Poly/Bed® 502 Resin is a modified epoxy resin used in embedding formulations for microscopy specimen preparation. Commonly associated with Araldite 502 embedding systems, the resin contains a nonreactive diluent that increases the resiliency of the cured embedding block.
The weight per epoxide equivalent (WPE) is used to calculate the appropriate amount of anhydride hardener for a stoichiometrically balanced formulation. Poly/Bed® 502 Resin has a WPE range of 233–250, with the exact value identified for each lot.
When used with dodecenylsuccinic anhydride (DDSA) or nadic methyl anhydride (NMA), the lot-specific WPE helps determine the hardener quantity needed per 100 grams of resin. Accurate formulation supports consistent curing and reproducibly stainable embedding blocks.
Key Properties
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Product number: 00552
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Product name: Poly/Bed® 502 Resin
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Related name: Araldite 502 resin
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Material type: Modified epoxy embedding resin
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Weight per epoxide equivalent: WPE 233–250
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WPE documentation: Exact lot-specific value appears on the product container
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Compatible anhydride hardeners: DDSA or NMA in appropriate embedding formulations
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Functional characteristic: Contains a nonreactive diluent that increases cured-block resiliency
Applications
Electron Microscopy Embedding
Poly/Bed® 502 Resin is used in epoxy embedding formulations for preparing specimens for electron microscopy. The cured resin supports sectioning and examination of resin-embedded specimens.
Biological Specimen Preparation
The resin may be combined with an anhydride hardener and accelerator according to an established embedding protocol. Fixation, dehydration, infiltration, formulation, and curing conditions should be selected for the specimen and microscopy workflow.
Araldite 502 Embedding Formulations
Poly/Bed® 502 Resin is relevant to laboratory workflows that use Araldite 502-type epoxy embedding formulations. The exact component ratios depend on the resin’s lot-specific WPE and the selected hardener.
WPE & Formulation Considerations
WPE means weight per epoxide equivalent. This value is used to determine the amount of DDSA or NMA required for stoichiometric balance with 100 grams of resin.
- Use the exact WPE value shown on the container when calculating formulation ratios.
- Do not calculate the hardener quantity from the general WPE range when a lot-specific value is available.
- Follow a validated embedding formula for the selected hardener and accelerator.
- Mix components thoroughly while minimizing air incorporation.
- Evaluate infiltration and cure conditions for the specific specimen and sectioning requirements.
Incorrect resin-to-hardener ratios may leave unreacted components and affect polymerization, block consistency, sectioning, or staining performance.
Handling & Storage
Keep the container securely closed and prevent contamination during resin preparation. Work with appropriate ventilation and wear protective gloves, eye protection, and suitable laboratory clothing. Review the current product label and Safety Data Sheet before handling, mixing, curing, storage, or disposal.
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FAQ
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1. What is Poly/Bed® 502 Resin used for?
Poly/Bed® 502 Resin is used in epoxy embedding formulations for microscopy specimen preparation. It may be combined with an anhydride hardener and accelerator according to an established embedding procedure.
2. Is Poly/Bed® 502 Resin related to Araldite 502?
Yes. Poly/Bed® 502 Resin is associated with Araldite 502-type epoxy embedding formulations and is commonly searched for as Araldite 502 resin.
3. What does WPE mean for epoxy resin?
WPE means weight per epoxide equivalent. It is used to calculate the amount of anhydride hardener needed to achieve stoichiometric balance with a specified mass of epoxy resin.
4. What is the WPE of Poly/Bed® 502 Resin?
The WPE range is 233–250. Because the exact value varies by lot, use the lot-specific WPE shown on the product container for formulation calculations.
5. Why is the lot-specific WPE important?
The lot-specific WPE determines the appropriate quantity of DDSA or NMA to combine with 100 grams of resin. Using the exact value supports stoichiometric balance and consistent curing.
6. Can Poly/Bed® 502 Resin be used with DDSA or NMA?
Yes. DDSA and NMA are anhydride hardeners used with this resin in appropriate embedding formulations. The required quantity depends on the exact WPE and the selected protocol.
7. Does Poly/Bed® 502 Resin contain a diluent?
Yes. The modified epoxy resin contains a nonreactive diluent that increases the resiliency of the cured embedding block.
8. How should Poly/Bed® 502 Resin be handled?
Use appropriate ventilation, protective gloves, eye protection, and suitable laboratory clothing. Review the current Safety Data Sheet before mixing, curing, storage, or disposal.
Safety & Documentation
Epoxy resins and embedding-formulation components require appropriate chemical handling procedures. Avoid skin and eye contact, use adequate ventilation, and prevent contamination during preparation.
Review the current Safety Data Sheet and product specifications before use. Follow applicable institutional procedures for personal protective equipment, mixing, curing, spill response, storage, and disposal.
