How Should NFPb200-1 and NFPb200-2 Be Selected According to Installation Space and Load-Bearing Conditions?

How Should NFPb200-1 and NFPb200-2 Be Selected According to Installation Space and Load-Bearing Conditions?

Select NFPb200-1 where the wall, substrate or suspended structure has little spare load capacity, or where the clear dimension cannot accept the thicker board. Select NFPb200-2 where the structure can carry the greater mass and the assembly needs that thicker board. NFPb200-1 is 2440 × 1220 × 6.0 mm, 2 mmPb, 25 kg/m² and 77 kg/sheet; NFPb200-2 is 2440 × 1220 × 10.0 mm, 2 mmPb, 37 kg/m² and 110 kg/sheet. Both are lead-free boards of a rare-earth shielding component compounded with a flame-retardant polymer, non-toxic, with Class A fire performance and a nano-polished decorative face. Thickness, areal weight and sheet mass are separate fields; a larger thickness is not, by itself, a higher shielding grade. Both models are specified at 2 mmPb. Use that nominal lead equivalence only with the tube voltage or beam quality, filtration, measurement geometry and the standard named in the attenuation report; the beam conditions for the 2 mmPb figure are those in the report. Because the nominal equivalence is the same, document the choice as structural and dimensional: attenuation from the report, load from the anchor and substrate calculation, and fire performance from the assembly that was actually tested.

Space and wall load decide the model only after the attenuation reports are shown to be comparable

Three inputs normally sit in front of this choice: the protection level the room assessment requires, the load the wall can still accept, and the thickness the opening or recess can still take. The protection level comes from the project shielding assessment under the applicable framework — for diagnostic rooms in China, GBZ 130-2020, read with the dose principles of GB 18871-2002; in US practice, the report structure of NCRP Report No. 147. Those documents are assessment frameworks, not a certificate for either board.

Once that assessment has fixed the required lead equivalence, NFPb200-1 and NFPb200-2 are not chosen by treating the thicker board as the higher grade. Both are specified at 2 mmPb. They are chosen by spare load and remaining clear dimension, and only if each board’s attenuation report supports that 2 mmPb under the project’s beam quality, filtration, geometry and standard. The beam conditions for the 2 mmPb figure are in the attenuation report. Narrow-beam and broad-beam results are not interchangeable, and a narrow-beam measurement is not the same thing as a narrow energy spectrum.

Extra dead load on a wall is the difference in areal weight times the wall area. Between these two models that difference is 12 kg/m² (37 − 25). That difference, not a copied detail from another room, is what the frame, fasteners and substrate must be shown to accept. Frame and fasteners are designed for the actual board weight.

Thickness and areal weight are separate fields, and the table is how they are compared on site

Areal weight and thickness stay in separate columns, with units. Do not convert one into the other with an assumed density, and do not import parameters from another product family.

Other build-ups sometimes placed in the same room are not drop-in substitutes. At the same 2 mmPb comparison point, traditional barium sulfate board is 70 kg/m² (30 mm in one comparison table, 24–30 mm in another), easy to break, a three-layer composite, and needs a secondary surface decoration; steel plate is 100 mm and 785 kg/m², extremely heavy, and needs a secondary surface decoration; traditional lead sheet is 2 mm and 25 kg/m², toxic, easy to deform, a five-layer composite, and needs a secondary surface decoration. The two boards are non-toxic, tough and not easy to break, installed as a single layer, and do not need a secondary surface decoration. Read any manufacturer comparison as a build-up comparison, keep each material’s thickness and areal weight in its own columns, and do not treat an untested stack as the assembly that was measured. Medical shielding cores are a different product family; their series parameters are not used for these boards (medical shielding core).

Eyewear and face screens are different products again. Their mass and lead equivalence are not interchangeable with either board or with the wall acrylic.

