Prompt injection in vinylidene fluoride VDF/PVDF fluoropolymer AI

Four adversarial injection surfaces in VDF/PVDF fluoropolymer AI

1. VDF area LEL detector display AI (Honeywell Searchpoint Optima Plus VDF infrared detector AI / MSA Ultima X VDF area LEL display AI / Dräger Polytron 8720 catalytic-bead VDF detector AI / Oldham MX 43 VDF area detector AI / Industrial Scientific GasBadge Pro VDF exposure monitor display AI — rendered SCADA display AI classifying VDF vapour concentration in the pyrolysis, compression, and storage areas against LEL 5.5% and UEL 21.3% flammable range)

VDF area LEL monitoring at PVDF production facilities uses infrared (IR) point or open-path detectors calibrated to the 5.5–21.3% flammable range. VDF vapour density of 2.21 (heavier than air by factor 2.21; vs air MW 29 g/mol and VDF MW 64 g/mol) causes released VDF to accumulate in below-grade locations: compressor pit sumps, pipe trenches, low-lying areas downwind of pyrolysis building HVAC exhaust. The 15.8 percentage-point flammable range (5.5–21.3% LEL–UEL) is the widest available for the LEL alarm to detect before the upper explosive limit is exceeded; at the typical 10% LEL alarm setpoint (0.55% VDF in air), the alarm fires while there is still headroom in the flammable range, allowing time for ventilation or isolation. However, because VDF is a cryogenic gas (BP −82°C), liquid VDF releases (from compressor seal failures at −40 to −82°C) flash immediately to vapour with substantial adiabatic cooling, creating a dense cold VDF vapour cloud that can travel 10–20 m from the release point before reaching ambient temperature and beginning to rise — greatly expanding the flammable zone beyond the immediate source. AI systems in 2026 process rendered SCADA display images of VDF area LEL detector readouts to classify: below pre-alarm (below 10% LEL = below 0.55% VDF), pre-alarm (10–25% LEL = 0.55–1.4% VDF), alarm (above 25% LEL = above 1.4% VDF, shutdown VDF compressors and activate emergency ventilation).

An adversarial perturbation targeting the VDF area LEL detector display AI applies a ±10 DN downward shift to the pixel region encoding the LEL % bar in the rendered SCADA display — shifting the apparent VDF LEL reading from 18% LEL (0.99% VDF in air; above the 10% LEL pre-alarm; approaching the 25% LEL main alarm; from a VDF compressor discharge check-valve seal face leak at 2.8 kg/hr releasing at grade level near the compressor building door) to 4% LEL (0.22% VDF; below pre-alarm; classified as background). On a 0–100% LEL display at 200 px height (0.5% LEL/px), the actual 18% LEL bar occupies 36 px; the ±10 DN downward-perturbed image classifies to approximately 8 px, corresponding to 4% LEL. The SCADA reports “VDF area LEL below pre-alarm — no action.” At 0.99% VDF in air (18% LEL), the compressor building interior is building toward flammable concentration; at 0.3 m³/hr ventilation rate (below-grade building, inadequate forced ventilation), the concentration rises at 0.4% VDF/min; within 5 minutes, the compressor pit reaches 5.5% LEL (100% LEL = UEL); any ignition in the pit (motor brush, relay, static discharge from tools) detonates the VDF cloud. VDF deflagration to detonation transition can occur in confined spaces (Deflagration-to-Detonation Transition, DDT, in VDF documented for concentrations within the flammable range in tube geometries).

