The B3000-CAP-HTC is the high-temperature replacement cap in the hybex Media Storage Bottle accessory family — 10 caps per pack at $184 ($18.40 per cap, 4.4× the cost of the standard PP B3000-CAP at $4.20). The cap is manufactured from PBT (polybutylene terephthalate) instead of standard PP (polypropylene) — extending the maximum operating temperature from ~120 °C (PP) to 180 °C (PBT). The red color-coding distinguishes high-temp caps from standard blue caps in facility inventory at-a-glance.
Key Specifications
| SKU | B3000-CAP-HTC |
| Type | High-temperature replacement cap |
| Material | PBT (polybutylene terephthalate) — high-temperature engineering plastic |
| Maximum temperature | 180 °C (vs ~120 °C for standard PP caps) |
| Cap thread | GL45 (standard hybex large-bottle thread) |
| Cap color | Red (color-coding distinguishes from standard blue caps) |
| Pack quantity | 10 caps per pack |
| Per-cap cost | $18.40 |
| Compatible bottles | All GL45 hybex bottles (100–10,000 mL range) — same fitment as standard B3000-CAP |
| Sister standard cap | B3000-CAP (standard PP blue cap, ~120 °C max, $42 / 10pk) |
| List price | $184 |
Why PBT High-Temperature Material
Standard PP (polypropylene) caps soften and deform above ~120 °C — fine for brief autoclave use (typically 121 °C), but inadequate for dry-heat sterilization at higher temperatures (160–180 °C, common for glassware), high-temperature reactions with bottle exposure (oil-bath workflows, high-temp chemistry), aggressive extended-cycle autoclave protocols, and other process workflows exposing bottles to elevated temperatures.
PBT (polybutylene terephthalate) is an engineering thermoplastic with substantially higher heat-deflection temperature than PP — handles 180 °C continuous operating temperature without deformation. The premium material cost is the procurement trade-off for the temperature capability.
Pick the high-temp cap (B3000-CAP-HTC) when:
- Workflow involves dry-heat sterilization above ~120 °C (160–180 °C cycles for bottle sterilization)
- Oil-bath or high-temperature chemistry workflows with bottle exposure above PP cap temperature
- Pharmaceutical / clinical workflows with aggressive sterilization protocols
- Color-coded high-temp inventory differentiation is part of facility safety / quality standard
Pick the standard B3000-CAP for routine ≤120 °C autoclave-only workflows — the $4.20 cap is more cost-efficient when high-temp capability isn't required.
Cap Material / Temperature Decision Matrix
| Process temperature | Recommended cap |
| Routine autoclave (~121 °C, brief cycles) | B3000-CAP (standard PP, $4.20/cap) |
| Extended autoclave (>121 °C or extended cycles) | B3000-CAP-HTC (this product, PBT, $18.40/cap) |
| Dry-heat sterilization (160–180 °C) | B3000-CAP-HTC (this product) |
| Oil-bath / high-temperature reactions | B3000-CAP-HTC (this product) |
| Cold storage / room temperature | B3000-CAP (standard PP) |
Application Profile
Dry-heat glassware sterilization — pharmaceutical / clinical workflows using dry-heat ovens at 160–180 °C for glassware sterilization where bottles are sterilized with caps in place.
High-temperature oil-bath reactions — chemistry / biology workflows where bottles sit in heated oil baths exceeding PP cap temperature.
Aggressive autoclave protocols — pharmaceutical / biotech sterilization workflows with extended-cycle or higher-temperature autoclave protocols.
Pharmaceutical / clinical bottle inventory — facilities standardizing on PBT caps for high-stakes sterilization workflows.
Color-coded inventory differentiation — facilities organizing high-temp vs standard cap inventory by color (red high-temp vs blue standard).
Method-development workflows — protocol-development for high-temperature processes requiring cap-temperature compatibility.
Multi-investigator shared facility — high-temp cap inventory for shared workflows where individual investigators may not know cap temperature requirements.
Ordering & Configuration
Confirm process temperature requirement. Many workflows assumed to need "high-temp" caps actually run at ≤121 °C (standard autoclave) — confirm actual process temperature before paying the PBT premium.
Confirm color-coding plan. Red caps vs blue caps differentiation supports facility safety / quality standards — confirm color-coding policy at order.
Plan for ongoing replacement cycle — high-temp caps are durable but still wear with use; plan periodic replacement at facility scale.
Confirm at quote: process temperature requirement (vs standard PP cap), color-coding plan, autoclave / dry-heat protocol, and lead time.
Warranty: Per Benchmark Scientific standard consumable terms.
hybex replacement cap family — material / temperature decision:
- B3000-CAP — standard PP, ~120 °C max, blue ($4.20/cap)
- B3000-CAP-HTC (this product) — PBT high-temp, 180 °C max, red ($18.40/cap)
- B3000-CAP2 — standard PP GL32 ($4.10/cap, B3000-50 only)
Pick the high-temp PBT cap for dry-heat sterilization, oil-bath workflows, and aggressive autoclave protocols; standard PP cap for routine ≤120 °C workflows. See B3000-CAP anchor for full replacement-cap workflow detail.
