut by our own engineers, from a drawing in any format. See our engineering breakdown of extrusion die design principles, tolerances and tool life for what actually drives a die's service life and total cost of ownership. Three things are worth knowing before you compare quotes:
- Tooling is a one-time charge, not a per-order charge. It is amortised across your first order and disappears from every order after that, which is why the die cost - not the per-metre price - is what decides whether a custom section makes sense at your annual volume.
- The die may already exist. We hold a large library of lighting sections from 20+ years of extruding for this industry. Send a drawing or a 100 mm piece of your current part and we will tell you whether an existing die fits before quoting any tooling at all.
- The die stays available for your repeat orders. Ask about exclusivity if the section is proprietary to your fixture.
7.3 Price basis
Extruded diffuser profiles are quoted per metre, derived from section width × wall thickness × resin density - which is why we publish weight in kg/m for every profile and why a drawing gets you a real price instead of a catalogue range. Two consequences: shaving 0.2 mm off the wall of a wide profile moves material cost noticeably, and moving from 85 % to 92 % transmission changes the resin, not a machine setting.
7.4 Documents we can issue
- Certificate of Compliance per shipment
- RoHS declaration citing 2011/65/EU as amended by (EU) 2015/863 - 10 restricted substances
- REACH SVHC declaration (current on file: 33rd Candidate List, 16 January 2025; re-declaration against the latest list on request - the list was updated to 253 entries in February 2026 and again in June 2026)
- Raw-material test reports, including: 2023_ROHS_PA-707K · PC Environmental Declaration · Dongguan Tianchen raw-material report covering phthalates (5P/6P/7P), California Prop 65 lead, Prop 65 6P, REACH SVHC and EU RoHS 10 · VH001-REACH-2025 · Yuanjinhui RoHS 2 · Yuanjinhui PAHS test report
- Resin grade confirmation (PC E2000 / 616LS / 2805 as ordered)
- Dimensional inspection against ±0.3 mm profile and ±0.5 mm cut tolerance
If you file to the EU SCIP database, ask for the SVHC declaration at enquiry stage rather than at shipment - it is the document that most often holds up a first delivery.