OT-157TN Alternative: Why Aerospace Engineers Are Switching to E&H 743-MT
Aerospace Tapes · Insulation Blanket Tape · BMS 5-157
If you spec Orcotape OT-157TN for aircraft insulation blanket fabrication, you already know what it does. What you may not know is that there's a direct substitute that beats it on peel strength, publishes actual flammability numbers instead of just "Pass," and carries a Gulfstream approval OT-157TN doesn't list. That substitute is E&H 743-MT.
What Is OT-157TN?
OT-157TN is Orcon Aerospace's dull gray metalized PVF (Tedlar) insulation blanket tape — one of the most widely distributed Comp MPVF tapes in commercial and military aviation. It meets Boeing BMS 5-157 Types I, III, and IV, carries DMS 1984 Type 6 Class 2 for legacy aircraft, and is stocked at major aerospace distributors with no lead time. For years it's been the default choice when a procurement officer needs gray metalized PVF tape and needs it fast.
But "widely available" and "best performing" aren't the same thing.
Where E&H 743-MT Pulls Ahead
1. Peel strength — 28% above OT-157TN's published minimum
OT-157TN publishes a room-temperature peel strength minimum of 2.5 lb/in. E&H 743-MT delivers 3.2 lb/in — 28% higher. But that's just one data point. E&H also publishes peel strength at −65°F, 120°F/100% RH, and 160°F. OT-157TN publishes none of those. If your program requires multi-temperature peel data for material qualification, only one of these tapes can give it to you.
2. Quantified flammability — not just "Pass"
OT-157TN's data sheet says it passes FAR 25.853, FAR 25.856(A), and BSS-7230. What it doesn't tell you is the burn length, flame time, or drip behavior. E&H 743-MT gives you the numbers: 1.9 inches maximum burn length, 0-second flame time, no drips. For programs where the DER or quality team wants actual measured values — not just a pass/fail — this matters.
3. Gulfstream GAT100FR1 approval
E&H 743-MT carries Gulfstream GAT100FR1 approval. OT-157TN does not list this approval. If you're fabricating insulation blankets for Gulfstream business jets, E&H 743-MT isn't just a good alternative — it may be the only approved option for your program.
4. Lighter weight
E&H 743-MT weighs 3.0 oz/sq yd maximum. OT-157TN weighs 3.3 oz/sq yd maximum. That 0.3 oz/sq yd difference adds up across a full aircraft's worth of insulation blankets, contributing to weight-reduction goals without any performance tradeoff.
Where OT-157TN Still Wins
To be direct: OT-157TN has real advantages you should weigh. It covers Boeing BMS 5-157 Types I, III, and IV — E&H 743-MT is listed for Type I only. It carries DMS 1984 Type 6 Class 2 for Douglas/Boeing legacy aircraft, and NASA-KSC Group 1 for space applications. Its 60-month shelf life (vs. E&H's 18-month minimum) makes it better suited for long-term MRO stockpiling. And it's in stock at major distributors with no lead time, while E&H 743-MT requires a 1–2 week lead time.
If you need Type III or IV, DMS 1984, NASA approval, or immediate availability, OT-157TN is the right call. But for Gulfstream programs, documentation-heavy qualifications, or anywhere you need the best peel and flammability data, E&H 743-MT is the stronger product.
Both Are BMS 5-157 Comp MPVF — They're Direct Substitutes
It's worth being clear: these are not close alternatives or "similar products." Both are dull gray metalized PVF tapes meeting Boeing BMS 5-157 Comp MPVF for the exact same insulation blanket fabrication and installation applications. The substitution is spec-for-spec. The question is which one performs better for your specific program requirements — and on the data that matters most, E&H 743-MT wins.
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View Full Comparison →About E&H Laminating & Slitting Company
E&H Laminating & Slitting Company is a Paterson, NJ manufacturer specializing in aircraft insulation blanket tapes. Their products are used by insulation blanket fabricators and MRO facilities on commercial, business, and military aircraft worldwide. All E&H products carry a 1–2 week lead time.
Always verify current approval status against the applicable Boeing BMS, Gulfstream, or OEM specification revision in force at time of purchase.