| HS Code | 412119 |
| Material | Polyvinyl butyral (PVB) |
| Product Family | Saflex High Protection (HP) |
| Physical Form | Clear interlayer sheet/film |
| Thickness | 0.38, 0.76, 1.14, 1.52 mm |
| Density | 1.08 g/cm³ |
| Tensile Strength | ~20 MPa at 23°C |
| Elongation At Break | ~300% at 23°C |
| Youngs Modulus | ~10 MPa at 23°C (approximately 5x standard PVB) |
| Glass Transition Temperature | ~-2°C |
| Visible Light Transmission | ~90% for clear grade |
| Uv Light Transmission | <1% for wavelengths below 380 nm |
| Haze | <1% |
| Moisture Absorption | ~0.5% typical equilibrium at 23°C/50% RH |
| Service Temperature Range | -40°C to +70°C |
| Impact Resistance | High; suited for hurricane, blast, and security glazing |
| Post Breakage Strength | Holds glass fragments and maintains residual structural integrity |
As an accredited Saflex High Protection (HP) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Saflex High Protection (HP) is supplied in sealed, moisture-resistant packaging containing 25 kg, ensuring safe handling and product stability. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Saflex High Protection (HP): safely packed, securely braced, and efficiently stowed for damage-free transport. |
| Shipping | Saflex High Protection (HP) is a polyvinyl butyral interlayer supplied in rolled form on pallets, wrapped for moisture protection. Ship as non-hazardous dry cargo. Keep upright, dry, and cool; avoid heavy stacking or sharp impacts to prevent roll deformation and edge damage. |
| Storage | Store Saflex High Protection (HP) in its original sealed, moisture-proof packaging in a clean, dry, well-ventilated area. Maintain a cool, stable temperature around 20°C (68°F) and 30–50% relative humidity. Keep away from direct sunlight, heat sources, and solvents. Store rolls flat or upright as supplied, avoid heavy stacking, and use within shelf life. |
| Shelf Life | Shelf life is approximately 12 months from manufacture date when stored in original packaging in a cool, dry environment. |
Specification work for Saflex High Protection (HP) polyvinyl butyral interlayer in export documentation typically begins with the downstream laminate stack rather than with resin compounding. The supplied film thickness, moisture condition, and glass ply configuration determine the mass fraction of interlayer in the finished laminate; the resin-to-plasticizer ratio is fixed during sheet extrusion and is not altered by lamination processors. The following six segments represent the primary industrial applications for which third-party certification evidence and processing records are available.
Automotive windshield lamination with Saflex HP hinges on thickness profile control across the sheet width because a 0.5 mrad deviation in wedge angle shifts the reflected HUD ghost image beyond OEM acceptance limits. The interlayer is typically stacked at 0.76 mm nominal thickness between two 2.1 mm or 2.3 mm bent soda-lime glass plies, corresponding to an interlayer mass fraction of approximately 6.5-7.2 wt% in the finished laminate after autoclave consolidation. Compliance is evaluated under ECE R43 for glazing components intended for EU type approval, with optical transmission, luminous transmittance, and light scattering measured according to ISO 3538 or equivalent OEM specifications; North American shipments reference FMVSS 205 and ANSI/SAE Z26.1. Production-line lamination uses a clean-room layup at 18-20 °C and 20-30% RH, followed by nip-roll de-airing at 60-80 °C and autoclave cycles of 135-140 °C at 1.2-1.4 MPa for 45-90 min. Batch-to-batch variance in PVB surface roughness and plasticizer migration kinetics can alter de-airing performance; processors using high-volume automotive lines therefore monitor roll-bite pressure and pre-press edge sealing temperature by infrared pyrometer to prevent premature edge closure before residual air is fully removed. End products include laminated windshields, HUD-enabled windshields with integrated wedge interlayer, and laminated side glazing where ejection-mitigation requirements extend beyond tempered glass.
Architectural overhead glazing specified with Saflex HP replaces heat-soaked tempered monolithic glass when post-breakage retention is required under horizontally installed glazing. The standard laminate stack pairs 1.52 mm interlayer with two 3 mm heat-strengthened or annealed glass plies, placing the interlayer mass fraction at approximately 9.8 wt% of the finished laminate; cantilevered balustrades in public circulation areas frequently increase the interlayer to 2.28 mm, raising the calculated mass fraction to 14.0 wt%. Compliance documentation follows EN 14449 for laminated safety glass and EN ISO 12543-2 for product classification, with residual strength and fragmentation behavior referenced to EN 12600; in North America the applicable product specification is ASTM C1172, with safety classification under ANSI Z97.1. Processing differs from automotive lines in that architectural glass often enters lamination after heat strengthening or tempering, which introduces sheet bow and edge compression that must be compensated by vacuum-bag de-airing rather than nip-roll pre-pressing. The autoclave curve is held at 125-135 °C and 1.1-1.3 MPa for 60-120 min, with the longer plateau required for thick multi-ply stacks to allow the core glass ply to reach adhesion temperature. Production records from architectural laminating plants show that moisture content of Saflex HP above 0.55 wt% at layup can generate delamination halo defects after the high-humidity durability sequence of EN ISO 12543-4, so pre-conditioning rooms are maintained at 20-25 °C and 25-35% RH for at least 48 h. End products include overhead glazing, sloped skylights, point-supported glass fins, glass floors, and frameless balustrades where post-breakage retention is a design criterion.