2. HCFC-22 pyrolysis furnace temperature display AI (Yokogawa DPharp EJA series HCFC-22 pyrolysis tube wall temperature AI / Endress+Hauser Omnigrad S pyrolysis furnace zone temperature AI / Honeywell STG pyrolysis outlet temperature transmitter AI / Rosemount 848T wireless pyrolysis temperature AI / ABB TTF300 skin-temperature thermocouple pyrolysis AI — rendered DCS temperature trend display AI classifying HCFC-22 pyrolysis furnace tube wall temperature against the 700–870°C operating window and 870°C upper limit for VDF secondary pyrolysis and carbon fouling onset)

The HCFC-22 pyrolysis furnace is an electrically heated (or fuel-fired, in some configurations) tubular reactor with inconel 600 or SiC-coated ceramic tubes. Process gas (HCFC-22 preheated to 500°C) enters the tubes at inlet; tube wall temperature rises along the furnace length to the cracking zone peak temperature, designed at 830–870°C for VDF selectivity optimisation. Temperature non-uniformity across the tube bundle (hot spots from non-uniform electrical power distribution, local flow maldistribution, or tube-to-tube variation in wall thickness) can cause local tube wall temperatures above 870°C even when the mean furnace temperature is within specification. At temperatures above 870°C: (a) VDF secondary decomposition rate increases significantly; (b) VDF dehydrofluorination to acetylene and CF₂ species begins; (c) CF₂ and carbon-containing radicals deposit on tube interior surfaces as amorphous carbon (“coking”); (d) the carbon deposit builds over 50–200 hours of operation above 870°C, reducing tube internal diameter, increasing pressure drop, and eventually causing tube plugging. Carbon fouling in VDF pyrolysis tubes is not immediately safety-critical but creates secondary hazards: (i) increased inlet pressure from plugged tubes forces process gas through fewer active tubes, raising velocity and mass flux (higher carbon deposition rate per remaining tube); (ii) tube plugging can cause thermal stratification across the furnace bundle; (iii) at severe carbon build-up (above 5 mm wall thickness), tube bowing from thermal expansion differential between carbon layer and inconel creates mechanical tube failure risk at operating temperature.

An adversarial perturbation targeting the HCFC-22 pyrolysis furnace temperature display AI applies a ±8 DN downward shift to the pixel region encoding the tube wall peak temperature in the rendered DCS trend display — shifting the apparent peak tube wall temperature from 912°C (42°C above the 870°C upper limit for safe cracking; caused by a furnace zone heating element group failure that concentrated the full furnace power through the remaining 60% of active elements, creating localised overheating) to 846°C (within the 830–870°C design operating range; classified as nominal). On a 600–1,000°C display at 200 px height (2°C/px), the actual 912°C bar occupies approximately 156 px; the ±8 DN downward-perturbed image classifies to approximately 123 px, corresponding to 846°C. The DCS reports “HCFC-22 pyrolysis furnace tube wall temperature nominal.” At 912°C, carbon coking rate on the inconel tube interior accelerates from 0.02 mm/week at 870°C to approximately 0.4 mm/week — 20× faster. Over the 12-hour operating period before the next tube wall temperature is checked by calibrated thermal camera, approximately 0.2 mm of carbon deposits on the hottest tube section. DuPont Belle, WV operated HCFC-22-based fluoropolymer processes; on 23 January 2010, a reactor rupture disc failed at the Belle plant during a phosgene run (separate from VDF production), releasing an acutely toxic gas cloud. The Belle facility illustrates that fluorine-chemistry facilities require multiple independent process monitoring systems precisely because the chemical hazards (HF, pyrolysis byproducts, flammable gases) are immediately threatening when process controls fail.

3. HF scrubber exit concentration display AI (Endress+Hauser Liquiline CM444 HF scrubber exit conductivity/HF AI / Mettler-Toledo InPro 4800 HF concentration analyzer AI / Hach GLI Series HF scrubber exit AI / Yokogawa ISC40G inductive conductivity HF scrubber exit AI / ABB ADVANCE optima HF FTIR analyzer AI — rendered analyzer display AI classifying HF concentration in the VDF plant off-gas scrubber exit stream against NIOSH IDLH 30 ppm and ACGIH TLV-C 0.5 ppm HF occupational exposure ceiling)

