Climbing holds are primarily made from resin, specifically polyurethane or polyester resin, rather than traditional plastic. While the term “plastic” is often used loosely, the climbing industry favors resin-based composites for their strength, texture, and durability.
Background: The Evolution of Climbing Hold Materials
Climbing holds have undergone significant material changes since indoor climbing walls first appeared in the 1980s. Early holds were carved from wood or cast from concrete, but these materials lacked the versatility and durability climbers desired. The introduction of synthetic materials revolutionized hold manufacturing.
Initially, many holds were made from polyester resin, a type of synthetic resin with good hardness and durability but somewhat brittle under heavy impact. Later, polyurethane resin gained popularity due to its improved toughness and flexibility. These resin materials are sometimes casually called “plastic,” but technically they are thermosetting resins rather than thermoplastics.
What Materials Are Climbing Holds Made Of?
The two main resin materials used in climbing holds are:
- Polyester Resin: This was the first widely used resin for holds. It is rigid, cost-effective, and easy to cast but can be brittle and prone to chipping over time.
- Polyurethane Resin: More common today, polyurethane offers superior durability, elasticity, and resistance to impact. It also allows for more detailed textures and shapes.
Both materials are mixed with fillers and pigments to achieve desired colors and textures. Manufacturers may add sand or other rough materials to improve grip.
While the resin base is synthetic, it is not the same as common household plastics like polyethylene or polypropylene. Resin-based holds are thermosets, meaning they cure into a permanent solid and do not melt or reshape with heat.
How Resin Holds Are Made
Climbing holds are typically produced through a casting process:
- Mold Creation: A master hold is sculpted by hand or digitally designed and then used to create a silicone or rubber mold.
- Resin Mixing: Resin is combined with catalysts, pigments, and fillers to prepare the casting mixture.
- Pouring and Curing: The resin mix is poured into the mold and allowed to cure (harden) over several hours at room temperature or with mild heating.
- Finishing: Once cured, the hold is removed from the mold, any excess material trimmed, and the surface texture refined if needed.
This process allows for consistent production of holds in various shapes, sizes, and textures, enabling climbing gyms to customize routes and difficulty.
Why Resin Over Plastic? The Advantages
Using resin instead of common plastic materials offers several benefits:
- Durability: Resin holds resist cracking and breaking under repeated use and heavy loads better than many plastics.
- Texture: Resin can be textured finely to mimic rock surfaces, providing realistic grip and friction.
- Shape Versatility: Resin casting allows complex, ergonomic shapes that are difficult with injection-molded plastic.
- Weight: Polyurethane resin is lightweight yet strong, making holds easier to install and move.
- Color Customization: Pigments and dyes are easily integrated into resin, allowing vibrant and durable colors.
In contrast, many household plastics lack the strength or surface qualities needed for climbing holds and can be too slippery or brittle.
Common Problems with Resin Climbing Holds
Although resin holds are highly effective, they can have some issues:
- Chipping and Cracking: Polyester resin holds are more prone to chipping, especially if dropped or subjected to sharp impacts.
- UV Degradation: Some resins can degrade or discolor when exposed to sunlight for prolonged periods, which is why most indoor holds fare better outdoors.
- Surface Wear: Over time, the texture may smooth out due to climbers’ repeated use, reducing grip.
- Environmental Concerns: Resin production involves chemicals that are not environmentally friendly, and holds are not biodegradable.
Manufacturers continually improve resin formulas to address these issues, such as adding UV stabilizers or tougher polymer blends.
How to Choose Climbing Holds Based on Material
When selecting climbing holds, understanding the resin type and manufacturing process can help you pick the right holds for your needs:
- For Home Walls: Polyurethane resin holds are recommended for their durability and safety. Avoid cheaper polyester resin holds that may break easily.
- For Commercial Gyms: High-quality polyurethane holds with added fillers for texture and durability are preferred to withstand heavy daily use.
- For Outdoor Use: Look for holds with UV-resistant coatings to prevent degradation.
- Budget Considerations: Polyester resin holds tend to be less expensive but may require more frequent replacement.
Also consider the shape, size, and texture appropriate for your climbing goals, as these factors often matter more than minor material differences.
Comparing Resin Holds to Alternative Materials
Besides resin, climbing holds have been made from other materials, though less commonly today:
- Wooden Holds: Used primarily for training boards and campus boards. They offer a smooth, natural feel but lack texture and variety.
- Concrete Holds: Early holds were cast from concrete but are heavy and brittle, making them impractical now.
- Metal Holds: Rare and mainly used for special grip training. Metal is heavy, can be slippery, and is cold to the touch.
- 3D Printed Holds: Emerging technology uses various plastics or resin-like materials. These can be customized but currently lack the durability of commercial resin holds.
Overall, resin holds remain the industry standard due to their optimum balance of weight, texture, durability, and cost.
Costs of Resin Climbing Holds
The price of climbing holds varies depending on material quality, size, brand, and design complexity. Typical price ranges include:
- Small holds (jugs, crimps): $5–$20 each
- Medium to large holds (slopers, pinches): $15–$40 each
- Sets of multiple holds: $100–$500 or more
Polyurethane resin holds tend to cost more than polyester resin holds due to better performance and durability. Custom or artist-designed holds can be significantly pricier.
Investing in higher-quality resin holds often pays off by lasting longer and providing a better climbing experience.
Safety Considerations for Resin Climbing Holds
Safety is paramount when using climbing holds, and resin materials contribute to this by:
- Structural Integrity: High-quality resin holds are designed to withstand repeated loads without cracking or breaking.
- Surface Texture: Properly textured resin holds reduce slipping risk and improve grip.
- Secure Mounting: Resin holds come with integrated bolt holes or screw holes to ensure firm attachment to walls.
- Maintenance: Regular inspection for cracks or wear is important, as damaged resin holds can fail unexpectedly.
Always purchase climbing holds from reputable manufacturers who test for strength and safety standards.
Frequently Asked Questions
Are climbing holds made of plastic?
While climbing holds are sometimes casually called plastic, they are actually made from synthetic resin materials, mainly polyurethane or polyester resin, which differ chemically and physically from common plastics.
Is polyurethane resin better than polyester resin for climbing holds?
Yes, polyurethane resin is generally preferred because it is more durable, less brittle, and offers better texture and impact resistance compared to polyester resin.
Can resin climbing holds break easily?
High-quality resin holds are designed to be durable and withstand regular use, but lower-quality or polyester resin holds can chip or crack if dropped or subjected to sharp impacts.
Are resin holds safe for children?
Yes, resin holds are safe for children when properly installed and maintained. Their textured surfaces provide good grip, but supervision is recommended during climbing.
Can climbing holds be recycled?
Most resin climbing holds are thermoset plastics, meaning they cannot be melted down and recycled easily. Disposal options are limited, which is an environmental consideration.
Do resin holds work outdoors?
Polyurethane resin holds can be used outdoors but should have UV-resistant coatings to prevent fading and degradation from sun exposure.
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