The question can be resolved by examining the large-missile impact sequence of ASTM E1996. A laminated make-up using only 0.76 mm Saflex HP between 3 mm glass plies absorbs the initial missile strike but frequently tears at the clamped edge after the cyclic pressure sequence because the interlayer mass fraction is only approximately 5.1 wt% and the polymer cross-section cannot redistribute the tensile stress concentration. Increasing the interlayer to 1.52 mm raises the interlayer mass fraction to approximately 9.8 wt% and doubles the polymer cross-sectional area, allowing the same raw film chemistry to pass the ASTM E1886/E1996 windborne-debris protocol without changing the glass type. Compliance for Florida and Miami-Dade product approval is documented under TAS 201/202/203 and ASTM E1996 Missile Level D, while the product standard for the glazing unit remains ASTM C1172. Lamination on a hurricane-glazing production line uses a clean-room layup of heat-strengthened or annealed glass with multiple interlayer plies, followed by vacuum-bag de-airing at 80-100 °C because nip-roll systems cannot remove air from the rough patterned glass surfaces used for impact-rated fenestration. Autoclave parameters are held at 135-140 °C and 1.3-1.5 MPa for 90-150 min; thermocouple data from production run logs indicate that a 6.5 mm total glass stack with 1.52 mm Saflex HP reaches core temperature approximately 25-35 min later than a thin windshield stack, so cycle timers must be extended to avoid low-adhesion edges at the gasket wetting line. End products include impact-rated window units, hurricane-resistant sliding doors, curtain-wall spandrel panels, and storefront systems installed in wind-borne debris regions defined by the Florida Building Code.
Forced-entry glazing in retail storefronts and ground-level curtain walls uses Saflex HP in asymmetric multi-ply stacks that delay tool penetration rather than dissipate a single large-missile impact. A typical burglar-resistant make-up alternates 4 mm glass, 1.52 mm Saflex HP, 4 mm glass, and 1.52 mm Saflex HP, producing an interlayer mass fraction near 14 wt% of the finished laminate; when the attack level requirement rises to EN 356 P6B or higher, processors add a third interlayer ply or increase the glass outer plies to 6 mm rather than substituting a chemically incompatible ionomer. Compliance is tested to EN 356 using a falling-ball impact followed by a defined axe-and-hammer manual-attack sequence, while North American specifications commonly cite UL 972 and ASTM F1233. Production on a security-glazing autoclave line requires edge-seal compatibility checks because multiple interlayer plies generate higher edge bleed of plasticizer during heating; operators cut the Saflex HP sheets 2-5 mm undersized from the glass edge to allow controlled plasticizer migration without contaminating the vacuum-bag seal. Autoclave pressure is limited to 1.2-1.4 MPa and temperature to 130-138 °C for 120-180 min; excessive pressure on thick multi-ply stacks produces visible glass stress birefringence at drilled or notched edge details, which can reduce residual strength after the forced-entry test. End products include display-case glazing, jewelry-store windows, detention-grade observation panels, and ground-floor curtain-wall lites where delayed forced entry is a design requirement.
Ballistic glazing assembled with Saflex HP is not a single interlayer solution but a transparent armor build that combines multiple glass plies, Saflex HP interlayer sheets, and in many designs a polycarbonate spall liner on the protected side. A documented UL 752 Level 3 configuration typically uses 9-13 mm total glass, two or three 1.52 mm Saflex HP sheets, and a 2-3 mm polycarbonate liner, with the PVB phase accounting for roughly 11-16 wt% of the composite stack; however, published data for this specific configuration is limited because exact stack geometry is proprietary to laminators and certified product suppliers. The controlling standard is UL 752 for bullet-resisting equipment, with supplementary classification under EN 1063 for European projects and material qualification under NIJ 0108.01 where specified. Downstream production is a two-stage process: the glass and Saflex HP are first autoclaved at 130-140 °C and 1.3-1.5 MPa for 90-180 min, then the polycarbonate spall liner is bonded in a secondary vacuum lamination step below 80 °C to avoid thermal deformation of the polycarbonate. The primary processing risk is edge separation at the glass-PVB interface near the ballistic test frame, which is why certified processors restrict autoclave soak time to the minimum required for full adhesion and conduct 100% ultrasonic edge scanning before machining. End products include cashier screens, bank transaction windows, control-room glazing, and armored vehicle vision blocks where the PVB stack retains glass fragments and the polycarbonate arrests projectile residual energy.