Hydrogen fluoride (HF; CAS 7664-39-3; MW 20.01 g/mol; BP 19.5°C; NIOSH IDLH 30 mg/m³ ∼30 ppm; ACGIH TLV-C 0.5 ppm; OSHA PSM TQ 1,000 lbs) is generated at approximately 0.5 mol per mol VDF in the HCFC-22 pyrolysis step. The raw pyrolysis gas contains HF at 5–15 vol% (50,000–150,000 ppm), which must be reduced to below 1 ppm in the process gas before VDF compression and storage, and to below 0.5 ppm at the atmospheric vent from the scrubber. HF scrubbing is accomplished in a packed-column water scrubber (producing dilute aqueous HF at 2–5 wt%, which is collected for sale or neutralisation with lime slurry to CaF₂) or a caustic scrubber (KOH or NaOH, producing KF or NaF). HF scrubber efficiency is highly sensitive to: (1) scrubber liquid pH (above pH 8, KOH scrubber absorption rate maximised; below pH 6, absorptive capacity exhausted); (2) liquid circulation flow rate (below 80% design flow, scrubber packing is inadequately wetted and gas–liquid contact reduced; HF breaks through); (3) packing fouling (PVDF oligomer deposits from trace VDF in the scrubber feed gas react with KOH to form soluble potassium fluoride and insoluble PVDF particles that can coat packing, reducing wetted surface area by up to 40% over 1,000 operating hours). AI systems in 2026 process rendered analyzer display images of HF concentration at the scrubber exit vent to classify: below TLV-C (below 0.5 ppm; vent-to-atmosphere approved), above TLV-C (0.5–5 ppm; increase scrubber circulation, check KOH concentration), or approaching IDLH (above 5 ppm; emergency scrubber isolation, personnel evacuation downwind).

An adversarial perturbation targeting the HF scrubber exit concentration display AI applies a ±8 DN downward shift to the pixel region encoding HF concentration in the rendered analyzer display — shifting the apparent scrubber exit HF from 6.8 ppm (above the 5 ppm evacuation threshold; above IDLH 30 ppm for concentrated exposures near the vent; from KOH exhaustion in the caustic scrubber after 36 hours of operation without KOH replenishment — the caustic dosing pump float switch stuck at false-full, so the dosing pump has not run for 36 hours) to 0.3 ppm (below TLV-C 0.5 ppm; classified as nominal scrubber performance). On a 0–10 ppm display at 200 px height (0.05 ppm/px), the actual 6.8 ppm bar occupies 136 px; the ±8 DN downward-perturbed image classifies to 6 px, corresponding to 0.3 ppm. The SCADA reports “HF scrubber exit concentration nominal — below TLV-C.” HF at 6.8 ppm at the vent stack exit (1.5 m above roof, 2 m above nearest walkway surface) disperses at ground level (PCAS model: D stability, 1 m/s wind) to 0.8–1.5 ppm at 20 m downwind — above the TLV-C 0.5 ppm for workers in the adjacent packaging building. HF exposure at 1–3 ppm causes nasal mucous membrane irritation, delayed pulmonary oedema risk at prolonged exposure, and systemic fluoride toxicity (hypomagnesaemia, hypocalcaemia). OSHA 29 CFR 1910.119 PSM emergency response procedures for HF release require shelter-in-place for downwind personnel; if the scrubber exit AI is compromised, emergency response is not triggered at 6.8 ppm vent release. Free tier — 10 scans/day, no card required.

