PMMA-FR
GB GB/T 7134-2008 Type 4
PMMA-FR is PMMA compounded with flame-retardant additives to meet building and rail fire-safety codes while keeping acrylic transparency, covered by GB/T 7134-2008 Type 4.
Reference datasheet — PMMA-FR is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CAST-FR condition
PMMA-FR grades and fills
PMMA-FR is supplied in 8 conditions, soft to hard. CAST-FR is the default FabDigit quotes; the values on this page are for it.
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact-modified FR | For FR glazing and covers that must survive handling/impact; trades stiffness, hardness and heat resistance for 2–4× notched impact. | 45 | 25 | 60 HRM | |
Low-smoke FR | Use when smoke density and toxicity limits (EN 45545 HL2, GB/T 8627) govern, not just ignition resistance. | 54 | 56 | 3 | 88 Shore D |
UL 94 V-0 grade | Pick when a V-0 listing at 1.5–3 mm is mandatory (electrical enclosures, rail interiors); accept lower clarity and toughness. | 55 | 3 | ||
Extruded FR sheet | Lower-cost FR sheet with tighter thickness tolerance and easier thermoforming/solvent bonding; slightly lower heat and solvent resistance than cast. | 58 | 60 | 4.5 | 86 Shore D |
Halogen-free FR | Choose for RoHS/REACH-sensitive rail, marine and electronics parts where halogenated FR and corrosive smoke are prohibited. | 58 | 60 | 3.5 | 87 Shore D |
UV-stabilized FR | Adds HALS/UV absorbers to offset yellowing of the FR package for exterior signage, canopies and skylights. | 61 | 64 | 4 | 88 Shore D |
UL 94 V-2 grade | Standard commercial FR acrylic where B1 / V-2 is sufficient and transparency must stay near virgin PMMA. | 63 | 66 | 4 | 88 Shore D |
CAST-FRDefault Cast FR sheet | Default choice for architectural glazing, partitions and signage that must pass B1 / UL 94 V-2 fire tests with high clarity. | 68 | 4.5 |
Supply forms, finishes and certifications
Ways PMMA-FR is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
IM-PELLET-FR | FR injection-molding pellet | Supply form |
What is PMMA-FR?
PMMA-FR is PMMA compounded with flame-retardant additives to meet building and rail fire-safety codes while keeping acrylic transparency, covered by GB/T 7134-2008 Type 4. Conditions on file include cast and extruded FR sheet, V0 and V2 ratings, halogen-free HFFR, low-smoke LS-FR, impact-modified IM-FR, UV-FR and FR moulding pellets; tensile strength is 68 MPa with 4.5 % elongation and a machinability score of 78. The additive package reduces clarity and thermal stability slightly and narrows the processing window, so keep melt residence time short. PMMA-FR has a density of 1.21 g/cm³ (0.0437 lb/in³), heavier than 60% of polymer grades. Its glass-transition temperature is 103°C (217 °F). PMMA-FR has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 68 MPa (9.86 ksi) — stronger than 72% of polymer grades. Elongation at break is 4.5% and the elastic modulus is 3.1 GPa (0.45 Msi).
What is PMMA-FR used for?
- Rail vehicle glazing
- Building interior panels
- Fire-rated signage
- Public transit windows
Advantages
- Polishes to a fine finish — 95/100, better than 98% of polymer grades
- Good UV / weathering resistance — 80/100, better than 86% of polymer grades
- Easy to machine — 78/100, better than 81% of polymer grades
Limitations
- Low fracture toughness — 1.1 MPa·√m (1 ksi·√in), worse than 82% of polymer grades
- Limited ductility — 4.5%, worse than 75% of polymer grades
PMMA-FR properties
Typical room-temperature values for PMMA-FR-CAST-FR; bars are the position among polymer grades.
Physical6
PMMA-FR has a density of 1.21 g/cm³ (0.0437 lb/in³), heavier than 60% of polymer grades. Its glass-transition temperature is 103°C (217 °F).
Mechanical16
PMMA-FR has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 68 MPa (9.86 ksi) — stronger than 72% of polymer grades. Elongation at break is 4.5% and the elastic modulus is 3.1 GPa (0.45 Msi).
Thermal11
PMMA-FR is rated for continuous service to 75°C (167 °F). It conducts heat at 0.19 W/m·K (0.11 BTU/hr·ft·°F), worse than 68% of polymer grades. Thermal expansion is 72 µm/m·K (40 µin/in·°F).
Electrical7
PMMA-FR is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 56% of polymer grades. UV resistance is very good.