Load per square metre and per fastener is the calculation that decides which board a wall will accept

Panel mass is easy to mis-state in a submittal. Start from the panel field:

${\sigma }_A$ is areal weight in kg/m², $A_{\mathrm{s}\mathrm{h}\mathrm{e}\mathrm{e}\mathrm{t}}$ is sheet area in m², and $k_f$ is a dimensionless project allowance for adhesive, frame and fasteners. Define that allowance once so the same items are not added again as a separate line. Then share the gravity load across the fasteners that are actually in the load path:

with $g=9.81\mathrm{m}/{\mathrm{s}}^2$, $n$ the number of effective fasteners, and ${\gamma }_L$ the load factor from the structural code or the project specification — not from the panel datasheet. $F_{\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{h}\mathrm{o}\mathrm{r}}$ is a force in newtons. The check is $F_{\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{h}\mathrm{o}\mathrm{r}}\le R_d$ only when $R_d$, the design resistance of the anchor in the actual substrate, is in the same unit.

This equal share is a screening estimate, not a code design. It does not cover eccentricity, prying, combined shear and tension, or loads during lifting. On a wall, self-weight is primarily shear at the anchors; on a soffit, primarily tension. Use the resistance that matches that direction and that substrate.

For the standard sheets, ${\sigma }_A$ is 25 kg/m² (NFPb200-1) or 37 kg/m² (NFPb200-2), sheet size is 2440 × 1220 mm, and catalogue sheet mass is 77 kg or 110 kg. Catalogue sheet mass and the product of areal weight and sheet area are not fully consistent. Do not average them and do not size the lift or the anchors on either figure alone; use the delivered weight. The areal-weight gap is what changes crew, lifting gear, fastener demand and the substrate survey. Those consequences appear at installation, not as a property of the purchase order line.

The installed build-up, not the board alone, consumes space

All three terms are lengths. $t_{\mathrm{p}\mathrm{a}\mathrm{n}\mathrm{e}\mathrm{l}}$ is 6.0 mm for NFPb200-1 and 10.0 mm for NFPb200-2. Where the board is fixed to a frame, the cavity and the finish usually dominate the build-up, so the 4.0 mm thickness difference between the two models may be small beside the frame. Where the board is bonded or clipped to a flat substrate, that thickness difference is the term that decides whether the clear dimension still works. A factory decorative face is part of the board: deep walnut grain, light walnut grain or light oak grain, nano-polished, and stated separately from the core. Do not add that face again as a site finish. Frame layout for the ordered model is: a 40 × 60 mm rectangular tube installed longitudinally every 400 mm; corner codes every 500 mm vertically, staggered, to fix and adjust horizontal flatness; and transverse rectangular tubes for later board reinforcement. That layout is a construction method, not a structural verification for every substrate. The board may be bonded with adhesive or hung with clips on the substrate; frame and fasteners are designed for the actual board weight.

A purchase order should fix size, model, finish and fastening before any board is cut

Name the model, NFPb200-1 or NFPb200-2. State the lead equivalence as 2 mmPb and the beam quality, filtration, geometry and standard under which it was determined, as given in the attenuation report. State the standard size 2440 × 1220 × 6.0 mm or 2440 × 1220 × 10.0 mm, any cut sizes, and the edge condition. Choose the decorative finish from deep walnut grain, light walnut grain or light oak grain, and state it separately from the core. State whether the board is bonded or hung, and on what substrate. Give the frame layout — 40 × 60 mm rectangular tube longitudinally every 400 mm, staggered corner codes every 500 mm vertically, and transverse rectangular tubes for reinforcement — and the joint detail at board-to-board joints, door frames, cable penetrations and window apertures. State the delivered weight used for the lift plan. Catalogue sheet mass is 77 kg or 110 kg; because that figure and areal weight times area are not fully consistent, the lift plan uses the delivered weight. A cut-down sheet needs its own weight and its own edge condition on the order; the full-sheet mass does not travel with the offcut.

Compliance and acceptance rest on the attenuation report, the load calculation and the fire documentation

Four documents carry the submittal, and they are not substitutes for one another.

First, an attenuation report for the delivered model, naming beam quality (kV and filtration), measurement geometry, the standard applied and the date. Both models are specified at 2 mmPb; the beam conditions for that figure are in the report. IEC 61331-1 is the method standard for determining attenuation properties of materials used against diagnostic medical X-radiation; citing it does not by itself certify a board. A value measured in one geometry is not transferred to another. The 2 mmPb figure is used only with those beam conditions.