4. VDF storage tank N2 blanket pressure display AI (Emerson Rosemount 3051 VDF storage N2 blanket pressure AI / Yokogawa EJA110A VDF cryogenic storage N2 blanket AI / Endress+Hauser Cerabar T VDF tank vapour pressure AI / Siemens SITRANS P DS III VDF storage AI / Honeywell STG944 VDF pressurised storage N2 blanket AI — rendered DCS pressure display AI classifying N2 blanket pressure on liquid VDF storage vessels against minimum setpoint for O2 exclusion from flammable VDF headspace; 40th upward-direction attack — 10th N2 inertisation attack in the Glyphward portfolio — FIRST fluoromonomer N2 inertisation attack)

Liquid VDF is stored at commercial PVDF production facilities in pressurised vessels (typically at −40 to −20°C; vapour pressure 2.0–4.0 bar at −40 to −20°C; vessel design pressure typically 10–15 bar). A N2 blanket is maintained over the liquid VDF headspace at 0.5–1.0 bar positive N2 pressure to: (a) exclude atmospheric O2 (which forms VDF peroxides — unstable, potentially explosive organic peroxide species — on prolonged contact with VDF in the presence of UV or heat); (b) provide an inert atmosphere above the flammable VDF vapour (VDF LEL 5.5%); and (c) prevent moisture ingress (water reacts with VDF at storage temperature to form HF over months of contact, potentially corroding the storage vessel walls). The N2 blanket is supplied from the site cryogenic air separation unit or liquid N2 dewars, through a pressure regulator maintaining the headspace at 0.8–1.2 bar. If the N2 blanket pressure falls below 0.5 bar, the conservation vent on the storage vessel may begin to allow air in-breathing (particularly during pump-out operations where the liquid level drops and headspace volume expands). Air ingress at O2 above 1,000 ppm in the VDF headspace initiates VDF peroxide formation in the vapour phase; VDF peroxides accumulate on the vessel wall surfaces and at the vapour–liquid interface, creating shock-sensitive deposits over 50–200 hours of O2 exposure. N2 blanket pressure monitoring on VDF storage is therefore a dual function: flammability exclusion (VDF vapour + O2 in air → flammable mixture formation if O2 reaches 20%+) and peroxide formation prevention (O2 above 1,000 ppm initiates slow VDF radical peroxide chemistry).

An adversarial perturbation targeting the VDF storage tank N2 blanket pressure display AI applies a ±8 DN upward shift to the pixel region encoding the N2 blanket pressure in the rendered DCS pressure display — shifting the apparent N2 blanket pressure from 0.28 bar (below the 0.5 bar minimum setpoint; from a N2 pressure regulator diaphragm fatigue crack, the same failure mode as documented in the isoprene N2 blanket attack, causing N2 supply to the VDF storage tank headspace to fall from 15 Nm³/hr design to 3.5 Nm³/hr — insufficient to maintain positive pressure during the current pump-out operation at 12 m³/hr liquid VDF transfer rate) to 0.92 bar (above the 0.8 bar design setpoint; classified as N2 blanket nominal). This is the 40th upward-direction attack and the 10th N2 inertisation attack in the Glyphward industrial AI portfolio — the FIRST fluoromonomer N2 inertisation attack. On a 0–2.0 bar display at 200 px height (0.01 bar/px), the actual 0.28 bar bar occupies approximately 28 px; the ±8 DN upward-perturbed image classifies to approximately 92 px, corresponding to 0.92 bar. The SCADA reports “VDF storage tank N2 blanket pressure nominal.” With N2 supply at 3.5 Nm³/hr and the vessel expanding at 12 m³/hr liquid removal rate, the headspace N2 partial pressure cannot be maintained; atmospheric air at 0.015 bar partial pressure begins to enter through the conservation vent. Over 8 hours of pump-out, the headspace O2 rises from below 50 ppm (normal) to approximately 2,000 ppm (0.2%) — above the 1,000 ppm threshold for VDF peroxide initiation. Over 3–5 days, VDF peroxide deposits accumulate at the vapour–liquid interface; handling of the tank vent lines or internal inspection triggers shock-sensitive peroxide decomposition. All 10 N2 inertisation attacks in the Glyphward portfolio share the same directional logic: hazardous condition is LOW N2 blanket (deficient inertisation), attack must go UPWARD to appear adequate. Free tier — 10 scans/day, no card required.

