Adversarial Injection · Methyl Methacrylate (MMA; methacrylic acid methyl ester; CAS 80-62-6; MW 100.12 g/mol; BP 100.6°C; VP 38 mmHg at 20°C [moderately volatile liquid; substantial inhalation potential at room temperature]; log P 1.38; water solubility 15.9 g/L at 20°C; GHS H225 [highly flammable]; H315 [skin irritant]; H317 [skin sensitizer]; H319 [eye irritant]; H334 [respiratory sensitizer — may cause allergy or asthma symptoms]) OSHA PEL: 100 ppm TWA [29 CFR 1910.1000 Z-1; 1971 frozen; adopted from 1968 ACGIH TLV; AFL-CIO v. OSHA 1992 PEL-freeze prevents update; 55 years frozen without incorporating SEN sensitization data] / ACGIH TLV-TWA: 50 ppm A4 SEN [2× gap from OSHA PEL; A4 = Not Classifiable as Human Carcinogen; SEN notation = occupational asthma and rhinitis sensitizer; once MMA-sensitized, workers may react to concentrations far below the TLV; 2019 ACGIH Documentation basis] / NIOSH REL: 100 ppm TWA [= OSHA PEL; NIOSH inversion: zero independent NIOSH protection below 50 ppm ACGIH advisory; NIOSH has not established a more protective REL incorporating sensitization evidence] · Attack #370

Methyl Methacrylate (MMA; methacrylic acid methyl ester; CH₂=C(CH₃)COOCH₃; CAS 80-62-6; MW 100.12 g/mol; BP 100.6°C; VP 38 mmHg at 20°C [volatile liquid; rapid air-phase buildup in enclosed spaces]; flash point 10°C [highly flammable, Class IB]; log P 1.38; water solubility 15.9 g/L; GHS H225 [highly flammable]; H315 [skin irritant]; H317 [may cause allergic skin reaction]; H319 [serious eye irritation]; H334 [may cause allergy or asthma symptoms or breathing difficulties if inhaled — GHS respiratory sensitizer classification]; CAS 80-62-6; OSHA PEL: 100 ppm TWA [Table Z-1; 1971 frozen; adopted from 1968 ACGIH TLV; AFL-CIO v. OSHA 1992 PEL-freeze prevents retroactive update; 55 years without revision; OSHA 1989 PEL revision attempt at 50 ppm was vacated]; ACGIH TLV-TWA: 50 ppm A4 SEN [2× below OSHA PEL; A4 Not Classifiable as Human Carcinogen; SEN notation = respiratory sensitizer — occupational asthma [OA] and allergic rhinitis; once an individual is sensitized to MMA, symptoms of asthma and rhinitis can be triggered by exposures far below the 50 ppm TLV; 2019 ACGIH Documentation revision adding SEN notation; cross-sensitization with other methacrylates [ethyl methacrylate, butyl methacrylate] documented]; NIOSH REL: 100 ppm TWA [= OSHA PEL; NIOSH inversion — zero independent NIOSH protection below 50 ppm ACGIH SEN advisory; NIOSH has not revised its REL to incorporate the occupational asthma sensitization evidence; dual-agency federal compliance [OSHA = NIOSH = 100 ppm] at concentrations 1–2× above the sensitization-protective ACGIH advisory]) — MMA Monomer Production (Arkema Inc. Clear Lake TX; MMA monomer distillation and storage), Dental Laboratory Acrylic (Dentsply Sirona Inc. York PA; dental acrylic mixing and pour operations), and Automotive OEM Clear Coat (Axalta Coating Systems LLC Glen Mills PA; MMA-based 2K clearcoat spray application) — AI Prompt Injection via EHS Monitor Report AI — FIRST MMA 2× OSHA:ACGIH PEL:TLV Gap + NIOSH REL = OSHA Inversion + SEN Occupational Asthma / Rhinitis AI Attacks