Second, a load calculation: delivered board mass plus frame and adhesive, without double-counting, the project load factor, the number of effective fasteners, and the design resistance of the anchor in the actual substrate, in consistent units. Catalogue figures are 25 kg/m² and 77 kg/sheet for NFPb200-1, and 37 kg/m² and 110 kg/sheet for NFPb200-2; where sheet mass and areal weight times area disagree, use the delivered weight.

Third, fire documentation. The boards are specified with Class A fire performance. Nominal lead equivalence, fire performance and installation performance each need their own test conditions. Ask for the fire-test standard and the report, and build the assembly that was tested, not a similar one. Do not copy a rating from another model or from an untested build-up.

Fourth, as-built drawings of joints, penetrations and apertures. Shielding adequacy is confirmed in the project shielding-design report. A registration notice is not an approval, and a certificate thumbnail is not the batch-relevant test report.

Joints, anchors, face direction and beam energy outside the tested range are the checks that decide handover

The usual leak paths are discontinuities, not the middle of an intact board. Catalogue equivalence of 2 mmPb describes a continuous field. Every butt joint, cut edge, conduit penetration and window aperture has to be detailed and then checked by measurement under the project method.

Anchorage fails in ordinary ways: adhesive on dusty or painted substrates, pull-out from a lightweight partition, creep under sustained load, and a drawing that counts screws which do not share the load. The construction-sheet spacing — 400 mm for the 40 × 60 mm tubes, 500 mm for the staggered corner codes — is not that check. Frame and fasteners are designed for the actual board weight.

Keep the face direction if the delivered board’s own file specifies one. Do not mix the 6.0 mm and 10.0 mm thicknesses in one field unless a report covers that mix. Layer-orientation and energy-matching discussion in the manufacturer’s 2023 technology note applies only to the models that note covers; it is not automatically the construction of NFPb200-1 or NFPb200-2, and it is not a reason to copy a formulation from another product line. These boards are a rare-earth shielding component compounded with a flame-retardant polymer. The note is a report-checking aid (test geometry, energy dependence, document match), not a substitute for the board report. See lead-free X-ray shielding technology note.

Diagnostic-energy data are not extended to high-energy gamma or neutron fields. Those need an assessment based on nuclide, energy, geometry and dose. Leaded transparent acrylic remains a separate, lead-containing product (C-2 to C-12, 2–12 mm, 0.07–0.5 mmPb, 3.2–19 kg/m², light transmittance from 93% at C-2 to 87% at C-12); it does not stand in for the board, for protective glass under IEC 61331-2, or for eyewear and face screens. The boards are lead-free and non-toxic. That does not settle food contact or waste handling; local requirements still apply.

Newlife - Radbar supplies the boards and the leaded acrylic as separate materials for the same wall

Newlife - Radbar supplies the lead-free shielding boards used for this selection and, where the wall needs a viewing aperture, lead-containing transparent acrylic. The two classes are stated separately, so model, thickness and areal weight can be matched to the substrate and to the thickness that remains. That match is an application-engineering task of the Newlife - Radbar team, using the functional-materials research and manufacturing platform of the Newlife Group. The group’s scale and the capacity of any one product line are different facts; neither is taken from a general statement about the other.

Method notes used above, rather than another product’s table, are the technology note and the radiation-protection FAQ. For a selection against a stated wall, contact the application engineering team at https://www.newlifexray.com/en/.

The questions buyers ask before releasing a board order

The catalogue lists the same nominal equivalence for both models. Why specify the thicker board? Both models are 2 mmPb. NFPb200-2 is 10.0 mm, 37 kg/m² and 110 kg/sheet; NFPb200-1 is 6.0 mm, 25 kg/m² and 77 kg/sheet. Thickness is often fixed by something other than shielding: a recess or frame already cut to that board, a specification that names the thickness, or the need to reproduce a tested assembly. The extra areal weight, 12 kg/m², still has to be carried by calculation. The beam conditions for the 2 mmPb figure are in the attenuation report. If the two attenuation reports do not share beam quality, filtration, geometry and standard, that shared nominal figure has not yet been shown to apply to the project beam, and the shielding assessment has to be reopened.

