The list of things you cannot put in a casket is actually short, but it matters: a handful of items create explosion risks during cremation, damage crematory or cemetery equipment, violate environmental rules, or cause practical problems at the graveside. What not to put in a casket depends on whether you’re planning cremation, a conventional burial, or a certified green burial, because each has its own restrictions.
Items That Must Be Kept Out of a Cremation Casket
The strictest rules apply to cremation, and most of them exist because of heat.
Battery-powered medical implants top the list. Pacemakers and implantable defibrillators contain lithium-iodine batteries that rupture violently at cremation temperatures, and the damage is well documented: a survey of crematoria that reported pacemaker incidents found 42 percent suffered damage to doors or brickwork, and in 3 percent of cases the chamber itself was damaged beyond repair.1PubMed Central. Pacemaker Explosions in Crematoria: Problems and Possible Solutions Most heart devices are removed by a mortician or pathologist before cremation, though some newer leadless pacemakers can be left in place.2Medtronic. Should a Heart Device Be Removed Prior to Cremation? Deep brain stimulators and other battery-powered implants also need to come out. The Cremation Association of North America’s model law places the duty to disclose any such implant on the person authorizing the cremation.3Cremation Association of North America. Model Cremation Law and Explanation
Radioactive seed implants used in prostate cancer are a less obvious hazard. If the patient dies within about 20 months of the implant, iodine-125 seeds can still be active enough to contaminate the remains. Cremation can proceed, but the operator needs to take specific precautions, and scattering should wait until 20 months have passed from the implant date.4PubMed Central. Radiation Safety Issues Regarding the Cremation of the Body of an I-125 Prostate Implant Patient Tell the funeral home about any radiation treatment the deceased received.
Pressurized containers are a straightforward hazard. Aerosol cans, oxygen canisters, and similar sealed vessels rupture at cremation temperatures and become projectiles inside the chamber. Ammunition does the same, and can damage the retort lining or injure staff.
Consumer electronics are the newer concern. Phones, tablets, e-readers, and even musical greeting cards contain lithium batteries that behave much like a pacemaker battery when heated. If you want a favorite device cremated with a loved one, remove the battery first or ask the funeral director for help.
Items That Damage Cremation Equipment or Air Quality
Some items won’t explode but will still cause problems.
Large metal objects can partially melt and fuse to the chamber lining. Small items like wedding rings or eyeglass frames generally survive and are separated out afterward. Gold and platinum stay intact because their melting points sit above typical cremation temperatures, but silver and steel jewelry can deform or discolor, and pieces containing lead or cadmium can release contaminants. Many families remove meaningful jewelry beforehand rather than risk losing it.
Plastics in large quantities release toxic compounds including dioxins and furans when burned. A few small plastic parts in a casket or urn won’t shut the process down, but filling a casket with plastic-wrapped memorabilia or synthetic fabrics adds up, and crematories operate under Clean Air Act permit limits.5U.S. Environmental Protection Agency. Tribal Minor New Source Review Permit – Heggie’s Colonial Funeral Home
Thick glass, like a vase or decorative orb, melts and can stick to the chamber walls. Thin glass from eyeglasses or a small picture frame is generally fine.
What Green Burial Sites Will Not Allow
If you’ve chosen a certified green or natural burial, the list of prohibited items is much longer. These grounds exist to let the body return to the earth without interference, and the Green Burial Council’s certification standards require that burial containers, shrouds, and anything placed with the body be made entirely of natural, biodegradable materials.6Green Burial Council. Burial Cemetery Certification Standards That single rule eliminates a lot of conventional funeral products.
- No plastics, acrylics, or similar synthetic polymers in the casket, shroud, or any item placed with the body.7Green Burial Council. Offering Green Burial Options in Your Hybrid Cemetery
- No concrete vaults or grave liners, including partial or inverted vault lids.
- No conventional metal casket hardware, handles, hinges, or decorative metalwork.
- No photographs mounted under glass, battery-powered items, artificial flowers, or similar non-biodegradable keepsakes.
Shrouds, if used, should be natural fibers like cotton, linen, or wool. Individual burial grounds can add their own rules on top of the Council’s standards, so confirm with the specific site before planning around any particular item.
Items That Cause Practical Problems in Any Casket
Some items aren’t banned outright but will draw a warning from the funeral director.
Perishables cause more trouble than families expect. Food, fresh flowers, or anything organic placed in a sealed casket will decompose, and a sealed metal casket traps moisture and gases that accelerate the problem. Dried flowers hold up far better. Liquids of any kind risk leaking and staining the casket interior or clothing.
Oversized or heavy objects can also create logistical headaches. Caskets have weight limits, and anything that makes the casket awkward to carry or too heavy for the lowering device at the cemetery becomes a problem during the service.
Valuables are discouraged for practical reasons rather than legal ones. Caskets are not secure. Between the funeral home, transport, the service, and burial, multiple people handle the casket, and theft does occur. If a watch or piece of jewelry has sentimental value, consider placing an inexpensive replica inside and keeping the original in the family.
What You Can Safely Include
Compared with the prohibited list, the range of acceptable items is wide. For a standard burial, families commonly include photographs, handwritten letters, prayer cards, rosaries, military medals, small books, and favorite clothing. Small stuffed animals, drawings from grandchildren, and similar lightweight tokens are routine.
For cremation, the same items are fine as long as you avoid anything with a battery, pressurized seal, or large metal or glass component. Paper, natural fabric, dried flowers, and small wooden items burn cleanly. When in doubt, ask the funeral director. They’ve heard every version of the question and would rather suggest a safe alternative than discover the problem inside the chamber.