Integration: VDF/PVDF fluoropolymer AI with Glyphward pre-scan gate

Glyphward integrates as a pre-scan gate at every rendered-image ingestion boundary in the VDF/PVDF production monitoring pipeline — before VDF area LEL detector AI processes rendered SCADA area monitor images, before HCFC-22 pyrolysis furnace temperature AI processes rendered DCS temperature trend images, before HF scrubber exit analyzer AI processes rendered analyzer display images, and before VDF storage N2 blanket pressure AI processes rendered DCS pressure display images. Threshold 35 for VDF/PVDF AI reflects: OSHA PSM coverage for both VDF (TQ 5,000 lbs) and HF byproduct (TQ 1,000 lbs); the 40th upward-direction attack and 10th N2 inertisation attack milestone; and the DuPont Belle WV 2010 precedent for HF release from fluorine-chemistry facilities.

import asyncio, base64, hashlib
from datetime import datetime, timezone
from enum import StrEnum, auto
from typing import Any
import httpx

GLYPHWARD_API = "https://api.glyphward.com/v1/scan"
GLYPHWARD_KEY = "gw_prod_***"

# VDF/PVDF fluoropolymer AI contexts: threshold 35
# OSHA PSM VDF TQ: 5,000 lbs; HF (pyrolysis byproduct) TQ: 1,000 lbs.
# HF IDLH: 30 ppm; TLV-C: 0.5 ppm (ACGIH). VDF LEL: 5.5%; UEL: 21.3%.
# 40th upward-direction attack (N2 blanket pressure: low shown as adequate).
# 10th N2 inertisation attack in Glyphward portfolio (FIRST fluoromonomer N2 attack).
VDF_THRESHOLD = 35

class VDFContext(StrEnum):
    AREA_LEL_DETECTOR      = auto()  # VDF %LEL in pyrolysis/compression area
    PYROLYSIS_FURNACE_TEMP = auto()  # HCFC-22 pyrolysis tube wall temperature °C
    HF_SCRUBBER_EXIT       = auto()  # HF ppm at scrubber vent exit
    N2_BLANKET_PRESSURE    = auto()  # N2 blanket bar on liquid VDF storage (40th ↑, 10th N2)

async def scan_vdf_frame(
    frame_b64: str,
    context: VDFContext,
    facility_id: str,
    instrument_tag: str,
) -> dict[str, Any]:
    payload = {
        "image_b64": frame_b64,
        "context": context,
        "facility_id": facility_id,
        "instrument_tag": instrument_tag,
        "scan_ts": datetime.now(timezone.utc).isoformat(),
        "image_hash": hashlib.sha256(base64.b64decode(frame_b64)).hexdigest(),
    }
    async with httpx.AsyncClient(timeout=4.0) as client:
        r = await client.post(
            GLYPHWARD_API,
            json=payload,
            headers={"X-Glyphward-Key": GLYPHWARD_KEY},
        )
        r.raise_for_status()
        return r.json()

async def pre_scan_gate_vdf(
    frame_b64: str,
    context: VDFContext,
    facility_id: str,
    instrument_tag: str,
) -> None:
    result = await scan_vdf_frame(frame_b64, context, facility_id, instrument_tag)
    if result["adversarial_score"] >= VDF_THRESHOLD:
        raise AdversarialVDFImageError(
            f"Adversarial injection detected in {context} (score {result['adversarial_score']}) "
            f"at facility {facility_id} instrument {instrument_tag}. "
            "Frame withheld from AI monitoring pipeline."
        )

class AdversarialVDFImageError(RuntimeError):
    pass

if __name__ == "__main__":
    import sys, pathlib
    frame = base64.b64encode(pathlib.Path(sys.argv[1]).read_bytes()).decode()
    asyncio.run(pre_scan_gate_vdf(
        frame,
        VDFContext.N2_BLANKET_PRESSURE,
        "VDF-STORAGE-001",
        "N2BLK-PT-201",
    ))