Can anchors be sized from areal weight alone? No. Areal weight is 25 kg/m² or 37 kg/m². Confirm the delivered sheet mass against the catalogue figures of 77 kg and 110 kg. If sheet mass and areal weight times area disagree, stop and use the delivered weight. Add frame, adhesive and fasteners once, apply the project load factor, and compare the resulting force with the anchor’s design resistance in the actual substrate, in the same unit.

Does the thicker board shield more? Not by thickness alone. Both models are specified at 2 mmPb. Compare the attenuation reports, including beam quality, filtration, geometry and standard. Unless those reports show a difference for the delivered models, thickness here is a structural and dimensional variable: 6.0 mm versus 10.0 mm.

Can diagnostic-energy figures be used for a CT room or a higher-energy source? Only inside the beam quality stated in the attenuation report for the 2 mmPb figure. A different spectrum, and any high-energy gamma or neutron question, needs its own evaluation with source, energy, geometry and dose. Image grayscale is not a calibrated lead equivalence.

What goes in the window openings? Leaded transparent acrylic, ordered as a lead-containing product, C-2 to C-12, at its own thickness (2–12 mm; sheet sizes 600 × 800 mm or 1000 × 1200 mm) and its own lead equivalence (0.07–0.5 mmPb), areal weight 3.2–19 kg/m², light transmittance from 93% (C-2) to 87% (C-12). It can be cut, drilled and machined. The aperture is calculated separately from the surrounding board. It is not a lead-free board, and it is not eyewear, a face screen or protective glass.

Send the wall section, the load limit and the beam data to get a board selection and quotation

A workable enquiry states the equipment and its beam conditions (kV, filtration, duty cycle); the required shielding value and the report it comes from; the wall or ceiling type, substrate and spare load capacity; the available thickness and clear dimensions; the delivery and hoisting route; the finish, stated separately from the core (deep walnut, light walnut or light oak grain); and the cleaning and maintenance regime. With those inputs the model — NFPb200-1 at 6.0 mm, 25 kg/m² and 77 kg/sheet, or NFPb200-2 at 10.0 mm, 37 kg/m² and 110 kg/sheet, both at 2 mmPb — frame layout and fastening method can be fixed before the first sheet is cut. Contact Newlife - Radbar through https://www.newlifexray.com/en/ for a board selection and quotation based on that installation space and those load-bearing conditions. The selection does not replace the project shielding assessment or the tested assembly.

References

1. Newlife - Radbar, mechanism and technical advantages of lead-free X-ray shielding materials, 2023-08-07, pp. 6, 8, 10, 12–15. Manufacturer note on energy-dependent absorption, layer orientation, areal density, test geometry and report checks; applies only to the models that note covers, and does not replace the NFPb200 attenuation report. https://www.newlifexray.com/en/technology/lead-free-xray-shielding 2. Newlife - Radbar, radiation-protection FAQ compilation, 7 pp., no date. Entries on mmPb versus thickness, kV/mA, narrow beam versus broad beam, radiation types and selection inputs. https://www.newlifexray.com/en/faq 3. Newlife - Radbar, medical shielding core product page. Cited here only as a different product family; core-series parameters are not used for NFPb200-1 or NFPb200-2. https://www.newlifexray.com/en/products/medical-shielding-core 4. IEC 61331-1:2014, Protective devices against diagnostic medical X-radiation — Part 1: Determination of attenuation properties of materials. Method standard; not a product certificate. 5. IEC 61331-2:2014, Protective devices against diagnostic medical X-radiation — Part 2: Protective glass plates. Scope is protective glass plates, not a substitute for the leaded-acrylic report or for the boards. 6. GBZ 130-2020, Requirements for radiological protection in diagnostic radiology. Assessment framework, not a board certificate. 7. GB 18871-2002, Basic standards for protection against ionizing radiation and for the safety of radiation sources. Assessment framework, not a board certificate. 8. NCRP Report No. 147 (2004), Structural Shielding Design for Medical X-Ray Imaging Facilities. Report-structure reference for medical X-ray imaging facilities; not a board certificate.