Sustainability4
Producing a kilogram of PMMA-FR takes about 105 MJ of energy and emits 6.6 kg of CO₂ — more than 54% of polymer grades. Typical recycled content is 0%.
Manufacturability8
PMMA-FR's machinability is very good (78/100, better than 81% of polymer grades); weldability good (60/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. PMMA-FR is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PMMA-FR
Is PMMA-FR easy to machine?
Machines and laser-cuts cleanly with sharp positive-rake tools, high speed and low feed; anneal at 75–80 °C before and after machining to avoid crazing, and avoid coolants containing alcohols.
Can PMMA-FR be welded?
Not fusion-welded in practice — join by solvent cementing (methylene chloride/MMA syrup) or acrylic structural adhesives; hot-gas and ultrasonic welding possible but give lower-strength joints.
Can PMMA-FR be formed, bent or molded?
Thermoform sheet at 140–160 °C after drying 2–4 h at 80 °C; injection mold at 210–245 °C melt / 55–85 °C mold and keep residence time short so the flame retardant does not decompose and discolor.
PMMA-FR chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| flame retardant (organophosphate ester /type determines halogen-free vs halogenated variant | 4 – 18 | 10 |
| antimony trioxide (synergist, halogenateomitted in halogen-free grades | 0 – 3 | 1 |
| impact modifier (acrylic core-shell rubbimpact-modified variants only | 0 – 15 | 0 |
| UV absorber / HALS, processing aids | 0.1 – 1 | 0.4 |
| poly(methyl methacrylate) (MMA units)base resin; cast grades may include small methyl acrylate comonomer | ≥ 80 (balance) |
What surface finishes work on PMMA-FR?
Flame- or diamond-polish edges for optical clarity; can be screen-printed, hard-coated for abrasion resistance or vacuum-metallized — avoid solvent-based cleaners that craze the surface.
Equivalent designations
Standards and trade names that resolve to PMMA-FR in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- GB/T 7134-2008 Type 4
How much does PMMA-FR cost?
PMMA-FR is a premium-cost polymer ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
PMMA-FR — frequently asked
What is PMMA-FR used for?
PMMA-FR is typically used for rail vehicle glazing, building interior panels, fire-rated signage and public transit windows. In short: fire-rated acrylic sheet; V-0 and low-smoke options; narrow processing window.
What is the yield strength of PMMA-FR?
PMMA-FR has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 68 MPa (9.86 ksi) — stronger than 72% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is PMMA-FR easy to machine?
Yes — machinability is rated very good (78/100, better than 81% of polymer grades). Machines and laser-cuts cleanly with sharp positive-rake tools, high speed and low feed; anneal at 75–80 °C before and after machining to avoid crazing, and avoid coolants containing alcohols.
Can PMMA-FR be welded?
Yes — weldability is rated good (60/100). Not fusion-welded in practice — join by solvent cementing (methylene chloride/MMA syrup) or acrylic structural adhesives; hot-gas and ultrasonic welding possible but give lower-strength joints.
What surface finishes work on PMMA-FR?
Flame- or diamond-polish edges for optical clarity; can be screen-printed, hard-coated for abrasion resistance or vacuum-metallized — avoid solvent-based cleaners that craze the surface.
Can PMMA-FR be formed, bent or molded?
Thermoform sheet at 140–160 °C after drying 2–4 h at 80 °C; injection mold at 210–245 °C melt / 55–85 °C mold and keep residence time short so the flame retardant does not decompose and discolor.
What is the maximum service temperature of PMMA-FR?
PMMA-FR is rated for continuous use to about 75°C (167 °F), and briefly to 95°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PMMA-FR CAST-FR and PMMA-FR LS-FR?
CAST-FR is the default condition — default choice for architectural glazing, partitions and signage that must pass B1 / UL 94 V-2 fire tests with high clarity. LS-FR: use when smoke density and toxicity limits (EN 45545 HL2, GB/T 8627) govern, not just ignition resistance. Yield strength is 62 MPa in CAST-FR versus 54 MPa in LS-FR.
How much does PMMA-FR cost?
PMMA-FR is a premium-cost polymer ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- UL 94 Tests for Flammability of Plastic Materials — UL Solutions (2021)
- ISO 4589-2 Determination of burning behaviour by oxygen index — ISO (2017)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- CAMPUS plastics datasheets — PMMA (ISO 10350 property set) — CWFG (2024)
- Cast and extruded flame-retardant acrylic sheet technical data — Röhm / Mitsubishi Chemical / Chinese sheet producers (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.