CarCareTruth Score
Decent, but wear gloves and ventilate.
Priced as of June 6, 2026
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 eye damage — classified as causing irreversible eye damage on contact.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
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From the manufacturer’s Safety Data Sheet, Section 8
“H318 (serious eye damage Cat 1) in SDS §2. Calcium oxide at mixture level drives this classification. Brush application with possible flick-splash; eye contact can cause permanent injury.”
— Loctite
U.S. regulatory standard
29 CFR 1910.133(a)(1); 1910.151(c)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals, acids or caustic liquids…”
ANSI Z87.1 (chemical splash protection — incorporated via §1910.6)
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“H315 (skin irritation Cat 2) and H317 (skin sensitizer Cat 1) in SDS §2. Petroleum-grease paste with sulfonate-class sensitizer chemistry; wash after use with soap and water.”
— Loctite
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“Paste format has no inhalation pathway during application. Thermal decomposition fumes possible on first heat cycle in service; ensure ventilation during initial drive cycle after applying to high-temperature hardware.”
— Loctite
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
This product ranks #1 of 6 in Anti-Seize Compound.
Last reviewed June 7, 2026
TL;DR Metal-free anti-seize rated to 2400°F: the right call for stainless exhaust studs and marine fasteners where copper pastes risk stress-corrosion cracking. DANGER signal word from H318 serious eye damage; wear safety goggles.
Loctite LB 8023 is a calcium sulfonate and graphite paste for spark plug threads, exhaust manifold studs, brake-caliper hardware, and marine fasteners. No copper, nickel, or aluminum flake. Apply a thin brush coat to the threads before assembly; the brush-in-cap applies the right amount without flooding nearby hardware. Owners confirm clean disassembly on marine and high-humidity applications, including stainless-to-aluminum assemblies that carry real risk with a copper paste. The 2400°F rating covers turbo housing bolts and extreme heat-cycle exhaust hardware that 1600°F mainstream products cannot.
Best for mechanics working on stainless exhaust, marine-environment fasteners, or any application where copper stress-corrosion risk is a concern. Skip it for routine spark plug or brake service if you want to avoid the DANGER-tier chemistry; an aluminum-based alternative (Permatex 81343) covers those jobs with a cleaner health profile.
SDS §2 classifies this paste DANGER from H318 (serious eye damage Cat 1), H317 (skin sensitizer), and H315 (skin irritation). Eye contact can cause permanent injury; wear safety goggles. H317 is from the calcium sulfonate and petroleum sulfonate chemistry at mixture level. The Prop 65 listing is tied to the petroleum residual oil carrier (SDS §15). The metal-free formula has no copper or nickel aquatic toxicity; dispose of contaminated wipes as automotive waste.
Yes. The 299175 number is the Henkel internal IDH (material) number for LB 8023 Marine Grade Anti-Seize. Both identifiers refer to the same product; the 299175 designation appears on Amazon and distributor listings while LB 8023 is the official Henkel product name.
Yes. The metal-free formula contains no copper or nickel, so there is no risk of the stress-corrosion cracking that copper anti-seize can cause on stainless at sustained high heat. The calcium sulfonate and graphite formula is recommended specifically for stainless and nickel-alloy fasteners per Henkel's TDS.
The label and Henkel TDS both specify an operating range of -20°F to 2400°F (-29°C to 1315°C). That is a meaningful thermal headroom above the 1600-1800°F range of most mainstream copper-based products, making it suitable for turbo housing hardware, catalytic converter bolts, and other extreme-heat fasteners.
The DANGER classification comes from H318 (serious eye damage Cat 1) in SDS §2. Calcium oxide in the formula drives this at mixture level; eye contact with the paste can cause permanent injury. The signal word is not from a flammability or explosion hazard. Wear safety goggles when applying. The label's wording about skin burns is older pre-GHS language; the GHS classification is H315 skin irritation (not corrosion).
Henkel's documentation does not specifically approve or exclude oxygen sensor threads. The metal-free formula avoids the sensor contamination risk that some metallic anti-seize compounds carry at high temperatures. Confirm with your vehicle or sensor manufacturer, and apply sparingly; excess paste migrating into the sensor bore can cause issues.
Marketing copy from Loctite, via Amazon. Not editorial.
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