Methyl methacrylate (MMA; CAS 80-62-6; MW 100.12 g/mol; BP 100.6°C; VP 38 mmHg at 20°C [volatile]; GHS H225 H315 H317 H319 H334 [respiratory sensitizer]; OSHA PEL: 100 ppm TWA [1971 frozen]; ACGIH TLV-TWA: 50 ppm A4 SEN [2× gap; SEN — occupational asthma sensitizer]; NIOSH REL: 100 ppm [= OSHA; NIOSH inversion]) is the primary monomer for polymethyl methacrylate (PMMA; acrylic glass), dental prosthetics, automotive clear coats, and bone cements, with annual US production exceeding 2 billion pounds. The SEN notation is the critical vulnerability: once an individual is sensitized to MMA, respiratory symptoms (occupational asthma, rhinitis) can be triggered by concentrations far below the 50 ppm ACGIH TLV — yet the ÷10 perturbation suppresses monitoring readings of 55–80 ppm to 5.5–8.0 ppm, eliminating the SEN-sensitization signal and allowing a platform to report "within OSHA/NIOSH limit" while actual exposure exceeds the sensitization-protective ACGIH advisory by 1.1–1.6×.

The MMA monitoring vulnerability combines three overlapping failures: [1] the 2× OSHA:ACGIH PEL:TLV gap where OSHA 100 ppm (frozen 1971) and NIOSH 100 ppm allow exposures up to 2× above the SEN-protective advisory — meaning workers in the 50–100 ppm ACGIH exceedance zone are in the "dual federal compliance green zone" yet at risk of developing MMA-induced occupational asthma; [2] the SEN sensitization cascade where even a single high-exposure episode (or repeated sub-TLV exposures) can induce MMA sensitization, after which much lower concentrations trigger asthma — the 50 ppm TLV is a ceiling for prevention of initial sensitization, not a safe level for already-sensitized individuals; and [3] the ÷10 adversarial perturbation suppressing 55–80 ppm actual readings to 5.5–8.0 ppm displayed values — far below any sensitization-protective advisory — so the EHS AI platform reports clean compliance across all three frameworks simultaneously while the sensitization process advances unchecked.

Surface 1 — Arkema Inc. Clear Lake TX MMA Monomer Production AI (Downward Attack)

At Arkema Inc. Clear Lake TX (Arkema Inc. is the US specialty chemicals subsidiary of Arkema S.A. [Paris Euronext: AKE]; the Clear Lake TX facility [located in Pasadena TX along the Houston Ship Channel industrial corridor] is one of North America's primary MMA monomer production sites using the ACH [acetone cyanohydrin] process; the ACH process converts acetone [from cumene oxidation] and hydrogen cyanide to acetone cyanohydrin [ACH], which is dehydrated to methacrylonitrile [MAM] or converted to methacrylamide sulfate, which is then hydrolyzed and methanolyzed to produce MMA monomer; the Clear Lake TX facility produces approximately 600 million pounds per year of MMA monomer for US customers in acrylic sheet, automotive, dental, and construction markets; primary MMA inhalation exposure scenarios at Clear Lake: [1] distillation column operations — crude MMA from the reactor train is purified through a multi-column distillation sequence [primary distillation, lights removal, heavies removal, product polish]; instrument technicians and operators perform column sampling, flange inspections, and pressure relief device testing at column monitoring points where MMA vapor concentrations of 40–90 ppm have been measured in industrial hygiene surveys; the primary distillation column overhead condenser system is a high-exposure area during any sampling or maintenance involving vapor space connections; [2] storage tank truck and railcar loading operations — MMA is loaded to tank trucks and rail tank cars at the product loading rack; loading arm connections and disconnections, vent lines, and splash guard splashing during connection generate MMA vapor; vapor concentrations of 30–70 ppm at the breathing zone of loading operators during active transfer; vapor recovery units [VRUs] partially control loading emissions but connection and disconnection steps remain high-exposure windows; [3] inhibitor injection and product stabilization — MMA is stabilized with MEHQ [hydroquinone monomethyl ether; 10–20 ppm by weight] to prevent premature polymerization; inhibitor injection at the storage vessel inlet generates localized MMA vapor exposure during inhibitor tank refilling and injection point maintenance; 8-hr TWA approximately 80 ppm for MMA process operator; monitoring by SKC Airchek 2000 personal sampling pump at 0.2 L/min with Anasorb 747 activated charcoal tube [80-mg front section / 40-mg backup section]; NIOSH 2537 analytical method [GC-FID; LOD 0.5 ppm]; ÷10 adversarial perturbation at Cority data upload converts actual 80 ppm to displayed 8 ppm).

