Mylar Jacket Protectors and Book Care: The Complete Preservation Guide

The difference between a collection that appreciates over decades and one that deteriorates is maintenance — specifically, the daily practices of storage, handling, and protection that prevent the slow degradation that turns Fine books into Very Good ones. The most important single tool in book preservation is the Mylar jacket protector: a clear, archival-quality sleeve that shields the dust jacket from handling wear, atmospheric pollutants, and accidental damage. This guide covers everything from basic protector installation through advanced conservation practices.

Mylar Jacket Protectors: The Essential Tool

What They Are

Mylar jacket protectors (also called dust jacket covers, Brodart covers, or jacket protectors) are clear sleeves made from archival-grade polyester film (Mylar D or equivalent) that wrap around the dust jacket, protecting it from fingerprints, rubbing, atmospheric pollutants, and light moisture. They are the single most cost-effective preservation investment available to collectors.

Types of Protectors

The rule: Use only Mylar D, Melinex 516, or archival polypropylene. Never use PVC/vinyl — it releases hydrochloric acid as it degrades, which will damage the jacket it’s supposed to protect.

Sizing Guide

Protectors come in standard heights. Measure your book’s height to select the correct size:

Width: Most protectors are designed for standard book widths and include fold-over flaps. For very thick books (>2”), look for “wide” protector variants.

Installation

1. Remove any existing non-archival covering (cellophane tape, rubber bands, etc.)
2. Slide the protector over the jacket with the book inside
3. Fold the excess material over the top and bottom edges of the jacket
4. Tuck the flaps inside the front and rear covers
5. The protector should fit snugly but not tightly — it should be easy to slide off when needed

Do NOT tape the protector to the jacket. The protector should be removable without affecting the jacket.

Suppliers

Shelving and Storage

Proper Shelving

• Upright storage with books standing vertically, supported by neighbors or bookends
• Same-height grouping: Books of similar height shelved together prevent smaller books from leaning against larger ones (which causes warping)
• Not too tight, not too loose: Books should slide in and out without force, but not lean or fall
• Away from exterior walls: Temperature fluctuation is greatest near exterior walls
• Away from heat sources: Radiators, heating vents, and sunny windows are enemies

What NOT to Do

• Never shelve books with the spine up (pages fall toward spine, loosening binding)
• Never lean books at angles (causes spine warping and uneven jacket wear)
• Never stack heavy books on top of jacketed books (crushes jackets)
• Never use rubber bands to hold books together (rubber deteriorates and stains)
• Never store books in cardboard boxes long-term (acidic cardboard off-gasses)

Climate Control

The enemies of books are light, humidity, temperature extremes, and air pollutants:

The humidity problem: Humidity fluctuation is more damaging than consistent high or low humidity. The expansion and contraction cycle cracks bindings, loosens adhesives, and warps boards. If you can’t maintain stable humidity, use a dehumidifier (in humid climates) or humidifier (in arid climates) in the room where books are stored.

Handling Practices

The Basics

• Clean, dry hands before handling any collectible book
• Support the book from underneath when carrying (never grip by the headcap)
• Open gently — never force a binding flat (especially for tight, never-read copies)
• Pull from the middle of the spine when removing from shelf (never pull by the headcap)
• Work on a clean, padded surface when examining

Photography and Examination

When examining or photographing books for documentation:

• Work in natural light supplemented by soft artificial light
• Use a padded book cradle or folded towel to support open books
• Never place books face-down on hard surfaces
• Handle jackets separately from books when examining condition

The Conservation Hierarchy

Conservation follows a hierarchy from basic maintenance (which every collector should practice) through professional intervention (for valuable items with specific damage):

Level 1: Preventive Care (All Collectors)

• Mylar jacket protectors on all jacketed books
• Proper shelving and climate control
• Regular dusting with soft brush
• Annual condition inspection
• Photography for insurance documentation

Level 2: Basic Intervention (Intermediate Collectors)

• Gently erasing pencil marks with appropriate erasers (only on non-fragile paper)
• Removing loose inserts (bookmarks, receipts) that might cause foxing
• Replacing acidic bookmarks with acid-free alternatives
• Using acid-free tissue to interleave between fragile pages
• Applying rust inhibitor around staples in pamphlets

Level 3: Professional Conservation (Valuable Items)

For books valued above $1,000 with specific damage, professional conservators offer:

Finding a conservator: The American Institute for Conservation (AIC) maintains a directory of qualified book conservators. Always request references and examples of prior work.

The restoration disclosure rule: Any conservation work that materially affects a book’s appearance must be disclosed when selling. “Professionally restored” is a legitimate condition descriptor — “undisclosed restoration” is fraud.

Emergency Procedures

Water Damage

If a book gets wet:

1. Act immediately — mold can begin within 48 hours
2. Blot (don’t rub) excess water with clean, absorbent paper
3. Separate pages with wax paper to prevent sticking
4. Fan the book open and stand it upright to air dry
5. Never use heat (hair dryers, radiators) — heat warps and cracks
6. For valuable items: Place in plastic bag and freeze immediately. Frozen books can be professionally freeze-dried later.

Mold

If you discover mold:

1. Isolate the affected book immediately (mold spreads via spores)
2. Move to a dry, well-ventilated area (mold thrives in humidity above 60%)
3. Do NOT attempt to brush off active mold indoors (spreads spores)
4. For valuable items: Consult a professional conservator. Do not attempt home remedies.

Insect Damage

Common book pests: silverfish, booklice, carpet beetles, woodworm.

• Store books in clean, dry environments (insects prefer humidity)
• Regular inspection (look for frass, exit holes, damaged paper edges)
• For active infestations: isolate affected books, consult pest control specialists
• Preventive: cedar blocks or lavender sachets near shelves (mild deterrent)

Annual Maintenance Checklist

• Inspect all protectors (replace any that have become brittle or yellowed)
• Check climate control (verify temperature and humidity are within range)
• Dust shelves and book tops with soft brush
• Inspect for insect activity (frass, holes, live insects)
• Photograph any valuable recent acquisitions for insurance
• Update inventory spreadsheet with new purchases
• Review insurance coverage against current collection value
• Check for light damage (compare unexposed pages to exposed spine colors)