Blast-resistant façade glazing specified for control rooms and high-risk government buildings subjects Saflex HP to short-duration positive and negative pressure loads that can exceed 50 kPa in arena blast testing. The glazing make-up often combines a 4 mm heat-strengthened outer ply, a 1.52 mm Saflex HP interlayer, a 4 mm heat-strengthened inner ply, a second 1.52 mm Saflex HP interlayer, and a 3 mm annealed inner lite; the interlayer mass fraction is approximately 10.6 wt% of the laminate, and the polymer phase must retain glass fragments after both the positive blast wave and the negative suction rebound. Compliance for arena air-blast loading is documented under ISO 16933 and ASTM F1642, while European projects may cite EN 13541; the window assembly including framing and anchorage is tested as a complete unit, not as an isolated glass coupon. Lamination must account for the fact that blast-rated laminates often use drilled holes for structural bolt fixings, and these edge discontinuities become adhesion failure initiation sites if Saflex HP moisture content at layup exceeds 0.45 wt%. Autoclave processing uses 135-140 °C and 1.2-1.4 MPa for 120-180 min, followed by slow cool at 1-2 °C/min through the glass transition region to minimize temporary tensile edge stress. End products include control-room windows, embassy façade lites, transformer-bay observation windows, and high-risk entrance glazing where fragment retention and controlled deflection are specified in the blast design brief.
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Saflex High Protection (HP) is a polyvinyl butyral (PVB) interlayer grade supplied in roll form for laminated safety glass, impact-resistant glazing, and forced-entry/ballistic composite assemblies. The model designation identifies the high-protection segment of the PVB product family rather than a single thickness or optical grade. Standard nominal sheet thicknesses are 0.76 mm, 1.52 mm, 2.28 mm, and 3.04 mm, with roll widths and cut lengths specified by converter scheduling. Base PVB density is approximately 1.07 g/cm³ when tested under ASTM D792-20. Incoming sealed packaging should maintain residual moisture below 0.5%; opened rolls must be re-conditioned before lay-up.
In the laminated glass production sequence, the interlayer is positioned between clean glass plies under controlled temperature and relative humidity conditions. The glass/interlayer/glass stack is then pre-pressed through a roller press and consolidated in an autoclave. Final safety-glass classification is not a property of the interlayer alone; it is assigned to the specific glass build after pendulum impact testing to EN 12600:2002, and architectural laminated flat glass is specified according to ASTM C1172-19.
Standard PVB grades are formulated for general architectural lamination and vehicle glazing. The HP designation is positioned above these grades in the PVB product segment, with a tighter residual moisture specification and a modified plasticizer/anti-block package. The effect is an increase in film modulus and a reduction in creep under continuous positive wind load at facade temperatures that exceed 40 °C. Comparative tensile modulus data for the exact HP grade are limited in publicly available bulletins; when verification is required, specimens should be cut and measured according to ISO 527-3:2018 at 23 °C and 50% RH. Ionoplast interlayers are not PVB-based and typically show significantly higher tensile modulus and post-glass-breakage stiffness; HP does not duplicate ionoplast performance, but it is specified as a PVB-based upgrade where standard PVB creep or impact retention is insufficient.
In lamination lines equipped with multi-zone IR heaters and two-stage roller presses, the HP sheet requires a lay-up room at 18 °C to 20 °C and 25% RH to 35% RH. Glass surface temperatures during pre-pressing are held between 60 °C and 80 °C. Nip roll pressure and line speed are adjusted to laminate thickness, but roll pressure must not be increased to compensate for cold glass because edge air entrapment becomes locked in the pre-laminate. Autoclave consolidation is typically performed at 125 °C to 135 °C and 1.0 MPa to 1.3 MPa for 90 min to 120 min. The heat-up ramp should not exceed 5 °C/min below 100 °C to avoid differential pressure at the glass edge. Failure to meet the moisture control band before autoclaving leads to bubble formation and reduced edge adhesion.
HP-grade laminates are commonly submitted to impact assessment under ASTM E1886-19 and ASTM E1996-21 for windborne debris and cyclic pressure loading. These test programs specify missile weight, missile speed, impact location, and pressure cycling sequences; compliance is assigned to the full fenestration assembly, not to the interlayer by itself. For European façades, pendulum impact classification follows EN 12600:2002, and the resulting drop height/breakage mode is reported with the glass make-up. Where tensile tear resistance is the dominant interlayer property during missile impact, candidate sheets can be compared using ISO 6383-2; published tear-propagation values for the exact HP grade remain configuration-dependent. Ballistic assemblies are validated under ASTM F1233-21 or UL 752, and the selection of a 3.04 mm HP interlayer requires full-thickness testing with the specified glass, because ballistic performance is highly sensitive to frit, glass surface stress, and framing cladding.