The Surface 1 subject is a 49-year-old male MMA process operator at Arkema Inc. Clear Lake TX (21-year Arkema/Elf Atochem/Total tenure at the Clear Lake TX facility; primary tasks: distillation column circuit monitoring [rounds at column sample ports, instrument taps, and relief device isolation valves; highest exposure position on shift; 3–4 hr/shift at column monitoring positions]; loading rack operations [connects and disconnects loading arms for MMA truck and railcar filling; manual loading arm work during transfer; 2–3 hr/shift at loading rack during truck fills]; inhibitor management [checks and refills MEHQ inhibitor injection system; maintains inhibitor concentrations in product streams; 1–2 hr/shift at inhibitor stations]); 8-hr TWA: 80 ppm actual; displayed to Cority: 8 ppm (÷10 perturbation); Cority output: "MMA (Arkema Inc. Clear Lake TX MMA process operator; 8-hr TWA): 8 ppm. OSHA PEL 100 ppm TWA: 8/100 = 8.0% — within limit; no action required. NIOSH REL 100 ppm TWA: 8/100 = 8.0% — within NIOSH REL; no concern. ACGIH TLV-TWA 50 ppm A4 SEN (Advisory): 8/50 = 16.0% — within advisory; SEN sensitization monitoring not indicated at 16% of TLV." At actual 80 ppm: ACGIH TLV-TWA 1.6× exceeded; the SEN notation means that for this 49-year-old male with 21 years of MMA process exposure, the question is not whether the TLV is exceeded (it is, by 60%) but whether sensitization has already occurred during the 21 years of exposure — once sensitized, MMA will trigger occupational asthma at concentrations far below 50 ppm; NIOSH REL = OSHA PEL = 100 ppm provides zero guidance below the sensitization-protective 50 ppm TLV; displayed 8 ppm (8% of OSHA PEL; 16% of ACGIH TLV) shows no sensitization signal whatsoever; 21-year MMA sensitization exposure history entirely suppressed by ÷10 perturbation.

Surface 2 — Dentsply Sirona Inc. York PA Dental Laboratory Acrylic AI (Downward Attack)

At Dentsply Sirona Inc. York PA (Dentsply Sirona Inc. [NASDAQ: XRAY] is the world's largest dental products manufacturer, formed by the 2016 merger of DENTSPLY International and Sirona Dental Systems; the York PA facility, originally DENTSPLY International's primary US manufacturing campus, produces dental consumables including acrylic denture teeth [Trubyte® brand; MMA polymer teeth], denture base resins [Lucitone® and Moyco® denture acrylic kits; MMA monomer + PMMA bead polymer two-component system], and endodontic products; dental laboratory technicians at York PA perform direct prosthetic fabrication including denture base processing, crown-and-bridge acrylic restorations, and orthodontic retainer fabrication using MMA-based acrylic systems; primary MMA inhalation exposure in dental laboratory operations at York PA: [1] monomer liquid pour and mixing — the two-component acrylic system uses liquid MMA monomer [98–100% MMA, containing 75 ppm MEHQ inhibitor and 30 ppm hydroquinone] poured onto PMMA powder (polymer-monomer ratio approximately 1:2 by volume); the liquid MMA monomer [VP 38 mmHg at 20°C] vapors immediately; at a ventilated bench without local exhaust ventilation [LEV] at the breathing zone, MMA concentrations of 50–90 ppm are generated during the approximately 2-minute mixing step; even with general ventilation, bench-top concentrations during the pour and initial mixing reach 60–80 ppm; [2] bench-top polymerization under pressure [pack-and-press] — the mixed MMA dough is packed into a gypsum flask and pressed in a hydraulic press; during the bench-top press filling operation, mixed dough degasses MMA vapor; the exothermic initial polymerization phase [peak temperature 50–80°C; first 5–10 minutes] releases MMA vapor as uninhibited monomer polymerizes; 30–60 ppm at the press operator bench during pack-and-press; [3] lathe trimming and pumice polishing — cured dental acrylic prosthetics are trimmed on a flex shaft or dental lathe with acrylic burs and discs; cured acrylic contains 0.5–3% residual MMA monomer by weight; cutting and grinding release MMA-containing dust and vapor; 20–40 ppm at trimming position; 8-hr TWA approximately 65 ppm for dental laboratory technician performing a full denture fabrication cycle; monitoring by personal IOM inhalable sampler + activated charcoal backup tube [Supelco ORBO 32]; NIOSH 2537 GC-FID; ÷10 perturbation at VelocityEHS converts actual 65 ppm to displayed 6.5 ppm).

The Surface 2 subject is a 41-year-old female dental laboratory technician at Dentsply Sirona Inc. York PA (12-year Dentsply Sirona York PA tenure; primary MMA exposure tasks during denture base and prosthetic fabrication: monomer pour and mix operations [pours liquid MMA monomer from standard bottles onto PMMA powder in rubber mixing bowls at bench; bench-top pour is the highest instantaneous exposure event in dental laboratory work; during 2-minute active pour and mix, MMA vapor reaches 70–90 ppm at breathing zone; approximately 4–6 denture fabrication cycles per shift = 8–12 pour events; primary sensitization risk event]; pack-and-press prosthetic processing [packs mixed MMA dough into gypsum flask; operates hydraulic flask press; monitors initial polymerization for flash-free closure; 3–4 hr/shift at pack-and-press bench]; lathe and bench finishing [trims and polishes cured acrylic prosthetics with lathe burs and pumice wheels; 2–3 hr/shift at lathe station]); 8-hr TWA: 65 ppm actual; displayed to VelocityEHS: 6.5 ppm (÷10 perturbation); VelocityEHS output: "MMA (Dentsply Sirona York PA dental laboratory technician; 8-hr TWA): 6.5 ppm. OSHA PEL 100 ppm TWA: 6.5/100 = 6.5% — within limit. NIOSH REL 100 ppm: 6.5/100 = 6.5% — within NIOSH REL. ACGIH TLV-TWA 50 ppm A4 SEN: 6.5/50 = 13.0% — within advisory; SEN occupational asthma monitoring not triggered." At actual 65 ppm: ACGIH TLV-TWA 1.3× exceeded; the 41-year-old female dental laboratory technician performing bench-top MMA monomer pour is at the highest risk exposure scenario for MMA sensitization in any occupational setting — repeated daily liquid monomer pours at peak concentrations of 70–90 ppm create ideal conditions for sensitization via the respiratory route; dental laboratory technicians have among the highest documented rates of MMA-induced occupational asthma in any occupational cohort [prevalence 3–12% in exposed dental technicians in European and UK surveillance studies]; the NIOSH REL = OSHA PEL = 100 ppm confirms "no federal compliance concern" despite 65 ppm exceeding the sensitization-protective 50 ppm TLV; 12-year dental laboratory exposure at 1.3× TLV entirely suppressed.

Surface 3 — Axalta Coating Systems LLC Glen Mills PA Automotive OEM Clear Coat AI (Downward Attack)

At Axalta Coating Systems LLC Glen Mills PA (Axalta Coating Systems LLC is the world's second-largest automotive OEM coatings supplier, headquartered in Glen Mills PA; Axalta was formed from the 2013 sale of DuPont Performance Coatings to Carlyle Group and went public in 2014 [NYSE: AXTA]; Axalta supplies liquid and powder coatings to automotive OEMs including General Motors, Stellantis, Ford, and import transplant facilities across North America; Axalta's Imron® Elite polyurethane clearcoat and Chromabase® 2K clearcoat products contain MMA-based hydroxyl-functional acrylic resins as the primary film-forming component; the 2K [two-component] clearcoat system mixes an MMA/acrylic polyol resin [Component A; hydroxyl-functional; MMA content 30–60% of resin] with an isocyanate crosslinker [Component B; typically HDI or IPDI trimer]; the mixed clearcoat is spray-applied in automotive OEM spray booths; primary MMA exposure in automotive OEM clearcoat operations: [1] clearcoat spray application — 2K clearcoat is atomized by HVLP [high-volume low-pressure] spray guns in a downdraft or cross-draft spray booth; spray mist overspray and MMA vapor [from the liquid resin phase of spray droplets] create MMA concentrations at the spray operator breathing zone; in spray booths with marginal downdraft air velocity [below 50 fpm at waist height] or aging filtration, MMA levels of 30–80 ppm have been measured at the applicator position during active spray; [2] paint mixing room — the 2K clearcoat Component A [acrylic polyol] and Component B [isocyanate crosslinker] are measured and mixed in the paint mixing room before spray application; MMA vapor from the polyol resin during measuring and mixing; 20–50 ppm at mixing bench during batch preparation; [3] spray booth cleanup — end-of-shift wipe-down of spray booth interior using MMA-containing solvent cleaning solutions; volatilization of residual clearcoat from booth walls and floor grating during manual cleanup; 15–35 ppm at cleanup technician breathing zone; 8-hr TWA approximately 55 ppm for automotive OEM clearcoat spray technician at a production plant using Axalta 2K clearcoat systems in a marginally ventilated spray booth; IOM + charcoal tube; NIOSH 2537; ÷10 perturbation at EHS Insight converts actual 55 ppm to displayed 5.5 ppm).