Adhesion control and moisture residence time are the two process variables that generate most production-line deviation in high-protection laminates. The HP sheet is conditioned in a lay-up room before use; equipment air handling must maintain dew point below 8 °C because interlayer surface moisture uptake accelerates when ambient RH exceeds 35%. If the opened roll is not re-conditioned for at least 4 h at 18 °C to 20 °C, the resulting moisture gradient produces uneven interfacial adhesion after autoclaving. The industry-standard pummel test used for interlayer adhesion lacks a direct ISO or ASTM method designation; it is reported on a 0–10 scale and serves as an internal batch-to-batch control. Where a recorded pummel value shifts by more than one unit against the same glass substrate, the lamination operator should inspect conditioning logs before adjusting roll pressure or autoclave temperature.
Production sites in coastal areas often experience summer lay-up room RH above 40%. Under these conditions, direct transfer of HP sheet from refrigerated storage to the clean room should be avoided. Rolls should remain sealed until their surface temperature reaches lay-up room temperature, typically after 8 h to 12 h. A rapid transfer creates condensation on the film surface, producing visible edge bubbles after autoclaving. If the line lacks active dehumidification, pre-lamination should be restricted to glass surface temperatures in the lower half of the 60 °C to 80 °C window to prevent moisture from flashing at the glass-ply edges. Laminated builds processed outside this band may pass initial optical inspection but fail day-three post-autoclave adhesion or impact testing.
For bomb blast and forced-entry glazing, thicker interlayers are often combined with multi-laminate glass builds of 10 mm to 20 mm total thickness. The HP grade can be used as a single sheet or as a stacked interlayer assembly. Thicker stack lamination requires longer autoclave dwell; increasing temperature above 135 °C is not a substitute for pressure, because PVB degradation accelerates above 140 °C and may create visible edge yellowing. The autoclave control loop should log pressure ramp, temperature at the center of the glass, and cool-down to below 50 °C before depressurization to avoid delamination.
Optical performance after lamination is measured to ASTM D1003-21 for haze and total luminous transmittance. Typical clear PVB laminates with 2.28 mm interlayer show luminous transmittance above 88% when fabricated with clear low-iron glass; reported values will be lower for tinted or coated glass assemblies. The HP sheet’s UV-blocking additives suppress UV transmittance in the 280 nm to 390 nm band, as verified by spectrophotometry according to ISO 9050:2003 or equivalent. Environmental durability of the assembled laminate is assessed under ASTM C1036 and ASTM C1172-19 visual acceptance criteria rather than by accelerated weathering of the interlayer alone.
Non-destructive inspection of the finished laminate should include edge-bubble detection, thickness mapping, and through-glass optical distortion checks using a Zebra board or equivalent. For full-size security doors, final dimensional verification follows the specified cutting tolerance in ASTM C1172-19. Incoming film thickness is verified with a calibrated laser micrometer at 23 °C; variance within a roll should remain within the supplier certificate, typically ±0.02 mm for 0.76 mm sheet and ±0.04 mm for heavier gauges. Laminators that skip incoming thickness verification may see local autoclave pressure anomalies because oversized sheet sections create non-uniform flow at the glass edge.
| Standard / Method | Parameter or Requirement | Use in HP-Grade Acceptance |
|---|---|---|
| ASTM D792-20 | Density of base film | Incoming material verification near 1.07 g/cm³ |
| ISO 527-3:2018 | Tensile strength and elongation of film | Comparative mechanical characterization at 23 °C |
| ASTM D1003-21 | Haze and luminous transmittance | Optical acceptance after lamination |
| EN 12600:2002 | Pendulum impact performance | Safety classification of laminated glass |
| ASTM E1886-19 / ASTM E1996-21 | Windborne debris and cyclic pressure | Impact-resistant fenestration qualification |
| ASTM C1172-19 | Visual quality, thickness, laminate defects | Architectural acceptance |
| ASTM F1233-21 / UL 752 | Security glazing performance | Ballistic or forced-entry capability, assembly-specific |
For projects that require documented batch traceability, incoming HP rolls should be assigned a lot number and retained samples of film should be archived for at least 24 months after lamination. Lamination records should include the roll identity, time from package opening to lay-up, lay-up room temperature and RH, and autoclave cycle data. If a lot shows edge bubble formation in flat-sheet production, the first corrective action is to verify moisture conditioning history, not to increase autoclave pressure. When all recorded parameters fall within the control band and edge defects persist, incoming film thickness and glass cleanliness are the next variables to inspect.