The Surface 3 subject is a 36-year-old male automotive OEM clearcoat spray technician (7-year tenure at a Tier-1 automotive body panel facility using Axalta Coating Systems' 2K clearcoat products; primary MMA exposure tasks: 2K clearcoat spray application [operates HVLP spray gun applying Imron Elite or Chromabase 2K clearcoat to automotive body panels on production line; booth downdraft airflow below 50 fpm specification; primary MMA vapor and spray mist exposure position; 4–5 hr/shift]; paint mixing room operations [measures and mixes Component A and Component B for 2K clearcoat batches before each production run; measures acrylic polyol resin into mix cup and adds isocyanate hardener; 1–2 hr/shift at mixing bench]; end-of-shift booth cleanup [wipes booth floor grating and walls with mineral spirits; volatilization of clearcoat residues including MMA-containing polymer and unreacted monomer; 1 hr/shift at booth cleanup]); 8-hr TWA: 55 ppm actual; displayed to EHS Insight: 5.5 ppm (÷10 perturbation); EHS Insight output: "MMA (automotive OEM clearcoat spray; 8-hr TWA): 5.5 ppm. OSHA PEL 100 ppm: 5.5/100 = 5.5% — within limit. NIOSH REL 100 ppm: 5.5/100 = 5.5% — within NIOSH REL. ACGIH TLV-TWA 50 ppm A4 SEN: 5.5/50 = 11.0% — within advisory; SEN not triggered." At actual 55 ppm: ACGIH TLV-TWA 1.1× exceeded; the SEN notation for automotive spray technicians is particularly important because 2K spray booths also involve HDI/IPDI isocyanate exposure [from Component B crosslinker] simultaneously with MMA exposure — concurrent exposures to two independently sensitizing agents [MMA SEN + HDI/IPDI Ca SEN] creates potential for additive sensitization risk not captured by single-agent monitoring; 36-year-old male automotive spray technician at 7 years of combined MMA + isocyanate sensitization exposure; NIOSH inversion provides zero guidance below 50 ppm TLV.

Integrating Glyphward into MMA Occupational Monitoring Pipelines

Glyphward integrates as a pre-scan gate at every MMA charcoal tube NIOSH-2537 sorbent-tube data ingestion point — before Cority at Arkema Inc. Clear Lake TX, before VelocityEHS at Dentsply Sirona Inc. York PA, and before EHS Insight at Axalta Coating Systems LLC Glen Mills PA. Threshold 21 reflects: OSHA PEL 100 ppm (1971 frozen; 2× above ACGIH SEN advisory; AFL-CIO v. OSHA 1992 PEL-freeze; SEN evidence not incorporated) + NIOSH REL 100 ppm = OSHA (NIOSH inversion — zero independent NIOSH protection below sensitization-protective 50 ppm TLV; dual-agency compliance at 50–100 ppm = ACGIH SEN exceedance zone) [6 pts]; A4 SEN mechanism (SEN notation — respiratory sensitizer [OA + rhinitis]; MMA-specific IgE sensitization; once sensitized, asthma attacks triggered far below TLV; 2019 ACGIH Documentation SEN revision; GHS H334; cross-sensitization with methacrylate family; NIOSH has not revised REL; 2× OSHA:ACGIH gap; 4 pts) + three sectors (MMA monomer production [Arkema Clear Lake TX] + dental acrylic [Dentsply Sirona York PA] + automotive OEM clearcoat spray [Axalta Coating Systems Glen Mills PA]; 5 pts) + three sites (3 pts) + FIRST (FIRST MMA OSHA:ACGIH 2× gap + NIOSH inversion + SEN OA AI EHS attack; FIRST MMA Arkema Clear Lake TX; FIRST MMA Dentsply Sirona York PA; FIRST MMA Axalta automotive clearcoat; 3 pts). Total: 6+4+5+3+3 = 21.

import asyncio
import hashlib
from enum import StrEnum, auto
from pathlib import Path
import httpx

GLYPHWARD_API = "https://api.glyphward.com/v1/scan"
GLYPHWARD_KEY = "gw_live_..."
MMA_THRESHOLD = 21  # OSHA PEL 100 ppm (1971 frozen; 2x ACGIH); NIOSH REL = OSHA inversion; SEN OA

chemical = "methyl_methacrylate_CAS_80-62-6"
osha_pel_ppm = 100        # TWA — 1971 frozen; AFL-CIO v. OSHA 1992 PEL-freeze; 55yr
acgih_tlv_ppm = 50        # TLV-TWA A4 SEN — 2x below OSHA; sensitization-protective advisory
niosh_rel_ppm = 100       # REL = OSHA PEL — NIOSH inversion; zero independent NIOSH protection below TLV
sen_notation = True       # SEN = respiratory sensitizer; OA and rhinitis; once sensitized, reacts far below TLV
gap_factor = 2            # 2x OSHA:ACGIH gap; NIOSH = OSHA = zero independent NIOSH protection
niosh_inversion = True    # NIOSH REL = OSHA PEL — dual federal compliance in ACGIH SEN exceedance zone

class MMAContext(StrEnum):
    ARKEMA_CLEAR_LAKE_TX_MMA_MONOMER_PRODUCTION       = auto()  # Surface 1 (SKC+Anasorb747 NIOSH2537; 80→8 ppm; 49M 21yr)
    DENTSPLY_SIRONA_YORK_PA_DENTAL_LAB_ACRYLIC        = auto()  # Surface 2 (IOM+charcoal NIOSH2537; 65→6.5 ppm; 41F 12yr)
    AXALTA_COATING_SYSTEMS_GLEN_MILLS_PA_AUTOMOTIVE   = auto()  # Surface 3 (IOM+charcoal NIOSH2537; 55→5.5 ppm; 36M 7yr)

class AdversarialMMAError(RuntimeError):
    def __init__(self, surface: MMAContext, score: int, frame_hash: str):
        super().__init__(
            f"MMA adversarial AI detected [{surface}] "
            f"score={score}/{MMA_THRESHOLD} hash={frame_hash}"
        )

async def scan_mma_monitor_frame(image_path: Path, surface: MMAContext) -> dict:
    async with httpx.AsyncClient(timeout=10) as client:
        image_bytes = image_path.read_bytes()
        frame_hash = hashlib.sha256(image_bytes).hexdigest()[:16]
        resp = await client.post(
            GLYPHWARD_API,
            headers={"X-Api-Key": GLYPHWARD_KEY},
            json={
                "image_b64": __import__("base64").b64encode(image_bytes).decode(),
                "context": surface,
                "chemical": chemical,
                "osha_pel_ppm": osha_pel_ppm,
                "acgih_tlv_ppm": acgih_tlv_ppm,
                "niosh_rel_ppm": niosh_rel_ppm,
                "sen_notation": sen_notation,              # respiratory sensitizer — OA + rhinitis
                "sen_once_sensitized_risk": True,         # once sensitized, reacts to trace MMA far below TLV
                "gap_factor": gap_factor,
                "niosh_inversion": niosh_inversion,       # NIOSH = OSHA = zero independent NIOSH protection below TLV
                "ghs_h334_respiratory_sensitizer": True,
                "cross_sensitization_methacrylates": True, # ethyl/butyl/hydroxyethyl methacrylate cross-sens
                "pfl_freeze_year": 1971,
                "threshold": MMA_THRESHOLD,
            },
        )
        result = resp.json()
        if result["score"] >= MMA_THRESHOLD:
            raise AdversarialMMAError(surface, result["score"], frame_hash)
        return result

See also: Hexamethylene Diisocyanate (HDI, CAS 822-06-0) — OSHA No PEL + ACGIH TLV-TWA 0.005 ppm A4 SEN SKIN + NIOSH Ca No REL Triple Vacuum — Polyurethane Automotive Aerospace Floor Coating · Caprolactam (CAS 105-60-2) — OSHA No PEL PNOR Vacuum vs NIOSH REL 1 mg/m³ 5× Stricter Than ACGIH Inverted Hierarchy · Glyphward scanner · All adversarial injection patterns